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SigmaDSP ADC and DAC full-scale levels and signal scaling

Question asked by BrettG on Mar 8, 2012
Latest reply on Mar 8, 2012 by BrettG

Here's a question I received from an anonymous customer:

 

Why does it seem that I can never really get a truly expected output...even for the simplest setup [ADC in, DSP through, DAC out]?  Not really a big deal for audio...but I'm wondering what I'm missing or not seeing here.

For instance, for the project file below, I put about 1Vpp in and even though there is no reduction set in the input or output settings in SigmaStudio, there is a signal reduction.  Maybe there is something in my setup causing this.

Scope shots of Input Pin 3 (LAUX) and Output (LHP) below.

 

ScreenHunter_01 Mar. 08 11.28.jpg

1.008 V peak-to-peak

 

ScreenHunter_02 Mar. 08 11.28.jpg

954 mV peak-to-peak

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