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Preliminary Information This document contains information on a new product. The parametric information, although not fully characterized, is the result of testing initial devices.
M02069 3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
The M02069 is a highly integrated, programmable VCSEL driver intended for SFP/SFF modules to 4.3 Gbps. Using differential PECL data inputs, the M02069 supplies the bias and modulation current required to drive a VCSEL or edge-emitting laser. The modulation output can be AC or DC-coupled to a FP laser diode or AC coupled to a common anode or common cathode VCSEL Peaking adjustment is available to improve VCSEL fall time. EPON burst mode operation is supported with no extra components. Integrated safety circuitry detects faults and provides latched bias and modulation current shutdown.
Applications
* EPON FTTH modules * Gigabit Ethernet modules * 1G/2G/4G Fibre Channel modules
Features
* High speed operation; suitable for SFP/SFF applications from 155Mbps to 4.3 Gbps. * Supports Common Anode VCSEL, Common Cathode VCSEL, or FP LASER. May be used with or without a monitor photodiode. * Programmable temperature compensation. Modulation output and bias output can be controlled using the programmable module controller M02080 or a few discrete resistors. * Supports DDMI (SFF-8472) diagnostics. * DC or AC coupled modulation drive. * Peaking circuit to optimize VCSEL response. * Low overshoot allows high extinction ratio with low jitter. * Supports E-PON burst mode with no extra components * Automatic Laser Power Control, with "Slow-Start". * 3.3V or 5V operation
Preliminary Information
Functional Block Diagram
PEAKADJ
VCC3
GND
VCC
Internal 3.3V reg. DIN + DIN-
Internal Power Bus
SV CC and IBOUT_CC OUTOutput Buf f er Laser Driv er
Input Buf f er
OUT+ GND 0
V CC3 -1.3V
IB OUT_CA and SGND IPIN
TX Disable
Saf ety Circuitry with Latched Fault
Modulation Control
Automatic Power Control (laser bias current)
CC SEL
VCC3SEL
APCSET
DISDLY
FAIL
DIS
SLOPE
SET
RESET
BIASMO N
02069-DSH-001-C
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TxPwrMO N
MO D
MOD
TC
CAPC
MO N
February 2004
M02069 Data Sheet
Ordering Information
Part Number
M02069-11 M02069-EVM
Package
QFN24 Combination Electrical and Optical Evaluation board
Operating Temperature
Revision History
Revision
A B
Level
Advance Advance Preliminary
Date
October 2003 November 2003 February 2004
ASIC Revision
x x x Initial Release. Revision B Release. Revision C Release, Preliminary.
Description
Preliminary Information
ii
C
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02069-DSH-001-C
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Preliminary Information
1.0
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 1.2 1.3 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.3.1 Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.3.2 Internal Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.3.3 Common Cathode/Common Anode Configuration Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.3.4 Bias Current Generator and Automatic Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.3.5 Data Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.3.6 Peak Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.3.7 Modulation Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 1.3.8 Modulator (Figure 1-2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 1.3.9 Fail Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 1.3.10 TX Disable and Disable Delay Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 1.3.11 Burst Mode Operation (Figure 1-3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 1.3.12 Current Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Laser Eye Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 1.4.1 Safety Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Fault Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Pin Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
1.4 1.5 1.6 1.7
2.0
Product Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.1 2.2 2.3 2.4 2.5 2.6 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Safety Logic Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Package Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 2.6.1 Mechanical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 2.6.1.1 Package Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
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2.7 2.8
2.9
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Manufactureability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.8.1 Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.8.2 Peak Reflow Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.8.3 Moisture Sensitivity Level (MSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.9.1 Component Placement and Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.9.2 Routing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 2.9.3 Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Preliminary Information
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02069-DSH-001-C
List of Figures
Figure 1-1. Figure 1-2. Figure 1-3. Figure 1-4. Figure 1-5. Figure 1-6. Figure 1-7. Figure 1-8. Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4.
M02069 Block Diagram Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Modulator Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 DIS and DISLY Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Safety Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Application Diagram, Common Anode VCSEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Application Diagram, Common Cathode VCSEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Application Diagram, Common Cathode VCSEL w/o Monitor Diode . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Application Diagram, Common Anode FP Laser, DC Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Safety Logic Timing Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 Relationship Between Data Inputs and Modulation Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 QFN24 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 Pin Assignments for M02069 Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Preliminary Information
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M02069 Data Sheet
Preliminary Information
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List of Tables
Table 1-1. Table 1-2. Table 1-3. Table 1-4. Table 2-1. Table 2-2. Table 2-3. Table 2-4. Table 2-5.
Pin Connection for 3.3V and 5V VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Pin Connection for Common Anode and Common Cathode Laser Modes . . . . . . . . . . . . . . . . . . . . . . .5 Circuit Response to Single-Point Fault Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Pin Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 AC Characteristics - Logic Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Safety Logic Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Preliminary Information
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M02069 Data Sheet
Preliminary Information
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02069-DSH-001-C
1.0 Functional Description
1.1
Overview
The M02069 is a highly integrated laser driver intended for applications to 4.3 Gbps. Many features are user-adjustable, including common anode or common cathode laser mode, the APC (automatic power control) loop bias control (via a monitor photodiode), modulation current, temperature compensation control of modulation current, and peaking adjustment. The part may be operated from a 3.3V or 5V supply. For E-PON and other burst-mode applications, the part supports fast and accurate turn-on and turn-off of the laser bias and modulation currents. Safety circuitry is also included to provide a latched shut-down of laser bias and modulation current if a fault condition occurs. An internal VCC switch provides redundant shutdown when operating the device in common anode configuration. An internal ground switch provides redundant shutdown when operating the device in common cathode configuration. Modulation, bias, and transmit power monitor current mirrors are provided for DDMI applications and allow monitoring without disturbing the analog signal path.
Preliminary Information
02069-DSH-001-C
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M02069 Data Sheet
Figure 1-1.
