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AD7609 - Powering from ADuM5400

Question asked by johnnyp on Mar 30, 2016
Latest reply on Apr 21, 2016 by jcolao

Customer has questions regarding powering the AD7609 via the ADuM5400.


The ADC (7609) requires a 5V analog PLUS a 5V or 3.3V Digital power signal. The ADuM5400 series only supplies a single output (as configured),but can certainly source enough power to power the AD7609. 

1) Is this 5V output clean enough to operate the ADC converter for the analog power input?  I couldn’t find any reference to p-p noise on the output.

2) Could we revert to the 10 Ohm resistor plus a couple of caps between the analog and digital supply so we could get by with a single supply to operate both inputs?  Or would you recommend two separate supplies?