**Category:**Software

**Product Number:**ADAU1701

Hello All,

I'm learning how to convert the the input voltage to dB in ADAU1701, and i know the voltage gain formula: A(V)=20lg(Vo/Vi). I took a test that sending a 1kHz sinewave which RMS value is -14dB to ADAU1701, and i measured the voltage RMS level of the sinewave is 200mV using the Oscilloscopes.

my question is:

how is it implemented in SigmaStudio or ADAU1701 to convert the voltage to dB? according to the formula, Vo and Vi should be known to calculate the voltage gain. but there is just the input voltage 200mV. Am i missing something? or Is it converted by using the full-scale input RMS voltage?

Could anyone give some explanation? Thanks!

Best Regards

Eason