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a u s t ri a m i c r o s y s t e m s
A S 11 5 2 Q u a d LV D S D r i v e r
D a ta S he e t
1 General Description
The AS1152 is a Quad Flow-Through LVDS (Low-Voltage Differential Signaling) Line Driver which accepts and converts LVTTL/LVCMOS input levels into LVDS output signals. The device is perfect for low-power lownoise applications requiring high signaling rates and reduced EMI emissions. The device is guaranteed to transmit data at speeds up to 500Mbps (250MHz) over controlled impedance media of approximately 100. Supported transmission media are PCB traces, backplanes, and cables. The AS1152 is capable of setting all four outputs to a high-impedance state through two Enable Inputs (EN and ENn - internally pulled down to GND), dropping the device to an ultra-low-power state of 16mW (typical) during high impedance. The Enable Inputs are common to all four drivers. Outputs conform to the ANSI TIA/EIA-644 LVDS standards. Flow-through pinout simplifies PC board layout and reduces crosstalk by separating the LVTTL/LVCMOS inputs and LVDS outputs. The AS1152 operates from a single +3.3V supply and is specified for operation from -40 to +85C.
2 Key Features
! !
Flow-Through Pinout Guaranteed 500Mbps Data Rate (paired with AS1150) 350ps Pulse Skew (Max) Conforms to ANSI TIA/EIA-644 LVDS Standards Single +3.3V Supply Operating Temperature Range: -40 to +85C 16-Pin TSSOP Package
! ! ! ! !
3 Applications
Digital Copiers, Laser Printers, Cellular Phone Base Stations, Add/Drop Muxes, Digital Cross-Connects, DSLAMs, Network Switches/Routers, Backplane Interconnect, Clock Distribution Computers, Intelligent Instruments, Controllers, Critical Microprocessors and Microcontrollers, Power Monitoring, and Portable/Battery-Powered Equipment.
Figure 1. Block Diagram
VCC
OUT1+ IN1 OUT1-
OUT2+ IN2 OUT2-
OUT3+ IN3 OUT3-
OUT4+ IN4 OUT4-
EN ENn
AS1152
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4 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 1. Absolute Maximum Ratings Parameter VCC to GND INx, EN, ENn to GND OUTx+, OUTx- to GND Short Circuit Duration (OUTx+, OUTx-) Continuous Power Dissipation (TA = +70C) Storage Temperature Range Maximum Junction Temperature Operating Temperature Range Limits -0.3 to +5.0 -0.3 to (VCC + 0.3) -0.3 to +5 Continuous 755 -65 to +150 +150 -40 to +85 mW
C C C
Units V V V
Notes
Derate 9.4mW/C Above +70C
Package Body Temperature
260
C
The reflow peak soldering temperature (body temperature) specified is in compliance with IPC/ JEDEC J-STD-020C "Moisture/ Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". Human Body Model, INx, OUTx+, OUTx--
ESD Protection
4
kV
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DC Electrical Characteristics
5 Electrical Characteristics
DC Electrical Characteristics
(VCC = +3.0 to +3.6V, TA = -40 to +85C , RL = 100, f 150Mhz Typical values are at VCC = +3.3V, TA = +25C, Unless Otherwise Noted.)1, 2 Table 2. DC Electrical Characteristics Parameter LVDS Output (OUtx+, OUTx-) Differential Output Voltage
Change in Magnitude of VOD Between Complementary Output States VOD
Symbol
Conditions
Min
Typ
Max
Unit
Figure 20 on page 12 Figure 20 on page 12 Figure 20 on page 12 Figure 20 on page 12
250
370 1
450 35 1.375 25 1.6
mV mV V mV V V
VOD
VOS
Offset Voltage
Change in Magnitude of VOS Between Complementary Output States
1.125
1.25 4
VOS
VOH VOL IOSD IOS IOZ IOFF
Output High Voltage Output Low Voltage Differential Output Short-Circuit Current 3 Output Short-Circuit Current Output High-Impedance Current Power-Off Output Current Inputs (INx, EN, ENn) High-Level Input Voltage Low-Level Input Voltage Input Current Supply Current No-Load Supply Current Loaded Supply Current Disabled Supply Current Notes:
0.90
Enabled, VOD = 0 OUTx+ = 0 at INx = VCC or OUTx- = 0 at INx = 0, enabled EN = low and ENn = high, OUTx+ = 0 or VCC, OUTx- = 0 or VCC, RL = VCC = 0 or open, OUTx+ = 0 or 3.6V, OUTx- = 0 or 3.6V, RL =
-9 -3.8 -10 -20 -9 10 20
mA mA A A
VIH VIL IIN INx, EN, ENn = 0 or VCC RL = , INx = VCC or 0 for all channels RL = 100, INx = VCC or 0 for all channels Disabled, INx = VCC or 0 for all channels, EN = 0, ENn = VCC
2.0 GND -20
VCC
V V A
0.8 20
ICC ICCL ICCZ
4 18 3.5
6 25 5.5
mA mA mA
1. Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are 100% tested at TA = +25C. 2. Currents into the device are positive, and current out of the device is negative. All voltages are referenced to ground except VOD. 3. Guaranteed by correlation data.
