The HXC44200 is a bi-directional Dual Channel PAM-4 CDR / Retimer for retiming data rates from 51GS/s to 56GS/s. It is optimized for 50Gbps Ethernet, OIF CEI-56G-VSR applications with low power consumption of sub-250mW per channel (56Gbps).

The HXC44200 provides programmable and adaptive equalization in the receiver and programmable de-emphasis in the transmitter to compensate for channel Insertion Loss and ISI. In the receive direction, the programmable / adaptive CTLE provides up to 7 dB of equalization and a 1-tap DFE provides additional compensation. In the transmit direction, the programmable, 4-bit, de-emphasis with 3-tap FIR (pre,main,post) filter provides a 9 dB control range.

Auto DC-offset calibration is complemented with auto phase calibration and the unique CDR / Retimer architecture enables independent receive and transmit CDR loop bandwidth optimization for increased Jitter Tolerance and reduced Jitter Transfer performance.

Able to be used with or without a reference clock with a built-in, single 14GHz master VCO providing the oscillator output for each channel.

Multiple Built in Self-Test (BIST) functions such as a PRBS generator / checker, Jitter Tolerance, Eye Open Monitor, and single lane loopback are supported for module level testing.

The HXC44200 has an I2C interface that is used to set the start-up operating mode for the internal state machine which performs all required calibrations and settings. The HXC44200 is packaged in a 5x5mm BGA in 9×9 grid of 0.5mm pitch.


  • Dual 51 – 2GS/s PAM-4 CDR / Retimer
  • Programmable 3-tap output de-emphasis for transmit
  • Adaptive linear equalizer and decision-feedback equalizer (DFE) to cover up to 14 dB lossy channel in receiver
  • Low sensitivity of and adjustable threshold level of data sampler
  • Reference-less and Master channel-less operation
  • Independent, adaptive bandwidth control in RX CDR for optimum jitter tolerance
  • Programmable output swing up to 800mVpp
  • Internal and automatic DC and phase offset calibrations
  • On-chip testability; EOM, JTOL, PRBS generator/checker, local/remote loopback,
  • Polarity (P/N) inversion
  • I2C control interface

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Temp. Grade Carrier Type Buy Sample
HXC42200-EVB Preview BD0 BOARD C Box
Notice: there are one or more orderable products that are not available in your region. For questions, contact your local sales representative.

Technical Documentation

Title Other Languages Type Format File Size Date
HXC42200 Product Brief Product Brief PDF 229 KB