Problem with gain in AD4111.

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

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

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.

Jarek

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