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Switching Characteristics
Switching Characteristics
(VCC = +3.0 to +3.6V, RL = 100 1%, f 150MHz, TA = -40 to +85C Typical values are at VCC = +3.3V, TA = +25C, Unless Otherwise Noted.) 1, 2, 3
Table 3. Switching Characteristics Parameter Differential Propagation Delay, High-to-Low Differential Propagation Delay, Low-to-High Differential Pulse Skew 4 Differential Channel-to-Channel Skew 5 Differential Part-to-Part Skew 6 Differential Part-to-Part Skew 7 Rise Time Fall Time Disable Time, High-to-Z Disable Time, Low-to-Z Enable Time, Z-to-High Enable Time, Z-to-Low Maximum Operating Frequency 8, 9 Notes: 1. Parameters are guaranteed by design and characterization. 2. CL includes probe and jig capacitance. 3. Signal generator conditions for dynamic tests: VOL = 0, VOH = 3V, f = 100MHz, 50% duty cycle, RO = 50, tR 1ns, tF 1ns (0 to 100%). 4. tSKD1 is the magnitude difference of differential propagation delay. tSKD1 = |tPHLD - tPLHD|. 5. tSKD2 is the magnitude difference of tPHLD or tPLHD of one channel to the tPHLD or tPLHD of another channel on the same device. 6. tSKD3 is the magnitude difference of any differential propagation delays between devices at the same VCC and within 5C of each other. 7. tSKD4 is the magnitude difference of any differential propagation delays between devices operating over the rated supply and temperature ranges. 8. fMAX signal generator conditions: VOL = 0, VOH = 3V, 50% duty cycle, RO = 50, tR 1ns, tF 1ns (0 to 100%). 9. Conforms to ANSI TIA/EIA 644 LVDS Standards 150MHz. Maximum operating frequency of 250MHz is possible using an AS1150 receiver. Symbol tPHLD tPLHD tSKD1 tSKD2 tSKD3 tSKD4 tTLH tTHL tPHZ tPLZ tPZH tPZL fMAX Conditions Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 18 on page 11 and Figure 19 on page 11 Figure 21 on page 12 and Figure 22 on page 12 Figure 21 on page 12 and Figure 22 on page 12 Figure 21 on page 12 and Figure 22 on page 12 Figure 21 on page 12 and Figure 22 on page 12 250 0.2 0.2 Min 1.1 1.1 0.04 0.07 0.13 0.43 0.39 0.39 3 3 2 2 Typ Max 1.7 1.7 0.35 0.60 0.8 1.0 2.6 2.6 4 4 3 3 Unit ns ns ns ns ns ns ns ns ns ns ns ns MHz
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Switching Characteristics
6 Typical Operating Characteristics
VCC = +3.3V, VCM = +1.2V, |VID| = 0.2V, CLOAD = 15pF, Tamb = +25C, unless otherwise noted Figure 2. Output High Voltage vs. VCC
1.41
Figure 3. Output Low Voltage vs. VCC
1.08
Output High Voltage (V) .
1.408
VOUT+
Output Low Voltage (V) .
