Four channel 24G / 25G CDR with input equalizer

The MASC-37448A is a four channel 25G / 28G CDR with input equalizer for use as a transmit device in optical modules and Active Optical Cables (AOC). The MASC-37448A CDRs retime at 25.78 Gbps for 100GbE and EDR Infiniband, 27.95 Gbps for OTU4, and 28.05 Gbps for 32G Fiber Channel applications. Each channel includes adaptive input equalization, a high performance CDR, and an output driver with programmable output swing and de-emphasis. The CDR is reference-free and can be bypassed to support legacy or non-standard datarates. The MASC-37448A is available in a 4 mm x 4.5 mm chip scale package (CSP) and integrates diagnostic features such as PRBS9/31 pattern generator and PRBS31 error detector. The device is powered from a single 1.8V supply delivering industry’s leading low power consumption. The device is controlled through a 2-wire serial interface.

Product Specifications

Part Number
Four channel 24G / 25G CDR with input equalizer
Max Data Rate(Gbps)
Number of Channels
Package Type
Integrated CDR


  • Quad 25.78 Gbps/28.05 Gbps CDR
  • Extracted clock output Fb/2, Fb/8, Fb/32 or Fb/40 (Monitor Clock)
  • Supports -40 °C to +85 °C case temperature
  • Low output jitter
  • High input jitter tolerance
  • Low power
  • Reference-free CDR
  • Adaptive input equalization with optional programmable
  • Programmable LOS threshold
  • Programmable output de-emphasis
  • Programmable output swing
  • Integrated PRBS Generator and Checker

Technical Resources

Data Sheet

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CDR,Integrated Equilization, TX
CDR,Integrated Equilization, TX