56Gb/s PAM4 CDR/Retimer, Uni-Di

The HXC44400 is a uni-directional Quad Channel PAM-4 CDR / Retimer for retiming data rates from 51GS/s to 56GS/s. It is optimized for 100Gbps Ethernet, OIF CEI-56G-VSR applications with low power consumption of sub-250mW per channel (56Gbps).

The HXC44400 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 HXC44400 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 HXC44400 is packaged in a 5x5mm BGA in a 9×9 grid of 0.5mm pitch.