Hi Manoj, No we haven't resolved it. For now we have switched to the uncoded CLK'd version of the delta-sigma chip ( AMC1306M25 ) and it is working fine. However I'm still hoping to figure out what's going on here so we can use the Manchester version on future projects. But unfortunately I can't find the time to investigate it further right now so I'll mark this thread as resolved for now and open a related question in the future. In answer to your last question, by "input is +/5Vpp (+/-125mV)" I mean the voltage input at the terminals of the AMC1303E2510 is +/-125mV. This is well within the linear input range of that chip (the linear input range is +/-250mV) therefore I don't think the problem is with the AMC1303E2510 . Thanks, Fearghal
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