Problem with gain in AD4111.

Question

I have a problem with AD4111. After reset on VIN0-VIN1 I always read from DataRegister value with gain about 0,423, for example Vin=10V Vadc = 4,23V. The same situation is in unipolar and bipolar mode. My question is - is it possible that this gain value is normal and I must calibrate it? This is a very large gain change to get a right value and in my opinion something is wrong. But what?

JellenieR · Accepted Answer

Hi, 
 Sorry for the delay. This was missed. The voltage divider on the analog front end has a division ratio of 10. Thus, the gain should be 0.1. However, when using a voltage input, the corresponding gain register must be modified by running an internal full scale calibration or by changing gain register with a nominal value of 0x55567C. May I know also how did you connected the inputs? If you could share also the schematic, that would be great. 
 Thanks, 
 Jellenie)

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Problem with gain in AD4111.