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19-2159; Rev 0; 9/01
MAX3273 Evaluation Kit
General Description
The MAX3273 evaluation kit (EV kit) is an assembled demonstration board that provides optical and electrical evaluation of the MAX3273. The EV kit is composed of two independent sections, one optical and one electrical, on the PC board. The output of the electrical evaluation section is interfaced to an SMA connector that can be connected to a 50 terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/ monitor diode. o Fully Assembled and Tested o Single 3.3V Power-Supply Operation o Input Termination Provided On-Board o Enables Optical and Electrical Evaluation
Features
Evaluates: MAX3273
Ordering Information
PART MAX3273EVKIT TEMP RANGE -40C to +85C IC PACKAGE 24 QFN*
*Exposed pad
Electrical Evaluation Component List
DESIGNATION C13, C40 C14, C18, C21, C23, C24 C15, C16, C31, C32, C37, C45 C27, C28 C30 C41 D3 D4 J5-J9 JU4, JU5, JU9-JU13, JU18-JU20 JU7, JU8 QTY 2 5 6 2 1 1 1 1 5 DESCRIPTION 10F 20% tantalum capacitors AVX TAJC106K016 0.1F 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0402) 0.056F 10% ceramic capacitors (0603) 470pF 10% ceramic capacitor (0402) 0.01F 10% ceramic capacitor (0603) LED, red T1 package Diode DIO-S1A SMA connectors (tab contact) EFJohnson 142-0701-851 1 x 2-pin headers (0.1in centers) 1 x 3-pin headers (0.1in centers) DESIGNATION L6 L7, L12 L9 L10, L11 R4 R5 R12 R13, R37 R17 R22, R38 R23, R25 R26 R28, R30 10 2 R29 R46 R47 QTY 1 2 1 2 1 1 1 2 1 2 2 1 2 1 1 1 DESCRIPTION 33H power inductor Coilcraft DO1608C-333 Ferrite beads (0805) Murata BLM21A102S 1.2H inductor Coilcraft 1008CS-122XKBC Ferrite beads (0603) Murata BLM11HA601SG 1k 1% resistor (0603) 681 1% resistor (0603) 500k variable resistor 100k variable resistors 110 1% resistor (0603) 49.9 1% resistors (0402) Open 2k 1% resistor (0402) 100 5% resistors (0201) 0 resistor (0402) 5.11 1% resistor (0603) 392 1% resistor (0603)
________________________________________________________________ Maxim Integrated Products
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MAX3273 Evaluation Kit Evaluates: MAX3273
Electrical Evaluation Component List (continued)
DESIGNATION R51 Q2 U3 U4 VCC1, GND1, TP2, TP3, TP8, TP10-TP13, TP22 QTY 1 1 1 1 DESCRIPTION 24.9 1% resistor (0402) PNP transistor (SOT23) Zetex FMMT591A MAX495ESA (8 SO) MAX3273EGG (24 QFN) DESIGNATION None None None QTY 10 1 1 Shunts MAX3273 evaluation kit MAX3273 data sheet DESCRIPTION
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Test points
Optical Evaluation Component List
DESIGNATION C1, C2, C9, C10, C11, C17, C38 C3-C6 C7 C8 C12 C19 C20, C22 C36 D1 D2 J1-J4 JU2, JU3 QTY 7 DESCRIPTION 0.01F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitors (0402) 0.056F 10% ceramic capacitor (0402) 470pF 10% ceramic capacitor (0402) Open, user-supplied (0402)* 10F 20% tantalum capacitor AVX TAJB106K016 0.01F 10% ceramic capacitors (0603) 100pF 5% ceramic capacitor (0603) LED, red T1 package Open, user-supplied laser diode SMA connectors (tab contact) EFJohnson 142-0701-801 1 x 3-pin headers (0.1in centers) DESIGNATION JU6, JU14-JU17 L1 L2, L3, L5 L4 R1 R2 R3 R6 R7 R8 R9, R14 R10, R11 R15 R16 R18 R20 R21 QTY 5 1 3 1 1 1 1 1 1 1 2 2 1 1 1 1 1 DESCRIPTION 1 x 2-pin headers (0.1in centers) 33H power inductor Coilcraft DO1608C-333 Ferrite beads (0603) Murata BLM11HA601SG 1.2H inductor Coilcraft 1008CS-122XKBC 1k 1% resistor (0603) 500k variable resistor 75 1% resistor (0402) 24.9 1% resistor (0402) 2k 1% resistor (0402) 0 resistor (0402) 100k variable resistors 100 5% resistors (0201) 681 1% resistor (0603) 110 1% resistor (0603) Open, user-supplied (0402)* 20 1% resistor (0402) 49.9 1% resistor (0402)
4 1 1 1 1 2 1 1 1 4 2
*These components are part of the compensation network, which can reduce overshoot and ringing. Parasitic series inductance introduces a zero into the laser's frequency response. R18 and C12 add a pole to cancel this zero. Starting values for most coaxial lasers is R18 = 75 in series with C12 = 3.3pF. These values should be experimentally adjusted until the output waveform is optimized.
