DS42BR400_14 Datasheet, PDF (1/16 Pages) Texas Instruments – Quad 4.25 Gbps CML Transceiver with Transmit De-Emphasis and Receive Equalization

DS42BR400
www.ti.com
SNLS221I – MARCH 2006 – REVISED MARCH 2009
DS42BR400 Quad 4.25 Gbps CML Transceiver with Transmit
De-Emphasis and Receive Equalization
Check for Samples: DS42BR400
FEATURES
1
•2 250 Mbps – 4.25 Gbps Fully Differential Data
Paths
• Optional Fixed Input Equalization
• Selectable Output De-emphasis
• Individual Loopback Controls
• On-chip Termination
• Lead-less eLLP-60 pin package (9 mm x 9 mm
x 0.8 mm, 0.5 mm pitch)
• −40°C to +85°C Industrial Temperature Range
• 6 kV ESD Rating, HBM
DESCRIPTION
The DS42BR400 is a quad 250 Mbps – 4.25 Gbps CML transceiver, or 8-channel buffer, for use in backplane
and cable applications. With operation down to 250 Mbps, the DS42BR400 can be used in applications requiring
both low and high frequency data rates. Each input stage has a fixed equalizer to reduce ISI distortion from
board traces. The equalizers are grouped in fours and are enabled through two control pins. These control pins
provide customers flexibility where ISI distortion may vary from one direction to another.
All output drivers have four selectable steps of de-emphasis to compensate against transmission loss across
long FR4 backplanes. The de-emphasis blocks are also grouped in fours. In addition, the DS42BR400 also has
loopback control capability on four channels. All CML drivers have 50Ω termination to V_CC. All receivers are
internally terminated with differential 100Ω.
Applications
• Backplane driver or cable driver
• Signal repeating, buffering and conditioning applications
Simplified Application Diagram
FPGA
PreA_0
PreA_1
PreB_0
PreB_1
IA0
OA0
IA1
OA1
IA2
OA2
IA3
OA3
OB0
IB0
OB1
IB1
OB2
IB2
OB3
IB3
EQA
EQB
Lossy Backplane
or Cable Interconnect
IA0
OA0
IA1
OA1
IA2
OA2
IA3
OA3
OB0
IB0
OB1
IB1
OB2
IB2
OB3
IB3
EQA
EQB
FPGA
PreA_0
PreA_1
PreB_0
PreB_1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2009, Texas Instruments Incorporated