ADR365 supplied with DCDC converter

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Accepted Answer

Q 
 Can I supply ADR365 with a DCDC-boost converter ( In this case providing 5.5V)? This voltage could have a ripple up to 100mV and the DCDC is working at 1.6MHz. 
 
 A 
 You will have to add a filter to get rid of the ripple noise from the DCDC converter. Looking at Figure 22 in the datasheet "ripple rejection ratio vs. frequency", the ADR365 won&rsquo;t suppress ripple at his frequency of 1.6MHz. You should consider how much ripple you can tolerate from the DCDC converter and through the ADR365 and then design the appropriate filter. I highly suggest that you look in two places for this: (1) The application section of the DCDC converter to see if they have a filter suggestion (2) Our new Filter Wizard tool https://www.analog.com/designtools/en/filterwizard

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ADR365: FAQ