M02069 Block Diagram Example
PEAKADJ
V CC3
GND
V CC
Internal 3.3V reg. DIN + DIN-
Internal Power Bus
SV CC and IBOUT_CC OUTOutput Buf f er Laser Driv er
Input Buf f er
OUT+ GND 0
V CC3 -1.3V
IB OUT_CA and SGND IPIN
Preliminary Information
2
TX Disable
Saf ety Circuitry with Latched Fault
Modulation Control
Automatic Power Control (laser bias current)
CC SEL
MOD SET
VCC3SEL
TCSLOPE
APCSET
DISDLY
FAIL
DIS
RESET
MODMON
BIASMON
Mindspeed TechnologiesTM
Preliminary Information/Mindspeed Proprietary and Confidential
TxPwrMON
CAPC
02069-DSH-001-C
Functional Description
1.2
* * * * * * * * * *
Features
High speed operation; suitable for SFP/SFF applications from 155Mbps to 4.3 Gbps. Supports Common Anode VCSEL, Common Cathode VCSEL, or FP LASER. May be used with or without a monitor photodiode. Programmable temperature compensation. Modulation output and bias output can be controlled using the programmable module controller M02080 or a few discrete resistors. Supports DDMI (SFF-8472) diagnostics. DC or AC coupled modulation drive. Peaking circuit to optimize VCSEL response. Low overshoot allows high extinction ratio with low jitter. Supports E-PON burst mode with no extra components Automatic Laser Power Control, with "Slow-Start". 3.3V or 5V operation
1.3
1.3.1
General Description
Detailed Description
Preliminary Information
The M02069 laser driver consists of the following circuitry: an internal regulator, common anode/common cathode configuration control, bias current generator and automatic power control, data inputs, peaking adjust, modulation current control, modulator output, laser fail indication, disable control, and monitor outputs for the bias current, modulation current, and transmitted power.
1.3.2
Internal Regulator
The M02069 contains an internal 3.3V regulator so high bit rate performance can be achieved with 5V or 3.3V power supply. When operating from a 5V supply (VCC is connected to +5V), an internal regulator provides a voltage of approximately 3.3V to the majority of the on-chip circuitry. The on-chip regulator is internally compensated, requiring no external components. When a 3.3V supply is used (VCC and VCC3 connected to 3.3V) the regulator is switched off and the internal circuitry is powered directly through the VCC3 supply pin. The decision as to whether or not the internal regulator is required is made via the VCC3SEL pin, which also determines whether the safety circuitry needs to monitor for proper +5V supply voltage. SVCC is sourced from VCC3 through a switch for common anode applications (this pin becomes IBOUT_CC in common cathode applications). When a fault condition is present, FAIL will assert and the switch sourcing SVCC will open so no current can pass through the laser. SVCC does not need any external capacitance, if capacitance to ground is added at SVCC it should be less than or equal to 100pF.
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M02069 Data Sheet
VCC and VCC3 status are internally monitored by the M02069 during power-up and normal operation. During power-up the "slow-start" circuitry requires that VCC and VCC3 each reach an acceptable level before enabling bias or modulation current. Table 1-1. Pin Connection for 3.3V and 5V VCC
Pin Connection For: VCC = 3.3V Pins Dependent on VCC Voltage VCC3 (pin 21) CAPC (pin 20) PEAKADJ (pin 22) VCC3SEL (pin 4)
Connect to VCC
VCC = 5V
Reference for CAPC and PEAKADJ
Capacitor between CAPC and VCC3 or VCC Capacitor between CAPC and VCC3 (not VCC)
Connect to VCC3 or VCC to disable
Connect to VCC3 to disable (not VCC)
Connect to VCC3 or VCC
Connect to GND
Preliminary Information
1.3.3
Common Cathode/Common Anode Configuration Control
When CCSEL is programmed high, the M02069 is configured for common cathode lasers. When CCSEL is low, the M02069 is configured for common anode lasers. The state of the CCSEL pin determines: 1. 2. 3. 4. whether bias current is sourced or sunk whether monitor photodiode current is sunk or sourced whether internal termination resistors at OUT+ and OUT- are active whether the redundant safety switch disconnects VCC or GND from the output circuitry.
The affected pins are OUT+, OUT-, SVCC/IBOUTCC, and SGND/IBOUTCA. The Table 1-2 below shows the configuration of each pin for the 2 states of CCSEL.
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02069-DSH-001-C
Functional Description
Table 1-2.
Pin Connection for Common Anode and Common Cathode Laser Modes
Pin Connection When: CCSEL = High SVCC Pin 18 IBOUTCC SGND Pin 14 IBOUTCA Pin 13 Pin 22 IPIN PEAKADJ
Inactive Laser bias source current. Also add 1.5k ohm to ground at this pin for correct safety logic power-up timing. Ground for laser and all output load components Inactive Monitor photodiode source current Controls Negative going edge of OUTActive
CCSEL = Low
Supply for laser and all output load components. Inactive
Pins Dependent on CCSEL Setting
Inactive Laser bias sink current. Monitor photodiode sink current
Preliminary Information
Controls Negative going edge of OUT-, (do not use) Inactive
Internal 50 pull-up resistors on OUT+ and OUTRatio of Bias current to BIASMON current Ratio of Modulation current to MODMON current
15:1
50:1
30:1
65:1
1.3.4
Bias Current Generator and Automatic Power Control
The M02069 can either source or sink bias current for the laser diode depending on whether it is in common anode or common cathode mode. In common cathode mode (CCSEL high) IBOUTCC will source current. In common anode mode (CCSEL low) IBOUTCA will sink current. Regardless of whether the M02069 is configured for common anode or common cathode mode, the following information applies. To maintain constant average optical power, the M02069 incorporates a control loop to compensate for the changes in laser threshold current over temperature and lifetime. The bias current will be determined by the value of the external resistor RAPCSET and the transfer efficiency between the laser and monitor photodiode. The photo current from the monitor photodiode mounted in the laser package is sunk or sourced at IPIN. This photo current is mirrored and an equivalent current is sourced from pins TxPwrMON and APCSET. The APC loop adjusts the laser bias current (hence the monitor diode photo current) to maintain a voltage of 1.3V at APCSET. RAPCSET * IPIN = 1.3 V The APC loop has a time constant determined by CAPC, RAPCSET and the transfer efficiency between the laser and monitor photodiode. The larger the CAPC capacitor the lower the bandwidth of the loop and the larger the RAPCSET resistor the lower the bandwidth of the loop.
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M02069 Data Sheet
In general, it is recommended that at least 2.2 nF of external capacitance be added externally between CAPC and VCC3 to assure loop stability. With use of a 2.2 nF capacitor, the bias current can reach 90% of its final value within 1 millisecond. In Common Anode mode with a 2.2nF CAPC capacitor the APC loop bandwidth is less than 30 kHz for almost all combinations of RAPCSET and transfer efficiency., which should be adequate for bit rates of 155Mbps. (and all higher bit rates). In Common Cathode mode with a 2.2nF CAPC capacitor the APC loop bandwidth will be slightly higher, but should be less than 40 kHz for almost all combinations of RAPCSET and transfer efficiency. Contact the factory with your specific values of CAPC, RAPCSET, and transfer efficiency to determine the maximum APC loop bandwidth in your application. The bias generator also includes a bias current monitor mirror (BIASMON), whose output current is typically 1/50th of the bias current in common anode mode (CCSEL = low) or 1/15th of the bias current in common cathode mode (CCSEL = high). This pin can be connected directly to an M02080 DDMI module controller or through a resistor to ground. If this function is not needed this pin can be left open. The M02069 can be used without a monitor photodiode by connecting BIASMON to APCSET (see Fig. 4). In this case the M02069 will increase the bias current (hence the BIASMON current) to the laser until the voltage at APCSET is approximately 1.3V.
