STM32f469 - ADC accuracy

[BSR]

Hello ,

We are interfacing Analog Accelerometer with STM32f469. Attached here ADC interface hardware and ADC firmware (configuration) for your reference .

Problem is Accuracy with ADC values. The ADC values are varying approximately 30mV .

Can anyone help in terms of hardware or firmware for getting below +/-5mV accuracy?

[raptorhal2]

You may have fixed this already, but IN1 needs to be rank = 2.

480 cycles should be much more than adequate for accuracy with an opamp input, so if your rank is correct and you don't see that noise at the opamp output, you are left with chasing VDDA noise and grounding,

Cheers, Hal

[waclawek.jan]

Read AN4073.

JW

PS. Change your username to a normal nick.

[BSR]

Dear Hal ,

Can you brief IN1 needs to be rank =2. ​

[raptorhal2]

You are converting 3 channels of rank 1, 1 and 3. They should be rank 1, 2 and 3.

Hal