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DS125DF111EVM: No singal detected on Channel A

Part Number: DS125DF111EVM

Hi, there

Can I ask a question regarding the DS125DF111EVM:  when 10Gbps Vpp=100mV data input was on channel B, everything works great, however when I just switch the input from channel B to channel A, no signal detected and current only 25 mA (3V). 

I can not find any register would select each channel ?  Is SMA1 and SMA5 can work  both way as input/output  as it is labled as "OutA+/InA+"?

Thanks alot



  • Hi Jim,

    Since we have 25mA current consumption as you noted, it seems channel A is not active. I am wondering if perhaps LPBK could be floating? In this case, INB goes to OUTA and OUTB. Please make sure LPBK is pulled high(INA to OUTA and INB to OUTB). Device 100-ohm interface is not bi-directional.