Preliminary Information
1.3.5
Data Inputs
The inputs to the data buffers are self-biased through 4 k resistors to an internal voltage VTT which is approximately VCC3 - 1.3V. Both CML and PECL inputs signals can be AC coupled to the M02069, or in 3.3V applications PECL inputs can be DC coupled to the data inputs. In most applications the data inputs are AC coupled with controlled impedance pcb traces which will need to be terminated externally with a 100 or 150 resistor between the + and - inputs.
1.3.6
Peak Adjust
Some VCSELs do not turn off quickly without peaking the negative going edge. In common cathode applications, peaking on this edge can be added with a resistor connected between the PEAKADJ input and GND. The amount of peaking is approximately Peaking current = 5 * (1.3V / 2 K + resistance to ground). The resistance to ground should be between 2 K and 20 K. (Which will result in a peaking currents from 2.6mA to 260 A.) Peaking control can be disabled by connecting PEAKADJ to VCC3, resulting in no peaking current and reducing supply current by approximately 2 mA. In common anode configuration the PEAKADJ pin should be connected to VCC3. Note: Unlike the rest of the signal currents in the M02069, the output Peak Adjust current is unbalanced (singlesided drive). The designer should be aware that the use of peaking may result in unwanted EMI emissions. If EMI problems are traced to the use of peaking, high frequency decoupling (10pF capacitor or smaller) may be needed on the VCC line.
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Functional Description
1.3.7
Modulation Control
There are 2 programmable control lines for controlling the modulation current and its temperature compensation. These inputs can be programmed simply with a resistor to ground or they can be digitally controlled by the Mindspeed module controller M02080. The modulation current amplitude is controlled by the MODSET input pin. The modulation current is temperature compensated by the TCSLOPE input. If the temperature compensation at TCSLOPE is disabled, the modulation output current is simply: IOUT = 42 x (1.28V / RMODSET) when CCSEL is low and IOUT = 22 x (1.28V / RMODSET) when CCSEL is high and a 50 VCSEL is used. Where RMODSET is the resistance from pin MODSET to ground. To temperature compensate the modulation current, choose RTCSLOPE to meet the following relationship:
RTCSLOPE = 19.5*(TC)-1.5, where TC is the desired slope of the modulation current from 25C to 85C in%/C and RTCSLOPE is in k. If no temperature compensation is desired, leave RTCSLOPE open. In any case, RTCSLOPE will have negligible effect at M02069 case temperatures below 10C.
For example: Given a common cathode VCSEL with a desired modulation current at low temperatures of 10mA and a temperature coefficient of -0.5%/C at high temperatures (which will require a laser driver temperature coefficient of +0.5%). Choose RMODSET = 22 x (1.28V / 10mA) = 2.8k. Choose RTCSLOPE =19.5*(0.5)-1.5 k = 55k.
Preliminary Information
1.3.8
Modulator (Figure 1-2)
The output stages OUT+ and OUT- are designed to drive 25 output loads over a wide range of currents and circuit architectures. The VCSEL may be a common anode or common cathode device. The output can be AC, DC, or Differentially coupled depending on the supply voltage and laser configuration. In a common anode configuration with a VCSEL (Figure 1-5), OUT+ should be connected through a capacitor to the VCSEL. A pull-up resistor should be added in parallel to the VCSEL from SVCC to the OUT+ output. The dynamic impedance of the parallel combination of the VCSEL and pull-up resistor should be roughly 25 ohms. A 24 ohm pull-up resistor should also be added from SVCC to OUT- so the currents and voltage swings in the two outputs are balanced. In a common anode configuration with a Fabry-Perot laser (Figure 1-8), OUT+ may be AC, DC, or Differentially coupled to the laser cathode. A resistor should be added in series with the laser such that the dynamic impedance of the series combination of the laser and resistor should be roughly 25 ohms. A 24 ohm pull-up resistor to SVCC is needed on the OUT- output. For common cathode operation with a VCSEL (Figure 1-6), internal 50 ohm terminations are switched in between the OUT+ and OUT- outputs and VCC3. VCSELs with impedances from 25-75 can be simply AC coupled to the OUT- output with no additional load matching resistors. In this case OUT+ should be AC coupled to ground through 50. The VCSEL driver output stage is separately grounded from the rest of the circuitry (through GND0). At higher data rates (above 2Gb/s) GND0 may be connected to ground through a minimum of 2 nH of inductance to improve the
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M02069 Data Sheet
transient response. A ferrite can also provide the extra isolation (Murata BLM18HG471SN1 or equivalent recommended). Figure 1-2. Modulator Output
0.75 nH
*
OUT-
0.4pF
0.75 nH
*
OUT+
OUT+ and OUT- should not be driven below 0.7V
GND 0 (optional external inductance) * Denotes bond wire internal to MLF package
Preliminary Information
1.3.9
Fail Output
The M02069 has a FAIL alarm output which is compatible with the TX_FAULT signalling requirements of common pluggable module standards. The ESD protection on this pin provides a true open collector output that can withstand significant variation in VCC when signalling between circuit boards. Also, if the M02069 loses power the FAIL output will signal a fail condition. In a simple static protection scheme used by other ICs the protection diodes would clamp the FAIL signal to ground when the chip loses power.
1.3.10
TX Disable and Disable Delay Control
The DIS pin is used to disable the transmit signal. When the transmit is disabled both the bias and modulation currents are off. The DIS input is compatible with TTL levels regardless of whether VCC = 5V or VCC = 3.3V. In most module applications a pull-up resistor to VCC between 4.7k and 10k is required. Because this pin has an internal 7k resistor to VCC, no external pull-up resistor is required. The DISDLY pin is used in conjunction with the DIS pin to control bias current enable time. (The modulation current enable time is always less than 600 ns). Unless the DISDLY pin is programmed for burst mode, the APC loop enable time will be slow (less than 1 ms with a CAPC = 2.2nF). When a capacitor C is added to the DISDLY pin, the slow-start circuitry is disabled for typically T = 3 * 106 (sec/F)* C (F) following the DIS high transition. If DIS transitions low during this time, the bias current will quickly return to within 90% of its final value (within less than 500ns). If DIS transitions low after this time the slow-start circuitry will engage and the bias current will not return to its final value for approximately 1ms (depending on the CAPC capacitor).