1.075
VOUT-
1.406
VOUT-
1.07
VOUT+
1.404
1.402
1.065
1.4 3 3.1 3.2 3.3 3.4 3.5 3.6
1.06 3 3.1 3.2 3.3 3.4 3.5 3.6
Power-Supply Voltage (V)
Power-Supply Voltage (V)
Figure 4. Output Short-Circuit Current vs. VCC; VIN = VCC or GND
3.700
Figure 5. Output High-Impedance State Current vs. VCC; VIN = VCC or GND
30
Output Short-Circuit Current (mA) .
3.675 3.650 3.625 3.600 3.575 3.550 3.525 3.500 3 3.1 3.2 3.3 3.4 3.5 3.6
Output High-Z State Current (A) .
29 28 27 26 25 24 3 3.1 3.2 3.3 3.4 3.5 3.6
Power-Supply Voltage (V)
Power-Supply Voltage (V)
Figure 6. Differential Output Voltage vs. VCC
350
Figure 7. Differential Output Voltage vs. Load Resistor
500
.
345 340 335 330 325 320 3 3.1 3.2 3.3 3.4 3.5 3.6
Differential Output Voltage (mV)
Differential Output Voltage (V)
.
450
400
350
300
250 90 100 110 120 130 140 150
Power-Supply Voltage (V)
Load Resistor (Ohm)
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Switching Characteristics
Figure 8. Offset Voltage vs. VCC
1.244
Figure 9. Power Supply Current vs. Frequency; VIN = 0 to 3V
60
Power-Supply Current (mA)
. Offset Voltage (V) .
1.243 50 40 1.242 30
All Channels
1.241
20
One Channels
1.24 3 3.1 3.2 3.3 3.4 3.5 3.6
10 0.1 1 10 100 1000
Power-Supply Voltage (V)
Frequency (MHz)
Figure 10. ICC vs. VCC; Freq = 1MHz
19.5
Figure 11. ICC vs. Temperature; Freq = 1MHz
22
.
Power-Supply Current (mA)
Power-Supply Current (mA)
3 3.1 3.2 3.3 3.4 3.5 3.6
19.25 19 18.75 18.5 18.25 18
.
21 20 19 18 17 -50
-30
-10
10
30
50
70
90
Power-Supply Voltage (V)
Temperature(C)
Figure 12. Differential Propagation Delay vs. VCC; Freq = 1MHz
1.6
Figure 13. Differential Propagation Delay vs. Temperature; Freq = 1MHz
1.6
.
Diff. Propagation Delay (ns)
1.5
Diff. Propagation Delay (ns)
.
1.5
tPHLD
1.4
tPHLD
1.4
tPLHD
1.3
tPLHD
1.3
1.2
1.2
1.1 3 3.1 3.2 3.3 3.4 3.5 3.6
1.1 -50
-30
-10
10
30
50
70
90
Power-Supply Voltage (V)
Temperature (C)
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Switching Characteristics
Figure 14. Differential Skew vs. VCC; Freq = 1MHz
150
Figure 15. Differential Skew vs. Temperature; Freq = 1MHz
150
.
