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DC-DC converter ripple on ADC

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sudil99

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I am using LT3525 as 5V dc-dc converter to power my microcontroller. And, I am using the in-built ADC. But, I get some ripples on my ADC readings, which I guess is due to the ripple of dc-dc converter because I do not get those ripples if I do not use the dc-dc converter. So, how can I get rid off this problem?
 

Show your schematic.

Page 1 of the LT3525 datasheet provide a recommended filter configuration (recommended component placement on page 10). Are you using it?
 

Hi Sudil
A good solution ! add a capacitor ( low value ) ( such as 2.2uf ) nearby supply of your ADC . ( pretty nearby it's pins ) . thus the problem should be removed , as well .
Best Wishes
Goldsmith
 

You did not mention the microcontroller type but often there is a separate Vcc pin on the processor for ADC that allows for a separate supply or at least additional power supply filtering to this supply pin. It is easier to filter the lower current supply load for ADC then the whole processor and decouple supply noise coming from the fast switching digital logic.
 

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