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ADAU17xx Sigma DSP Readback cell inconsistent read with MicroController

Question asked by vnadon_B_ING on Apr 28, 2015
Latest reply on May 8, 2015 by vnadon_B_ING

Hi,

 

I can read a fixed DC source value (positive and negative) with my MicroController by using a DSP readback block. I can also read a sinus output in the MicroController using the DSP readback. BUT, once I connect a microphone signal which is amplified (hardware and software gain) the value I read with my Microcontroller is quite saturated, which is not the case when I look at the value in Sigma Studio.

 

Could it be something related to writing the registers for the gains in the Microcontroller or the Readback has buffer problems? or...?

 

Thanks for your help!

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