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Functional Description
1.3.11
Burst Mode Operation (Figure 1-3)
The M02069 will meet the timing requirements of EPON with the addition of a capacitor at DISDLY (see paragraph above and Figure 1-3). As shown in Figure 1-8, the laser should be DC coupled to OUT+. VCC may be 3.3V or 5V. If the M02069 is to be used in an APON or GPON application, external switches will be needed to satisfy the timing requirements. (See Mindspeed application note 0206X-APP-001.)
Preliminary Information
02069-DSH-001-C
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M02069 Data Sheet
Figure 1-3.
DIS and DISLY Timing
EPON Burst Mode Operation
DIS
DISDLY
IBIASOUT
Preliminary Information
10
OUT+ t_off < 500ns BM t_onBM < 500ns forMOD > 10mA I
Normal Operation, (slow-start whenever part enabled)
DIS
DISDLY t_on< 1ms, depending on C APC IBIASOUT
OUT+ t_off< 10s
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Functional Description
1.3.12
Current Monitors
To facilitate complying with laser safety and DDMI1 requirements, output monitors are provided for transmit power (TxPwrMON), bias (BIASMON), and modulation current (MODMON). These outputs will source current proportional to the emitted optical power (TxPwrMON) the bias current (BIASMON) and modulation current (MODMON). These outputs may be connected directly to the corresponding pins on the M02080 module controller. To use these pins without an M02080 they should be terminated with a resistor to ground that sets the desired fullscale voltage (not to exceed 2.5V). If the outputs of these monitors are not needed, TxPwrMON, BIASMON, and MODMON can all be left floating and the chip current consumption will be reduced by the value of the monitor currents. Figure 1-4.
C MPC MODSET OUTP IBOUT_CA or IBOUT_CC FAULT_OK
Safety Circuit Block Diagram
Preliminary Information
SET
Q
DIS
SR LATCH _ RST Q FAIL
ENA
VCC3 _OK BIAS_OK
START
VCC5 _OK VCC3SEL
SET
Q
ONE-SHOT RESET RESET
OPTIONAL EXTERNAL CAPACITOR TO EXTEND INITIALIZATION PERIOD
PULSE
SR LATCH _ RST Q
DISABLE: MODULATION CURRENT BIAS CURRENT SVCC or SGND
3 ms + T opt_cap
1.4
Laser Eye Safety
Using this laser driver in the manner described herein does not ensure that the resulting laser transmitter complies with established standards such as IEC 825. Users must take the necessary precautions to ensure that eye safety and other applicable standards are met. Note that determining and implementing the level of fault tolerance required by the applications that this part is going into is the responsibility of the transmitter designer and manufacturer since the application of this device cannot be controlled by Mindspeed.
1
Digital Diagnostic Monitoring Interface for Optical Tranceivers, defined in SFF-8472.
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M02069 Data Sheet
1.4.1
Safety Circuitry
Safety Circuitry in the M02069 will disable the modulation and bias current and assert the FAIL output immediately upon detecting a fault condition. In addition, the supply voltage that sources or sinks the laser current (SVCC or SGND) will immediately go open circuit and prevent any current from passing through the laser. Fault conditions checked by the M02069 include shorts to ground or VCC of all pins which can increase the laser modulation or bias current. For an initialization or power-up sequence to be successful, all the fault detection monitors must signal that the chip is "healthy". When DIS goes low, pins are checked for shorts to ground or VCC and a FAIL condition is latched if there is a fault. If the state of the pins is OK, a one-shot at the reset pin begins a countdown which will latch a FAIL condition if the bias current has not stabilized to an acceptable level during the one-shot time. The one-shot can be extended with an external capacitor connected from the RESET pin to ground. The one-shot1 width is approximately TONE-SHOT = 3 ms + (0.3 ms/pF)x(external capacitance).
Preliminary Information
1.5
Fault Conditions
This section describes the M02069 operating modes during fault conditions. Over voltage, under voltage, pins shorted to VCC and pins shorted to ground are included in the fault Table 1-3. Table 1-3.
Pin Name
VCC
Circuit Response to Single-Point Fault Conditions
Circuit Response to Over-voltage Condition or Short to VCC
Bias and modulation outputs are disabled once VCC rises above the supply detection (high voltage) threshold (see Table 2-3)
Circuit Response to Under-Voltage Condition or Short to Ground
Bias and modulation outputs are disabled once VCC drops below the supply detection (low voltage) threshold
DIN+, DIN-
The APC loop will attempt to compensate for the change in The APC loop will attempt to compensate for the change in output power. If the APC loop can not maintain the set average output power. If the APC loop can not maintain the set average power, a fault state occurs.(1,2,3) power, a fault state occurs.(1,2,3) Does not affect laser power. Bias and modulation outputs are disabled. SVCC is opened when CCSEL is low or floating (or SGND is opened when CCSEL is high) Does not affect laser power. Does not affect laser power. Does not affect laser power. Does not affect laser power. Does not affect laser power. A fault state occurs.
(1)
VCC3SEL DIS
Does not affect laser power. Does not affect laser power (normal condition for circuit operation). Does not affect laser power. Does not affect laser power. Does not affect laser power. Does not affect laser power. Does not affect laser power. A fault state occurs.(1) A fault state occurs.(1) A fault state occurs.(1)
FAIL RESET MODMON BIASMON TxPWRMON APCSET IPIN IBOUTCA(3)
A fault state occurs.(1) The laser will be turned off, then a fault state occurs.(1)
1.The one-shot is actually comprised of an oscillator and 10-bit counter.
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Functional Description
Table 1-3.
Pin Name
IBOUTCC(4) OUT+(3)
Circuit Response to Single-Point Fault Conditions
Circuit Response to Over-voltage Condition or Short to VCC
A fault state occurs.(1) Laser modulation is prevented; the APC loop will increase the bias current to compensate for the drop in laser power if it is DC coupled. If the set output power can not be obtained, a fault state occurs.(1,2) Does not affect laser power during common cathode operation because output is AC coupled. Does not affect laser power.
Circuit Response to Under-Voltage Condition or Short to Ground
The laser will be turned off, then a fault state occurs.(1) A fault state occurs.(1)
OUT-(4) SVCC(3) CAPC VCC3 PEAKADJ CCSEL
Does not affect laser power during common cathode operation because output is AC coupled. Laser bias current will be shut off and a fault state occurs.(1)
Laser bias current will be shut off, then a fault state occurs.(1) A fault state occurs.(1) Bias and modulation outputs are disabled once VCC3 rises above the supply detection (high voltage) threshold Does not affect laser power. Normal operation for common cathode configuration. If the M02069 is configured for common anode drive, a fault state will occur.(1) Bias and modulation outputs are disabled once VCC3 drops below the supply detection (low voltage) threshold Does not affect laser power Normal operation for common anode configuration. If the M02069 is configured for common cathode drive, a fault state will occur.(1)
Preliminary Information
MODSET
When the laser is DC coupled in common anode configuration, A fault state occurs.(1) the APC loop will attempt to compensate for the drop in output power. If the APC loop can not maintain the set average power, a fault state occurs.(1,2) Does not affect laser power. When the laser is DC coupled in common anode configuration, the APC loop will attempt to compensate for any change in output power. If the APC loop can not maintain the set average power, a fault state occurs.(1,2) Does not affect laser power.
