I have a question.
Is it possible to use the same analog power source for both ADAU1977 and AD1934?
If so, are there any precautions?
Can you give more information on your application? I assume you meant sharing 3.3V AVDD for 1977/1934.
The 3.3V supply can be shared but if using the ADAU1977 boost Converter then will need high value decoupling capacitors to keep the AVDD supply clean. You might need 10uF/22uF capacitor with low ESR for the Boost converter at 3.3V source in your system. Refer to the EVAL-ADAU1977Z schematic. If you have a schematic to share it would be good.
Thank you for your answer.
>Can you give more information on your application?
My Application is ANC(Automatic Noise Canceler) which will be installed in cars.
>I assume you meant sharing 3.3V AVDD for 1977/1934.
I am going to refer to the EVAL-ADAU1977Z schematic as you recommended.
Just as the AD1934 data sheet p.14 says, my application is critical.
I am guessing that I may need as clean AVDD supply as possible.
I would like to know how strictly I should follow a line of the data sheet of AD1934(p.14)
"For critical applications, improved performance is obtained with separate supplies for the analog and digital sections." ?
Thank you very much
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