I have some problem with AD7683: my STM receive from ADC all zeroes ("0").
Using AD7683 with STM32F429.
Power : 3,3V.
REF : 3V.
+IN : 0..3V.
-IN : GND.
DATACLOCK trying from 2,9MHz to 10KHz.
Using 24 bit hardware SPI and 22 bit software SPI.
Trying change delay between CS following and SCK rising first bit.
It was seen pulsation 200mV on rising edge SCK.
Answer always zeroes.