TCSLOPE
DISDLY
Does not affect laser power.
Notes: 1. A fault state will assert the FAIL output, disable bias and modulation outputs and will either open the switch at SVCC (CCSEL=high) or SGND (CCSEL=low). 2. Does not affect laser power when the output is AC coupled to the laser. 3. Does not affect laser power during common cathode operation. 4. Does not affect laser power during common anode operation.
1.6
* * *
Applications
EPON FTTH modules Gigabit Ethernet modules 1G/2G/4G Fibre Channel modules
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M02069 Data Sheet
Figure 1-5.
Application Diagram, Common Anode VCSEL
V CC V CC VCC3 PEAKADJ Internal Power Bus V CC3
DIN +
Internal 3.3V reg.
SVCC OUT-
Input Buf f er DIN VCC3 -1.3V
Output Buf f er
Laser Driv er
OUT+ GND0
IBOUT_CA IPIN
TX Disable
Saf ety Circuitry with Latched Fault
Modulation Control
Automatic Power Control (laser bias current)
CC SEL
VCC3SEL
MOD MON
BIASMON
TxPwrMON
DISDLY
FAIL
DIS
RESET
TCSLOPE
MOD SET
Connect to VCC when V CC =3.3V Connect toGND when V CC = 5V
APCSET
V CC3
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CAPC
Preliminary Information
VCC3SEL
MODSET
APCSET
DISDLY
FAIL
DIS
TCSLOPE
MODMON
BIASMON
RESET
TxPwrMON
CAPC
Connect to V CC when V CC = 3.3V Connect to GND when V CC = 5V
For V CC=3.3V, tie V CC3 to V CC.
VCC3
Figure 1-6.
Application Diagram, Common Cathode VCSEL
PEAK ADJ V CC VCC VCC3 V CC3 Internal Power Bus OUT+ Input Buf f er Output Buf f er Laser Driv er OUTGND 0 VCC3 -1.3V
Internal 3.3V reg.
DIN+ DIN-
IBOUT_CC 1.5K SGND IPIN V CC
TX Disable
Saf ety Circuitry with LatchedFault
Modulation Control
Automatic Power Control (laser bias current)
CCSEL
For V CC=3.3V, tie V CC3 to V CC.
02069-DSH-001-C
Functional Description
Figure 1-7.
Application Diagram, Common Cathode VCSEL w/o Monitor Diode
PEAKADJ V CC V CC V CC3 V CC3 Internal Power Bus OUT+ Input Buf f er Output Buf f er Laser Driv er OUTGND0 V CC3 -1.3V
Internal 3.3V reg.
DIN+ DIN-
IBOUT_CC 1.5K SGND IPIN V CC3
TX Disable
Saf ety Circuitry with LatchedFault
Modulation Control
Automatic Power Control (laser bias current)
CCSEL
Preliminary Information
VCC3 SEL
MODMON
BIASMON
TxPwrMON
DISDLY
FAIL
TCSLOPE
DIS
RESET
MODSET
Connect to V CC when V CC =3.3V Connect toGND when V CC = 5V
APCSET
V CC3
Figure 1-8.
Application Diagram, Common Anode FP Laser, DC Coupling
V CC V CC V CC3 PEAK ADJ V CC3
DIN +
Internal 3.3V reg.
Internal Power Bus
CAPC
For V CC=3.3V, tie V CC3 to V CC.
SV CC OUT-
Input Buf f er DIN V CC3 -1.3V
Output Buf f er
Laser Driv er
OUT+ GND 0
IBOUT_CA
IPIN
TX Disable
Saf ety Circuitry with Latched Fault
Modulation Control
Automatic Power Control (laser bias current)
CC SEL
VCC3SEL
MODSET
APCSET
DISDLY
FAIL
DIS
TCSLOPE
MODMON
BIASMON
TxPwrMON
CAPC
Connect to V CC when V CC = 3.3V Connect to GND when V CC = 5V
For V CC=3.3V, tie V CC3 to V CC. For EPON operation, add a capacitor to GND at DISDLY.
V CC3
RESET
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M02069 Data Sheet
1.7
Table 1-4.
Pin Number 1
Pin Definitions
Pin Definitions
Pin Name VCC
VC C VCC3 VCC3-1.3V
Pin equivalent load
Power supply, 5V or 3.3V.
Function
Positive data input. Self biased. Compatible with AC coupled PECL, AC coupled CML, and DC-coupled PECL (when VCC = 3.3V). When DIN+ is high, OUT+ will sink current.
D +, D IN IN
4k
Preliminary Information
16
2
DIN+
3
DIN-
See DIN+ drawing
VCC VCC3
Negative data input. Self biased Compatible with AC coupled PECL, AC coupled CML, and DC-coupled PECL (when VCC = 3.3V). 3.3V VCC Select. Connect to VCC for VCC = 3.3V operation. Connect to GND for VCC = 5V operation.
4
VCC3SEL
VCC3 SEL 190 72 k
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Functional Description
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Bias and modulation output disable (TTL/CMOS). When high or left floating, the bias and modulation outputs are disabled. Set low for normal operation.
VC C VCC3
7 k DIS
5
DIS
80 k
Preliminary Information
VCC
Safety circuit fault output (TTL/CMOS). Goes high when a safety logic fault is detected. This output will also be high when DIS is high. Requires an external pull-up.
FAIL
6
FAIL
V
CC
VCC3
Safety circuit reset. Leave open for normal operation or add a capacitor to ground to extend the reset time. Connect to GND to disable window comparators at APCSET
7
RESET
RESET 190
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M02069 Data Sheet
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Disable delay control. Connect to ground for normal operation. In burst mode operation add a capacitor from this pin to ground to set the maximum disable time. Disable times greater than this maximum will engage the "slow-start" circuitry.
VCC
8
DISDLY
DISDLY 190
Preliminary Information
18
V CC
VCC3
Modulation Current Monitor. Connect to the corresponding pin on the M02080 or through a resistor to GND. The current through this pin is typically 1/50th of the MODULATION current to the laser when CCSEL is low or 1/25th the MODULATION current when CCSEL is high. This pin may be left open if the feature is not needed and the M02069 current consumption will be reduced by 0.5mA typically.
