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Altera_Forum
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10 years ago

How to recombine LVDS data received from ADC in FPGA.

I am configuring an Analog to Digital Converter(ADC) reciently. I use AD9265. It works in LVDS mode, not CMOS mode. I learn something about LVDS from the datasheet of AD9265. It's my first time to ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

BFxx is a fairly large negative number. you are measuring in Air, so you could have a significant DC offset on your input.

Have you tried just driving the AD9625 with a sin wave and see what you get? Does the resulting data look like a sin wave?

If so, can you actually drive it to a significant value, before it saturates your front end, or does the front end saturate in one direction before the other.

Without the whole circuit, it's hard to say where the issue is originating form, but it looks like you are combining the data properly. So my expectation is there some DC offset happening on the analog side.

Pete