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MAX3273 Evaluation Kit
Optical Evaluation Component List (continued)
DESIGNATION U1 VCC2, GND2, TP1, TP4-TP7, TP9, TP14 None None None QTY 1 9 8 1 1 DESCRIPTION MAX3273EGG (24 QFN) Test points Shunts MAX3273 evaluation kit MAX3273 data sheet
5) Adjust R37, the RMODSET potentiometer, for 10k resistance between TP10 and ground. 6) Adjust R12, the RBIASMAX potentiometer, for 10k resistance between TP2 and ground. 7) Adjust R13, the RAPCSET potentiometer, for 10k resistance between TP3 and ground. 8) Apply a differential input signal (200mV P-P to 1600mVP-P) between J7 and J8 (DATA+ and DATA-). 9) If the latch is enabled, apply a differential clock signal (200mVP-P to 1600mVP-P) between J5 and J6 (CLK+ and CLK-). 10) Attach a high-speed oscilloscope with a 50 input to J9. 11) Power-up the board and adjust the power supply until the voltage between TP11 and ground is +3.3V (VCC). 12) Adjust R12 until the desired laser bias current is achieved. V -V IBIAS = TP13 TP22 5.11 13) Adjust R37 until the desired laser modulation current is achieved. IMOD = Signal Amplitude (Volts) 25
Evaluates: MAX3273
Component Suppliers
SUPPLIER AVX Coilcraft Murata Zetex PHONE 803-946-0690 847-639-6400 814-237-1431 516-543-7100 FAX 803-626-3123 847-639-1469 814-238-0490 516-864-7630
Quick Start
Electrical Evaluation
In the electrical configuration, an automatic power control (APC) test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitor diode current is provided by Q2, which is controlled by an operational amplifier (U3). The APC test circuit consists of U3 and Q2, and applies the emulated monitor diode current (the laser bias current divided by a factor of 77) to the MD pin of the MAX3273. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) Place shunts on JU5, JU9-JU12, JU18, and JU20. 2) If the EV kit is to be used in open loop (no APC), place a shunt on JU4. (Refer to the Design Procedure section of the MAX3273 data sheet.) 3) If data is to be latched, place the shunt across pin 1 (VCC, square pad) and pin 2 (LATCH) of JU7 to enable the input clock; otherwise leave open. 4) To enable the outputs, place a shunt across pin 2 (EN) and pin 3 (GND) of JU8. Note: When performing the following resistance checks, manually set the ohmmeter to a high range to avoid forward-biasing the on-chip ESD protection diodes.
Optical Evaluation
For optical evaluation of the MAX3273, configure the evaluation kit as follows: 1) Place shunts on JU15, JU16, and JU17. 2) If the EV kit is to be used in open loop (no APC), place a shunt on JU14. (Refer to the Design Procedure section of the MAX3273 data sheet.) 3) If data is to be latched, place the shunt across pin 1 (VCC, square pad) and pin 2 (latch) of JU2 to enable the input clock; otherwise leave open. 4) To enable the outputs, place a shunt across pin 2 (EN) and pin 3 (GND) of JU3. 5) The EV kit is designed to allow connection of a variety of possible laser/monitor diode pin configurations. Connect a TO-header style laser with monitor diode (Figure 1) as follows: * Keeping its leads as short as possible, connect the laser diode to two of the three pads in the cutout portion on the top (component) side of the PC board. Solder the laser diode cathode to the center pad, and solder the anode to either of the other two pads (they are both connected to VCC).
