Four channel 24G / 25G CDR with Integrated Limiting Amplifier

The MASC-37446A is a four channel 25.78 Gbps / 28.05 Gbps CDR with integrated limiting amplifier for use as a receive device in optical modules. The MASC-37446A CDRs retime at 25.78 Gbps, 27.95 Gbps, and 28.05 Gbps. Each channel includes a high-sensitivity limiting amplifier, a high performance CDR, and an output driver with programmable output swing and 2-tap de-emphasis. The CDR is reference-free and can be bypassed to support legacy or nonstandard data rates. This device is assembled in a 4 mm x 4.5 mm chip scale package (CSP) and integrates diagnostic features such as PRBS31/9 generation and PRBS31 error checking. The device is powered from a single 1.8 V 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 Integrated Limiting Amplifier
Max Data Rate(Gbps)
Number of Channels
Package Type
Integrated CDR


  • Quad 25.78 Gbps/28.05 Gbps CDR
  • Supports -40 °C to +85 °C case temperature
  • Low output jitter and high input jitter tolerance
  • Low power
  • Reference-free CDR
  • High-sensitivity limiting amplifier
  • Extracted clock output fb/2, fb/8, fb/32 or fb/40 (Monitor clock)
  • Programmable slice level adjust
  • Programmable output swing
  • Integrated PRBS Generator and Checker
  • Programmable output de-emphasis
  • Programmable LOS threshold

Technical Resources

Data Sheet

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Quad-CDR,Limiting Amplifier, RX
Quad-CDR,Limiting Amplifier, RX