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AD7175 - 2.5k output rate setup results in 1.6k output rate

Question asked by Luis-Afonso on Aug 5, 2018
Latest reply on Aug 7, 2018 by JellenieR

Hello,

 

I am trying to use a AD7175 with 2 channels. I require at least 1kSPS for each channel so I imagined setting it to 2.5kSPS would allow this. Instead it sets to 1.6kSPS.
For reference I am using continuous read mode with "append" status register  and CRC.  I used a scope on the RDY pin to measure the output data rate.

I attempted to set HIDE_DELAY and the delay is actually set to 0.


Tested with some other data rates and it seems to be around 58% of the expected data rate

 


Not being exactly 1kSPS is not a issue but I would like to have predictable time periods when changing the data output rate. Is there an explanation for the low data rate?

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