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MAX3273 Evaluation Kit Evaluates: MAX3273
Adjustment and Control Descriptions (see Quick Start first)
COMPONENT OPTICAL JU2 JU3 JU14 R9 ELECTRICAL JU7 JU8 JU4 R37 NAME LATCH EN Open Loop RMODSET RBIASMAX FUNCTION Enables/disables the latching function from the clock input. Active high (shunt across pin 1 and pin 2 of JU2 or JU7 to enable latch). Enables/disables the output currents. Active low (shunt across pin 2 and pin 3 of JU3 or JU8 to enable output currents). Shunt JU4 or JU14 to operate in open-loop mode. Adjusts the laser modulation current. Adjusts the laser bias current. In open-loop mode, R2 or R12 adjusts the operating laser bias current. In closed-loop operation, R2 or R12 adjusts the maximum laser bias current limit. For closed-loop operation, R13 or R14 adjusts the monitor diode current level. TTL low level indicates a failure in the APC loop or open-loop operation. Set APC current, and then increase bias current until LED goes off (LED is illuminated when the APC loop is open and off when the APC loop is closed). Refer to the Design Procedure section of the MAX3273 data sheet.
R2
R12
R14 TP9
R13 TP8
RAPCSET Fail Indicator
D1
D3
Fail Indicator
*
Connect the monitor photodiode to two of the five pads on the bottom (solder) side of the PC board, directly below the laser diode pads. Three of these pads (the middle and outside positions) are initially not connected. The other two pads are connected to VCC. Solder the anode and cathode of the monitor photodiode to any two of the three pads that are not connected. Then connect the anode to the MD pin by shorting the corresponding solder jumper (Figure 1). Connect the cathode to VCC by using solder to bridge to an adjacent VCC pad.
9) Apply a differential input signal (200mVp-p to 1600mVp-p) between J1 and J2 (DATA+ and DATA-) 10) If the latch is enabled, apply a differential clock signal (200mVp-p to 1600mVp-p) between J3 and J4 (CLK+ and CLK-). 11) Attach the laser diode fiber connector to an optical/electrical converter. 12) Power-up the board and adjust the power supply until the voltage between TP14 and ground is +3.3V (VCC). 13) Adjust R2 until the LED, D1, is no longer illuminated. 14) Adjust R9 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter.
Note: When performing the following resistance checks, manually set the ohmmeter to a high range to avoid forward-biasing the on-chip ESD protection diodes. 6) Adjust R9, the RMODSET potentiometer, for 10k resistance between TP4 and ground. 7) Adjust R2, the RBIASMAX potentiometer, for 10k resistance between TP1 and ground. 8) Adjust R14, the RAPCSET potentiometer, for 10k resistance between TP7 and ground. (Refer to the Design Procedure section of the MAX3273 data sheet.)
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MAX3273 Evaluation Kit Evaluates: MAX3273
CONFIGURATION 1
TOP OF PC BOARD R20
CONFIGURATION 2
TOP OF PC BOARD R20
VCC
VCC
VCC
VCC
TO-46 CAN LASER/PHOTODIODE PAIR PD PD
TO-46 CAN LASER/PHOTODIODE PAIR
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
CONFIGURATION 3
TOP OF PC BOARD R20
CONFIGURATION 4
TOP OF PC BOARD R20
VCC
VCC
VCC
VCC
TO-46 CAN LASER/PHOTODIODE PAIR PD PD
TO-46 CAN LASER/PHOTODIODE PAIR