MOD MON
9
MODMON
190
10
BIASMON
See MODMON drawing
Bias Current Monitor. Connect to the corresponding pin on the M02080 or through a resistor to GND. The current through this pin is typically: 1/50th of the BIAS current to the laser when CCSEL is low 1/15th of the BIAS current to the laser when CCSEL is high This pin may be left open if the feature is not needed and the M02069 current consumption will be reduced by 0.5mA typically.
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Functional Description
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Transmit Power Monitor. Connect to the corresponding pin on the M02080 or through a resistor to GND. The current through this pin is approximately the same as the photodiode current into IPIN. The current out of this pin is low pass filtered (no external filtering required). This pin may be left open if the feature is not needed and the M02069 current consumption will be reduced by the IPIN current.
VCC
VCC3
TxPwr MON
11
TxPwrMON
33
Preliminary Information
V CC
VCC3
Average Power Control, laser bias current adjustment. Connect to the corresponding pin on the M02080 or to a resistor between this pin and ground to set the bias current to the laser. The APC loop will adjust the laser bias current to maintain a voltage at APCSET of approximately 1.3V. The current sourced from this pin is approximately the same as the current into IPIN.
12
APCSET
APCSET
V
C C
VCC3
For CCSEL low - Current input from monitor photodiode anode. The APC loop will adjust the laser bias current to maintain a voltage at APCSET of approximately 1.3V and at this pin of approximately one VGS. For CCSEL high - Current source for monitor photodiode cathode. The APC loop will adjust the laser bias current to maintain a voltage at APCSET of approximately 1.3V and at this pin of approximately one VGS below VCC3.
IPIN
13
IPIN
33
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M02069 Data Sheet
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Laser bias current output for common anode lasers (CCSEL must be low). Connect directly to laser cathode or at higher bit rates through a ferrite or a resistor to isolate the capacitance of this pin from the modulation drive, (~ 6pF). Maintain a voltage at least 0.7V above GND at this pin
VC C
IBOUTCA (CCSEL = low)
IBOUT CA
Preliminary Information
20
14
VC C
Switched ground connection for common cathode lasers (CCSEL must be high). Provides redundant shutdown during a disable or fault condition. This switch is disabled during common anode operation.
SGND (CCSEL = high)
SGND
V
CC
Ground for output stage. May be connected directly to circuit board ground. At high bit rates (>2Gb/s) an optional inductor or ferrite may be added to reduce switching transients.
15
GNDO
GND0
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Functional Description
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Positive modulation current output (AC or DC coupled to cathode of laser in common anode designs). Sinks current when DIN+ is HIGH. Maintain a voltage > 0.7V at this pin.
V
CC
16
OUT+
OUT+
GND 0
Preliminary Information
17
OUT-
See OUT+ drawing
Negative modulation current output (AC coupled to anode of laser in common cathode designs). Sinks current when DIN- is HIGH Maintain a voltage > 0.7V at this pin. Switched VCC. Supplies laser current for common anode designs. (CCSEL must be LOW). Provides redundant shutdown during a disable or fault condition. This switch is disabled during common cathode operation.
VC C
VCC3
SVCC (CCSEL = low)
SV CC
18
VC C VCC3
IBOUTCC (CCSEL = high)
IBOUTCC
Laser bias current output for common cathode laser designs (CCSEL must be high). Connect directly to laser anode or at higher bit rates through a ferrite or a resistor to isolate the capacitance of this pin from the modulation drive. Maintain a voltage of < 2.5V at this pin. In common cathode applications, also add 1.5k ohm to ground at this pin for correct safety logic power-up timing.
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M02069 Data Sheet
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Laser select input. When high, common cathode operation is selected; IBOUTCC and SGND are functional and internal 50 output terminations are switched in at the modulation outputs OUT+ and OUT-. When low or floating, common anode operation is selected; IBOUTCA and SVCC are functional and the 50 internal termination resistors at OUT+ and OUT- are disconnected.
VCC
V CC3
19
CCSEL
CC SEL 24 k 48 k
Preliminary Information
22
VCC
Automatic power control loop dominant pole capacitor. (Connect a capacitor between this pin and VCC3.) A nominal capacitance of 2.2nF will give a bias current enable time of less than 1 ms.
20
CAPC
C APC 100
VC C
VC C
3.3V applications - Power supply input. Connect to VCC. 5V applications - Do not connect to 5V. Internally generated 3.3V power supply output. Do not attach to non-M02069 circuitry.
21
VCC3
VCC3
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Functional Description
Table 1-4.
Pin Number
Pin Definitions
Pin Name Pin equivalent load Function
Peaking adjustment input. A resistor (2k to 20k) between this pin and ground sets the amount of peaking current on OUT- to improve the fall time of the laser output. The peaking current is approximately (5 * (1.3V / 2 k + resistance to ground)). Connect to VCC3 to disable peaking control.
+ -
V
C C
VCC3
1.28V
22
PEAKADJ
PEAKADJ 1.8 k
Preliminary Information
V
C C
VCC3
Modulation current control. Connect a resistor to ground to set the modulation current.
23
MODSET
MODSET 190
+ -
1.28V
24 CENTER PAD
TCSLOPE
See MODSET drawing
Modulation current temperature compensation slope adjustment. Connect a resistor to ground to set the temperature coefficient. Leave open to minimize the temperature compensation coefficient. Ground. Must be connected to ground for proper operation. This is the only package ground connection.
GND
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M02069 Data Sheet
Preliminary Information
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2.0 Product Specification
2.1
Absolute Maximum Ratings
These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reliable operation at these extremes for any length of time is not implied.
Table 2-1.
Symbol
VCC VCC3 TA TSTG IBIASOUTCA (MAX) IBIASOUTCC (MAX) IMODCA (MAX) IMODCC (MAX) DIN+/DIS
Absolute Maximum Ratings
Preliminary Information
Parameter
Power supply voltage 3.3V power supply voltage Operating ambient temperature Storage temperature Maximum bias output current for common anode laser Maximum bias output current for common cathode laser Maximum modulation current for common anode laser Maximum modulation current for common cathode laser Data inputs Disable input Bias and modulation output current mirror compliance voltage Photodiode anode voltage Sink or Source current Status flag Set inputs Temperature compensation slope Output
Rating
-0.4 to +6.0 -0.4 to +4.0 -40 to +85 -65 to +150 75 30 70 30 -0.4 to VCC3 + 0.4 -0.4 to VCC + 0.4 -0.4 to VCC3 + 0.4 -0.4 to VCC3 + 0.4 2.0 -0.4 to VCC + 0.4 -0.4 to VCC3 + 0.4 -0.4 to VCC3 + 0.4 -0.4 to VCC + 0.4
Units
V V C C mA mA mA mA V V V V A V V V V
BIASMON, MODMON IPIN IPIN FAIL APCSET, MODSET TCSLOPE OUT+, OUT-
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M02069 Data Sheet
2.2
Table 2-2.
