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problem with auxiliary ADCs with ADAU1701

Question asked by modich90 on Aug 5, 2016
Latest reply on Aug 24, 2016 by DaveThib

Hi,

I have an ADAU1701 pcs realized according to Application note on page 47 of "ADAU1701 datasheet".

In some conditions, all 4 auxiliary ADCs - which are connected to buffered potentiometers - don't work as I expect.

I note that voltage on DVDD is about 2.4 V (out of "absolute maximum ratings" on page 10) and not 1.8V as described and recommended in the datasheet.

I verified that external voltage regulator shown in figure works well, except for collector voltage on pnp transistor.

Are ADAU or other ICs broken? What could be the cause of this malfunction?

 

I'm waiting for your response.

 

Best reguards.

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