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3273 EV Kit _______________________________________________________________________________________ 5
Evaluates: MAX3273
VCC JU18 C14 0.1F D4 DIOS1A R47 392 R38 49.9 VCC TP13 C45 0.01F TP11 7 C40 10F 4 MO MAX495 TP3 TP8 FAIL VCC TP12 VMOON JU4 R29 0 L12 MURATA BLM21A102S MO R25 OPEN R51 C28 0.056F 24.9 R17 110 D3 LED C16 0.01F JU11 R5 681 JU12 RAPCSET R13 100k 1 3 BIAS C41 0.01F Q2 FMMT591A 6 U3 R46 5.11 2 VCC L9 1.2H
MAX3273 Evaluation Kit
BIASMAX
APCSET
APCFILT2
DATA+ J7 2 DATA+ U4 DATAMAX3273 4 VCC BIAS 14 GND VCC 13 C37 0.01F VCC BIAS TP22 VCC 5 CLK+ GND LATCH GND EN MODSET R28 100 6 CLK7 TP10 JU9 JU7 JU8 8 9 10 11 12 15 OUT+ 16 C21 0.1F C23 0.1F R30 100 3 OUT17
APCFILT1
C18 0.1F VCC VCC
FAIL
MD
Figure 2. MAX3273 EV Kit Schematic--Electrical Configuration
JU13 TP2 RBIASMAX R12 500k R4 1k JU10 VCC C15 0.01F 1 18 24 23 22 C31 0.01F 21 20 19 C30 470pF VCC L10 MURATA BLM11HA601SG C27 0.056F J9 OUT+ C24 0.1F L11 MURATA BLM11HA601SG R23 OPEN R22 49.9 VCC VCC R26 2k RMODSET R37 100k L7 MURATA BLM21A102S L6 COILCRAFT DO1608C-333 JU19 VCC JU20 JU5 VMODN C13 10F C32 0.01F
6
VCC1
GND1
DATA- J8
CLK+ J5
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CLK- J6
R21 49.9 TP14 VCC2
VCC2 C19 10F C20 0.01F
L4 1.2H
JU6
GND2 TP7 TP9 FAIL R16 110 586 JU14 584 C38 0.01F 6 VCC2 PHOTODIODE VCC2 FAIL MD BIASMAX APCSET APCFILT2 APCFILT1 C1 0.01F 1 VCC DATA+ DATAMAX3273 15 TP5 VCC2 C9 0.01F VCC2 L3 MURATA BLM11HA601SG VCC BIAS 14 GND VCC 13 U1 OUT+ 16 OUT17 C7 0.056F VCC 2 R11 100 3 4 VCC 5 CLK+ GND LATCH GND EN MODSET R10 100 6 CLK7 8 9 10 11 12 18 L2 MURATA BLM11HA601SG R6 24.9 R20 20 C12 OPEN R3 75 R18 OPEN 24 23 22 C10 0.01F 21 20 19 VCC2 D2 LASER 1 C36 C17 0.01F 100pF VCC2 5 4 R8 0 585 (REFER TO FIGURE 1) VCC2 VCC2 581 582 583 R15 681 JU17 RAPCSET R14 100k
TP1 RBIASMAX R2 500k R1 1k JU16 C8 470pF
Figure 3. MAX3273 EV Kit Schematic--Optical Configuration
D1 LED C2 0.01F 2 3 VCC2 (REFER TO FIGURE 1) VCC2 C22 0.01F VCC2 JU2 TP4 JU15 JU3 R7 2k RMODSET R9 100k VCC2 L1 COILCRAFT DO1608C-333 TP6 C11 0.01F L5 MURATA BLM11HA601SG
C3 0.1F
DATA+ J1
DATA- J2
C4 0.1F
C5 0.1F
CLK+ J3
Evaluates: MAX3273
_______________________________________________________________________________________
CLK- J4
C6 0.1F
MAX3273 Evaluation Kit
7
MAX3273 Evaluation Kit Evaluates: MAX3273
1.0"
1.0"
Figure 4. MAX3273 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX3273 EV Kit PC Board Layout--Component Side
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MAX3273 Evaluation Kit Evaluates: MAX3273
1.0"
1.0"
Figure 6. MAX3273 EV Kit PC Board Layout--Ground Plane
Figure 7. MAX3273 EV Kit PC Board Layout--Power Plane
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MAX3273 Evaluation Kit Evaluates: MAX3273
1.0"
Figure 8. MAX3273 EV Kit PC Board Layout--Solder Side
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MAX3273 Evaluation Kit Evaluates: MAX3273
LAYER PROFILE
THIS IS A 50 CONTROLLED-IMPEDANCE BOARD. THE LAYER PROFILE IS BASED ON THE FOLLOWING ASSUMPTIONS: 1) DIELECTRIC MATERIAL IS FR-4 WITH A DELECTRIC CONSTANT OF ~4.8 2) 1/2oz COPPER 3) DIFFERENTIAL 11.5 TRACE 10MIL SPACE; SINGLE ENDED 18.4MIL
11.5MIL
11.5MIL
10MIL PREPREG
CORE AS NEEDED
10MIL PREPREG
Figure 9. MAX3273 EV Kit PC Board Layer Profile
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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