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AD7745 single or continuos conversion(s)

Question asked by sylmar on Jun 29, 2018

I am trying to optimize  AD7745 conversion modes and filters. Below are a couple configurations I have

 

1. Longest conversion time and continuous conversions

2. Longest conversion time and single conversion

3. Shortest conversion time and continuous conversions

4. Shortest conversion time and single conversion

 

Also, I have only single excitation input and one Cin.

All (1), (2) and (3) configurations reading are far off from the actual cap while

(4) is very closed (10% off).

 

I wonder my setups have some issues and why the shortest conversion time and single conversion

has better data.

I am looking forward to hearing from you.

 

Thanks

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