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Re: AD7656 Vdrive issue

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Hello Francisco,

 

are possibly some digital inputs driven by sources with a higher supply? If a digital input is driven above Vdrive it would probably power the Vdrive net over the ESD-diodes in the input structures.

 

If you can ensure, that no digital input powers the Vdrive-net in reverse, then here's another idea: the LD1117 requires a minimum load of several mA. The load on the Vdrive-net may be to small for that. You could add e.g. a 470Ohm resistor from Vdrive to GND and check, if Vdrive goes to the 3,3V you expect.


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