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SNLU180C – August 2015 – Revised September 2019
Copyright © 2015–2019, Texas Instruments Incorporated
DS250DF810EVM User’s Guide
User's Guide
SNLU180C – August 2015 – Revised September 2019
DS250DF810EVM User’s Guide
The DS250DF810 is an eight-channel multi-rate retimer with integrated signal conditioning. It is used to
extend the reach and robustness of long, lossy, crosstalk-impaired high-speed serial links while achieving
a bit error rate (BER) of 10-15 or less. Each channel of the DS250DF810 independently locks to serial
data rates in a continuous range from 20.6 Gbps to 25.8 Gbps or to any supported sub-rate (÷2 and ÷4),
including key data rates such as 10.3125 Gbps and 12.5 Gbps. Integrated physical AC coupling
capacitors (TX and RX) eliminate the need for external capacitors on the PCB. The DS250DF810 has a
single power supply and minimal need for external components. These features reduce PCB routing
complexity and BOM cost. The advanced equalization features of the DS250DF810 include a low-jitter 3-
tap transmit finite impulse response (FIR) filter, an adaptive continuous-time linear equalizer (CTLE), and
an adaptive decision feedback equalizer (DFE). This enables reach extension for lossy interconnect and
backplanes with multiple connectors and crosstalk. The integrated CDR function is ideal for front-port
optical module applications to reset the jitter budget and retime the high-speed serial data. The
DS250DF810 implements 2x2 cross-point on each channel pair, providing the host with both lane crossing
and fanout options.
The DS250DF810 can be configured via the default SMBus slave mode or with an external EEPROM. Up
to 16 devices can share a single EEPROM. A non-disruptive on-chip eye monitor and PRBS generator
and checker functions allow for in-system diagnostics. With this kit, users can quickly evaluate the
DS250DF810 retimer performance.