120
. Diff. Pulse Skew (ps)
3 3.1 3.2 3.3 3.4 3.5 3.6
120
Diff. Pulse Skew (ps)
90
90
60
60
30
30
0
0 -50
-30
-10
10
30
50
70
90
Power Supply Voltage (V)
Temperature (C)
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Pin Assignments
7 Pinout and Packaging
Pin Assignments
Figure 16. AS1152 Pin Assignments (Top View)
EN IN1 IN2 VCC GND IN3 IN4 ENn
1 2 3 4
16 15 14 13
OUT1OUT1+ OUT2+ OUT2OUT3OUT3+ OUT4+ OUT4-
AS1152
5 6 7 8 12 11 10 9
TSSOP
Pin Descriptions
Table 4. AS1152 Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name EN IN1 IN2 VCC GND IN3 IN4 ENn OUT4OUT4+ OUT3+ OUT3OUT2OUT2+ OUT1+ OUT1Description Driver Enable Input. Internally pulled down to GND. When EN = high and ENn = low or open, the driver outputs are active. For other combinations of EN and ENn, the outputs are disabled and in high impedance. LVTTL/LVCMOS Driver Input LVTTL/LVCMOS Driver Input Power Supply Input. Bypass VCC to GND with 0.1F and 0.001F ceramic capacitors. Ground LVTTL/LVCMOS Driver Input LVTTL/LVCMOS Driver Input Driver Enable Input. Internally pulled down to GND. When EN = high and ENn = low or open, the driver outputs are active. For other combinations of EN and ENn, the outputs are disabled and in high impedance. Inverting LVDS Driver Output Noninverting LVDS Driver Output Noninverting LVDS Driver Output Inverting LVDS Driver Output Inverting LVDS Driver Output Noninverting LVDS Driver Output Noninverting LVDS Driver Output Inverting LVDS Driver Output
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LVDS Interface
8 Detailed Description
LVDS Interface
The LVDS interface standard is a signaling method intended for point-to-point communication over a controlled-impedance medium as defined by the ANSI/TIA/EIA-644 and IEEE 1596.3 standards. The LVDS standard uses a lower voltage swing than other common communication standards, achieving higher data rates with reduced power consumption while reducing EMI emissions and system susceptibility to noise. The AS1152 is an 500Mbps quad differential LVDS driver that is designed for high-speed, point-to-point, low-power applications. This device accepts LVTTL/LVCMOS input levels and translates them to LVDS output signals. The AS1152 generates a 2.5mA to 4.5mA output current using a current-steering configuration. This current steering approach induces less ground bounce and no shoot-through current, enhancing noise margin and system speed performance. The driver outputs are short-circuit current limited, and enter a high-impedance state when the device is not powered or is disabled. The current-steering architecture of the AS1152 requires a resistive load to terminate the signal and complete the transmission loop. Because the device switches current and not voltage, the actual output voltage swing is determined by the value of the termination resistor at the input of an LVDS receiver (AS1150, AS1151). Logic states are determined by the direction of current flow through the termination resistor. With a typical 3.7mA output current, the AS1152 produces an output voltage of 370mV when driving a 100 load.
Note: The AS1152 is conform to the ANSI TIA/EIA 644 LVDS Standards when operating 150MHz. Paired with the AS1150 the datarate can be increased to 500Mbps. While operating faster then 150MHz, the rise and fall time, as well as the setup and hold time are not conform to the ANSI TIA/EIA 644 LVDS Standards.
Termination
Because the AS1152 is a current-steering device, no output voltage will be generated without a termination resistor. The termination resistors should match the differential impedance of the transmission line. Output voltage levels depend upon the value of the termination resistor. The AS1152 is optimized for point-to-point interface with 100 termination resistors at the receiver inputs. Termination resistance values may range between 90 and132, depending on the characteristic impedance of the transmission medium.
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Power-Supply Bypassing
9 Applications
Table 5. Function Table Enable Pins EN H H ENn L or Open L or Open INx+ L H Don't Care Input INxL H Z Output OUTx H L Z
Other Combinations of Enable Pin Settings Figure 17. Typical Application Circuit
LVDS Signals
Tx
107
Rx
Tx
107
Rx
LVTTL/LVCMOS Data Inputs Tx 107 Rx
LVTTL/LVCMOS Data Outputs
Tx
107
Rx
AS1152
AS1151
Quad LVDS Receiver
100 Shielded Twisted Cable or Microstrip PC Board Traces
Power-Supply Bypassing
To bypass VCC, use high-frequency surface-mount ceramic 0.1F and 0.001F capacitors in parallel as close to the device as possible, with the smaller valued capacitor closest to pin VCC.
Differential Traces
Input trace characteristics can adversely affect the performance of the AS1152.
!
Use controlled-impedance PC board traces to match the cable characteristic impedance. The termination resistor is also matched to this characteristic impedance. Eliminate reflections and ensure that noise couples as common mode by running the differential traces near each other. Reduce skew by using matched trace lengths. Tight skew control is required to minimize emissions and proper data recovery of the devices. Route each channel's differential signals very close to each other for optimal cancellation of their respective external magnetic fields. Use a constant distance between the differential traces to avoid irregularities in differential impedance. Avoid 90 turns (use two 45 turns). Minimize the number of vias to further prevent impedance irregularities.
