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?
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…
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 for advise. All is ok now, input buffer (INBUF0 in my case)was off and after switching it on all seems to be ok.
hello jaro73, how are you? I am testing the EVAL AD4111 board, connected to an ESP32, using the AD7173 library as a base, modifying the setup of the channels, which is one of the differences between both ICs, but still giving me an error when communicating with SPI, Could you help me? How did you communicate with the AD4111? Thank you
Does the AD4111 come with a 0.1-gain amplifier? Then my +50V single-ended analog voltage input is not 5V after 0.1 gain, can I directly feed the ADC, no external op amp conditioning