Recommended Operating Conditions
Recommended Operating Conditions Parameter Rating 3.3 7.5% or 5.0 + 10%,-5% -40 to + 85 Units V C
Power supply (VCC-GND) Operating ambient
2.3
DC Characteristics
(VCC = +3.05V to +3.55V or 4.75V to 5.5V, TA = -40 C to +85 C, unless otherwise noted) Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 C, unless otherwise noted. Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 C, unless otherwise noted
Table 2-3.
Symbol
ICC
Preliminary Information
DC Characteristics
Parameter
Supply current excluding IMOD and IBIAS
Conditions
PEAKADJ high (no peaking adjust) Common anode operation(1) Common cathode operation(1) Additional current when PEAKADJ is used. Additional current when operating from a 5V supply(2)
Min.
- - -
Typ.
Max.
Units
mA
28 35
48 55
-
- 4
7 TBD 50 15 mA mA A
IBOUTCA IBOUTCC IBOFF
Bias current adjust range, common anode mode Bias current adjust range, common cathode mode Bias current with optical output disabled
V(IBIASOUT) > 0.7V V(IBIASOUT) < 2.5V DIS = high V(IBOUTCA) = VCC3 for common anode operation. V(IBOUTCC) = 0V for common cathode operation. CCSEL low, common anode mode CCSEL high, common cathode mode VCC =3.3V Adjusted with RAPCSET
1 0.5 - -
150
Ratio of IBIAS current to BIASMON current VMD IMD Monitor diode reverse bias voltage Monitor diode current adjustment range Ratio of TxPwrMON current to monitor photodiode current
- 1.7 10
50 15 - - 1
- - 1500
A/A V A A/A
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Product Specification
Table 2-3.
Symbol
CMD_MAX
DC Characteristics
Parameter
Maximum monitor photodiode capacitance for APC loop stability. Includes all associated parasitic capacitances. TTL/CMOS input high voltage (DIS) TTL/CMOS input low voltage (DIS) CMOS input high voltage (VCC3SEL) CMOS input low voltage (VCC3SEL) Logic output high voltage (FAIL) Logic output low voltage (FAIL) With external 10k pull-up to VCC. sink current = 1.5mA Data inputs VCC - 0.6 - --Data inputs = 2 x (DIN+HIGH - DIN+LOW) t.b.d. 200 2.6 3.65 4.3 5.6 1.1 - - 8000 VCC3 - 1.3 - - 2.8 3.8 4.5 5.8 1.3 1.3 1.0 2.0 - 2.4 1.2 - 0.4 - -VCC3-[VIN(Diff)]/4 2400 2.9 4.0 4.65 6.0 1.4 - -
Conditions
Min.
Typ.
Max.
100
Units
pF
5.5 0.8
V V V V V V W V V mVpp V V V V V V V
Preliminary Information
RIN VSELF VINCM VIN(DIFF) VCC3THL(3)
Differential input impedance Self-biased common-mode input voltage Common-mode input compliance voltage Differential input voltage 3.3V supply detection, lower threshold
VCC3THH(3) 3.3V supply detection, upper threshold VCC5THL VCC5THH VREF1 VAPCSET VBL 5V supply detection, lower threshold 5V supply detection, upper threshold Reference voltage for MODSET Reference voltage for APCSET Bias_OK lower voltage threshold
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M02069 Data Sheet
Table 2-3.
Symbol
VBH VFAULTL(4)
DC Characteristics
Parameter
Bias_OK upper voltage threshold Lower voltage threshold for fault inputs IBOUTCA, OUT+, CAPC, and MODSET fault inputs IBOUTCC FAIL asserts if any of these signals fall below this value. FAIL asserts if any of these signals fall above this value. 2.6 0.5
Conditions
Min.
Typ.
1.6 300
Max.
Units
V
375
mV
VFAULTH(5) Upper voltage threshold for
VSELFL VSELFH
2.7 1.6 1.6 1.8 2.2
V V V
Self bias voltage for IBOUTCA During disable state and OUT+ Self bias voltage for IBOUTCC During disable state
Notes: 1. Excludes bias and modulation currents. 2. Bias and modulation currents add directly to power supply current in 5V applications. The additional supply current noted excludes these currents. 3. VCC3 "supply OK" circuitry monitors the internally regulated 3.3V supply when VCC = 5V (VCC3SEL =low). When VCC = 3.3V, VCC3 "supply OK" circuitry monitors VCC (VCC3SEL =high). 4. A low level at IBOUTCA does not trigger a fault condition during common cathode operation. 5. A low level at IBOUTCC does not trigger a fault condition during common anode operation.
Preliminary Information
2.4
AC Characteristics
(VCC = 3.05 V to 3.55V or 4.7V to 5.5V, TA = -40 C to +85 C, unless otherwise noted) Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 C, unless otherwise noted. Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 C, unless otherwise noted.
Table 2-4.
Symbol
IMOD
AC Characteristics - Logic Timing
Parameter
Modulation current adjust range
Conditions
Common Cathode Mode OUT+ and OUT- AC coupled into 50 load. Common Anode Mode OUT+ and OUT- DC coupled into 25 load.(1)
Min.
1
Typ.
-
Max.
15
Units.
mA
3
45
IMOD(OFF)(2)
Modulation current with output disabled Ratio of modulation current to MODMON current
DIS = high CCSEL = high, RLOAD = 50 CCSEL = low
- -
- 30 65
150 -
A A/A
IMOD-TC TTCSTART
Programmable range for modulation current temperature coefficient Temperature at which modulation current TC compensation enables
Adjustable using TCSLOPE
0
- 20
104
ppm/C C
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Table 2-4.
Symbol
tr tf OSOFF RJ DJ
AC Characteristics - Logic Timing
Parameter
Modulation output rise time Modulation output fall time Overshoot of modulation output current in the "off" direction Random jitter Deterministic jitter Measured into 25 load, 231 - 1 PRBS at 2.7 Gbps K28.5 pattern at 4.3 Gbps (includes pulse width distortion(4)) into 25 load
Conditions
20% to 80% into 25 . (IMOD = 28 mA). Measured using 11110000 pattern at 2.5Gbps
(3)
Min.
- - --
Typ.
TBD TBD 1 0.8 10 10
Max.
80 80 2 - 25 23
Units.
ps ps % psrms pspp
Notes: 1. Minimum voltage at OUT+ > 0.7V. 2. The current through the laser in this state can be made negligible by adding a 1k or less resistor in parallel with the laser. 3. The M02069 is designed to drive 25 loads. External resistance should be added in series or parallel to the Laser to create this load impedance. In common cathode mode, 50 resistors internal to the M02069 are in parallel with the laser. 4. Pulse width distortion is measured single-ended.