!
!
!
! !
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Cables and Connectors
Supported transmission media include printed circuit board traces, backplanes, and cables.
!
Use cables and connectors with matched differential impedance (typically 100) to minimize impedance mismatches. Balanced cables such as twisted pair offer superior signal quality and tend to generate less EMI due to magnetic field canceling effects. Balanced cables pick up noise as common mode, which is rejected by the LVDS receiver. Avoid the use of unbalanced cables such as ribbon cable or simple coaxial cable.
!
!
Board Layout
The device should be placed as close to the interface connector as possible to minimize LVDS trace length.
! ! !
Keep the LVDS and any other digital signals separated from each other to reduce crosstalk. Use a four-layer PC board that provides separate power, ground, LVDS signals, and input signals. Isolate the input LVDS signals from each other and the output LVCMOS/LVTTL signals from each other to prevent coupling. Separate the input LVDS signals from the output signals planes with the power and ground planes for best results.
!
Figure 18. Driver Propagation Delay and Transition Time Waveforms
1.5V INx tPLHD OUTx0 Differential OUTx+
1.5V
tPHLD VOH 0
VOL
80% 0 20% VDIFF = (VOUTx+) - (VOUTx-)
80% 0 20%
tTLH
tTHL
Figure 19. Driver Propagation Delay and Transition Time Test Circuit
OUTx+
Generator
INx
RL
50 OUTx-
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Figure 20. Driver VOD and VOS Test Circuit
OUTx+
RL/2 VCC INx GND RL/2 VOS VOD
OUTx-
Figure 21. Driver High Impedance Delay Waveforms
EN when ENn = 0 or Open 1.5V 1.5V 0 3V
3V 1.5V ENn when EN = VCC tPHZ OUTx+ When INx = VCC OUTx- When INx = 0 50% 50% 1.2V 1.2V 50% OUTx+ When INx = 0 OUTx- When INx = VCC tPLZ 50% VOL tPZL tPZH VOH 1.5V 0
Figure 22. Driver High-Impedance Delay Test Circuit
OUTx+ RL/2 INx GND +1.2V RL/2 Generator 50 EN OUTxENn 1/4 AS1152
VCC
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Board Layout
10 Package Drawings and Markings
Figure 23. 16-pin TSSOP Package
Notes: 1. All dimensions are in millimeters; angles in degrees. 2. Dimensioning and tolerancing per ASME Y14.5M - 1994. 3. Dimension D does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, and gate burrs shall not exceed 0.15mm per side. 4. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusions shall not exceed 0.25mm per side. 5. Dimension b does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. 6. Terminal numbers are for reference only. 7. Datums A and B to be determined at datum plane H. 8. Dimensions D and E1 are to be determined at datum plane H. 9. This dimension applies only to variations with an even number of leads per side. 10. Cross section A-A to be determined at 0.10 to 0.25mm from the leadtip.
Symbol A A1 A2 L R R1 b b1 c c1 1 L1 aaa bbb ccc ddd e 2 3 D E1 E e N
Typ 0.90 0.60 0.22 1.0REF 0.10 0.10 0.05 0.20 0.65BSC 12REF 12REF Variations 4.90 5.00 4.30 4.40 6.4BSC 0.65BSC 16
Min 0.05 0.85 0.50 0.09 0.09 0.19 0.19 0.09 0.09 0
Max 1.10 0.15 0.95 0.75 0.30 0.25 0.20 0.16 8
Notes 1,2 1,2 1,2 1,2 1,2 1,2 1,2,5 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2,3,8 1,2,4,8 1,2 1,2 1,2,6
5.10 4.50
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Board Layout
11 Ordering Information
Part Number AS1152 AS1152-T Description Quad low-voltage differential signaling driver Quad low-voltage differential signaling driver Package Type 16-pin TSSOP 16-pin TSSOP Delivery Form Tube Tape and Reel
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Board Layout
Copyrights
Copyright (c) 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com
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