DS42BR400_15 Datasheet, PDF (1/18 Pages) Texas Instruments – DS42BR400 Quad 4.25 Gbps CML Transceiver with Transmit De-Emphasis and Receive Equalization

DS42BR400
www.ti.com
SNLS221J – MARCH 2006 – REVISED APRIL 2013
DS42BR400 Quad 4.25 Gbps CML Transceiver with Transmit
De-Emphasis and Receive Equalization
Check for Samples: DS42BR400
FEATURES
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•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 WQFN-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
APPLICATIONS
• Backplane Driver or Cable Driver
• Signal Repeating, Buffering and Conditioning
Applications
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.
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.
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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 © 2006–2013, Texas Instruments Incorporated