My customer have troubles with AD7191 pin DOUT/RDTY
Information from datasheet:
DOUT/RDY operates as a data ready pin, going low to indicate the completion of a conversion. If the data is not read after the conversion, the pin goes high before the next update occurs.
Problem: If pins AIN1 and AIN2 are short-circuited => DOUT/RDY pin constantly high, but must be low.
"Good" picture - XS=1, DOUT/RDY goes low when conversion finished. DOUT/RDY is blue.
"Bad" picture - XS=5, this is the moment, when AIN2 on the GND. DOUT/RDY is yellow.
Additional test: AIN1 and AIN2 was short-circuited without GND - the picture was the same, so the problem is not associated with ground.
Do you have any ideas, what should we do?