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56-Gb/s PAM4 Transmitter

TX56-PAM4 is a high speed transmitter provides high- quality differential data with PAM-4 signal up to 56 Gb/s and beyond. Driven by external quarter-rate clocks (i.e., 14-GHz clock input for 56-Gb/s data output), TX56- PAM4 generates PAM-4 signal which combines two true pseudo-random bit sequence (PRBS) of length 27-1 with built-in PRBS generator, or fed four quarter-rate data sequence from external. TX56-PAM4 achieves differential output magnitude of 600 mV and a duty cycle correction (DCC) unit provides a maximum tunable range of 40%~60%, well beyond any possible eye distortion.

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