四通路28Gbps TIA + CDR + LA；-12dBm典型活络度，LOS阈值可编程；均匀光电流监督；输出摆幅可编程及去加沉职能
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4 Channel 28Gbps TIA + CDR + LA; -12dBm typical sensitivity.High-sensitivity limiting amplifier with programmable LOS threshold.Average photodiode current monitor,

Programmable output swing and de-emphasis.