Preliminary Information
2.5
Safety Logic Timing
(VCC = 3.05 V to 3.55V or 4.7V to 5.5V, TA = -40 C to +85 C, unless otherwise noted) Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 C, unless otherwise noted. Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 C, unless otherwise noted.
Table 2-5.
Symbol
t_off t_on t_init
Safety Logic Timing
Parameter
DIS assert time DIS negate time Time to initialize(2)
Conditions
Rising edge of DIS to fall of output signal below 10% of nominal(1) Falling edge of DIS to rise of output signal above 90% of nominal(1) Includes reset of FAIL; from power on after Supply_OK or from negation of DIS during reset of FAIL condition
Min.
Typ.
Max.
10 1
Units.
s ms ms
2
3
5
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29
M02069 Data Sheet
Table 2-5.
Symbol
t_fault t_reset tVCC_OK t_onBM t_offBM
Safety Logic Timing
Parameter Conditions Min. Typ. Max.
100 10(3) 10 20 300 200 500 500
Units.
s s s ns ns
Laser fault time - from fault condition From occurrence of fault condition or when to assertion of FAIL Supply_OK is beyond specified range DIS time to start reset Supply_OK delay time DIS negate (turn-on) time during burst-mode operation DIS assert (turn-off) time during burst-mode operation DIS or ENA pulse width required to initialize safety circuitry or reset a latched fault Delay between Supply_OK condition and when outputs are enabled Using integrated switch at SVCC (3.3V operation) (4) Using integrated switch at SVCC (3.3V operation)(4)
Notes: 1. With CAPC = 2.2nF 2. User-adjustable. Specifications reflect timing with no external RESET capacitor. 3. With < 1nF capacitor from RESET pin to ground. 4. Imod > 12mA
Preliminary Information
Figure 2-1.
Safety Logic Timing Characteristics Slow Rise on Vcc=3.3V at Power-up (DIS Low)
3.3V
Hot Plug (DIS Low)
VCC3 and VCC5 status
VCC3 and VCC5 "OK"
VCC 3.3V VCC3
FAIL
(low)
FAIL
FAIL state at power-up will depend on pull-up voltage
(low)
DIS
(low) t_on < 1ms, (300 s typ.)
DIS (low) t_on < 1ms, (300 s typ.) LASER OUTPUT
LASER OUTPUT
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Product Specification
Slow Rise on Vcc=5V at Power-up (DIS Low)
Transmitter Enable (DIS transition Low)
5V
VCC 3.3V VCC3
VCC3 and VCC5 status
(high)
VCC3 and VCC5 "OK"
FAIL
FAIL (low)
(low)
Preliminary Information
DIS
(low) t_on < 1ms, (300 s typ.)
DIS
(low) t_on < 1ms, (300 s typ.)
LASER OUTPUT
LASER OUTPUT
Transmitter Disable (DIS transition high)
Fault Recovery Behaviour
Fault recovery at: MODSET. CAPC, OUT+, IBOUT CA or IBOUT CC FAIL
VCC3 and VCC5 status
(high)
VCC3 and VCC5 "OK"
Fault Removed
FAIL
(low)
FAIL remains high until reset by DIS going high
DIS
DIS
t_reset, 10 s, min. t_on < 1ms
t_off < 10 s, (1 s typ.)
LASER OUTPUT
LASER OUTPUT
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M02069 Data Sheet
Response to Fault
Fault at: MODSET. CAPC, OUTP, IBOUT CC or IBOUT CA Fault Occurs
Unsuccessful Fault Reset Attempt
Fault at: APCSET
t_fault < 100 s, (4 s typ.)
Fault Remains
FAIL
FAIL
t_init < 5ms, (3ms typ.)
DIS
DIS
t_reset, 10 s, min.
LASER OUTPUT
LASER OUTPUT
Preliminary Information
Figure 2-2.
Relationship Between Data Inputs and Modulation Outputs
D+
IN
100 mV 1200 mV
DIN-
V
IN(DIFF)
200 mV 2400 mV
V
OUT-
VOUT+ > 0.7V GND
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02069-DSH-001-C
Product Specification
2.6
2.6.1
2.6.1.1
Figure 2-3.
Package Specification
Mechanical Description
Package Details
QFN24 Package Information
Preliminary Information
Note: View is for a 20 pin package. All dimensions in the tables apply for the 24 pin package
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M02069 Data Sheet
Figure 2-4.
Pin Assignments for M02069 Device
PEAKADJ
TCSLOPE
MODSET
24
CCSEL 19 SVCC/ IBOUT CC OUTOUT+ 18
VCC DIN+
1
DIN\ VCC3SEL DIS FAIL 6 13 GND, connect to PCB ground
CAPC
VCC3
RESET
DISDLY
MODMON
BIASMON
TXPWRMON
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APCSET
Preliminary Information
GND0 IBOUT / CA SGND IPIN
7
12 4 X 4 mm
02069-DSH-001-C
Product Specification
2.7
t/b/d
Thermal Characteristics
2.8
2.8.1
t/b/d
Manufactureability
Electrostatic Discharge
2.8.2
t/b/d
Peak Reflow Temperature
Preliminary Information
2.8.3
t/b/d
Moisture Sensitivity Level (MSL)
2.9
t/b/d
Design Considerations
Component Placement and Layout
2.9.1
t/b/d
2.9.2
t/b/d
Routing Considerations
2.9.3
t/b/d
Thermal Considerations
02069-DSH-001-C
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M02069 Data Sheet
Preliminary Information
36
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02069-DSH-001-C
Preliminary Information
(c) 2003, 2004 Mindspeed TechnologiesTM, Inc. All rights reserved. Information in this document is provided in connection with Mindspeed TechnologiesTM ("MindspeedTM") products. These materials are provided by Mindspeed as a service to its customers and may be used for informational purposes only. Except as provided in Mindspeed's Terms and Conditions of Sale for such products or in any separate agreement related to this document, Mindspeed assumes no liability whatsoever. Mindspeed assumes no responsibility for errors or omissions in these materials. Mindspeed may make changes to specifications and product descriptions at any time, without notice. Mindspeed makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF MINDSPEED PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. MINDSPEED FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. MINDSPEED SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS. Mindspeed products are not intended for use in medical, lifesaving or life sustaining applications. Mindspeed customers using or selling Mindspeed products for use in such applications do so at their own risk and agree to fully indemnify Mindspeed for any damages resulting from such improper use or sale.
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M02069 Data Sheet
www.mindspeed.com General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters - Newport Beach 4000 MacArthur Blvd., East Tower Newport Beach, CA. 92660
Preliminary Information

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