1 Features
1• Pin Compatible Retimer Family
– DS110DF111 with DFE: 8.5 - 11.3 Gbps
– DS125DF111 with DFE: 9.8 - 12.5 Gbps
• Adaptive CTLE: 33 dB Max Boost at 6.25 GHz
• Self Tuning 5-Tap DFE
• Raw Equalized and Retimed Data Loopback
• Adjustable Transmit V OD: 600 to 1300 mVp-p
• Settable Tx De-Emphasis Driver 0 to –12dB
• Low Power Consumption: 220 mW/Channel
• Locks to Half/Quarter/Eighth Data Rates for
Legacy Support
• On-Chip Eye Monitor (EOM), PRBS Generator
• Input Signal Detection, CDR Lock
Detection/Indicator
• Single 3.3-V or 2.5-V Power Supply
• SMBus, EEPROM, or Pin Based Configuration
• 4-mm x 4-mm, 24-Pin WQFN Package
• Operating Temp Range: –40°C to 85°C

2 Applications
• Front Port Optical Interconnects
• SFF-8431
• 10G/1G Ethernet
• CPRI

3 Description
The DS125DF111 is a dual channel (1-lane
bidirectional) retimer with integrated signal conditioning. The DS125DF111 includes an input
Continuous-Time Linear Equalizer (CTLE), clock and
data recovery (CDR) and transmit driver on each
channel.
The DS125DF111 with its on-chip Decision Feedback
Equalizer (DFE) can enhance the reach and
robustness of long, lossy, cross-talk-impaired high
speed serial links to achieve BER < 1x10–15. For less
demanding applications/interconnects, the DFE can
be switched off and achieve the same BER
performance. The DS125DF111 and DS110DF111 devices are pin-compatible.
Each channel of the DS125DF111 independently locks to specific serial data at data rates from 9.8 to
12.5 Gbps or to any supported sub-rate of these data
rates. This simplifies system design and lowers
overall cost.
Programmable transmit de-emphasis driver offers
precise settings to meet the SFF-8431 output eye
template. The fully adaptive receive equalization
(CTLE and DFE) enables longer distance transmission in lossy copper interconnect and
backplanes with multiple connectors. The CDR
function is ideal for use in front port parallel optical
module applications to reset the jitter budget and retime high speed serial data.