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AD7795 External Clock

Question asked by AnalogPAT on Dec 10, 2015
Latest reply on Jan 10, 2016 by JellenieR

In single conversion mode the AD7795 powers up takes a conversion then returns to the power down mode. I presume the internal clock is stopped during power down mode.

 

I want to drive the ADC with an accurate microcontroller derived 128Khz clock for better immunity and synchronisation of multiple devices using the external clock divide by 2 option.

 

1) Do I need to stop the clock when I have read the conversion ?

2) Do I need to stop the clock when I read the conversion to get the same power down current as when using an internal clock.

3) Are there any side effects of stopping the external clock between conversions. Presumably the 1ms clock stabilisation time with the internal clock is not required with an external clock.

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