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AD7175-2 settling time of first channel in single conversion mode

Question asked by Cheray on Apr 19, 2017
Latest reply on May 22, 2017 by JellenieR

Application:

I enabled all 4 channels in AD7175-2, and set the ODR to 17,857SPS.

Using single conversion mode to sample all the channels by writing to ADC Mode register with 0x4010.

Question:

The settling time of first channel ( time after writing the ADC Mode register to the first falling edge of RDY) is about 78us.

Settling time of the later 3 channels( time between adjacent falling edge of RDY) is 56us, which is the same as the datasheet discribed.

So why the first settling time takes 20us more?

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