DS25BR400_14 Datasheet, PDF (1/17 Pages) Texas Instruments – Quad 2.5 Gbps CML Transceiver with Transmit De-Emphasis and Receive Equalization

DS25BR400
www.ti.com
SNLS230I – MAY 2006 – REVISED FEBRUARY 2013
DS25BR400 Quad 2.5 Gbps CML Transceiver with Transmit
De-Emphasis and Receive Equalization
Check for Samples: DS25BR400
FEATURES
1
•2 250 Mbps – 2.5 Gbps Low Jitter Operation
• Optional Fixed Input Equalization
• Selectable Output De-Emphasis
• Individual Loopback Controls
• On-Chip Termination
• +3.3V Supply
• Lead-Less WQFN-60 Pin Package
– (9 mm x9 mm x0.8 mm, 0.5 mm Pitch)
• −40°C to +85°C Industrial Temperature Range
• 6 kV ESD Rating, HBM
APPLICATIONS
• Backplane or Cable Driver
• Signal Buffering and Repeating
DESCRIPTION
The DS25BR400 is a quad 250 Mbps – 2.5 Gbps
CML transceiver, or 8-channel buffer, for use in
backplane and cable applications. With operation
down to 250 Mbps, the DS25BR400 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 enabled through two control pins.
These control pins provide flexibility in applications
where ISI distortion may vary from one direction to
another. All output drivers have four selectable steps
of de-emphasis to compensate for transmission loss.
The de-emphasis blocks are also grouped in fours. In
addition, the DS25BR400 also has loopback control
capability on four channels. All the 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
IA1
IA2
IA3
OB0
OB1
OB2
OB3
OA0
OA1
OA2
OA3
IB0
IB1
IB2
IB3
EQA EQB
Lossy Backplane
or Cable Interconnect
IA0
IA1
IA2
IA3
OB0
OB1
OB2
OB3
OA0
OA1
OA2
OA3
IB0
IB1
IB2
IB3
EQA EQB
FPGA
PreA_0
PreA_1
PreB_0
PreB_1
NOTE
All CML inputs and outputs must be AC coupled for optimal performance.
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