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Altera_Forum's avatar
Altera_Forum
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14 years ago

Blown ADC?

I'm currently designing an audio analysis system on a DE0-Nano board, I'd previously tested the ADC section of the design and all was working perfectly. However now that it's come to final test...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

I wouldn't say your ADC has blown.

Looking at your ADC1 screenshot, it sounds like:

1) You are using a 12-bit ADC

2) When your signal amplitude goes down to zero, your data acquisition logic seems to interpret the ADC output code differently from what you are expecting. Does the SignalTap bus display format match the ADC output coding (signed/unsigned, binary or 2's complement etc...) ?