Hi!
I am building a recording device with 6 different analog inputs (only 2 active at a time) and I was planning to use TLV320ADC3101 for this. When I try to use some of the channels as single ended inputs, there is an offset value in the recorded signal. See the picture below. I have set the registers
52 = 0xdf (left adc, IN3L single ended input)
55 = 0xf4 (right adc, IN2R single ended input)
and in the 2nd recording
52 = 0xdf (left adc, IN3L single ended input) (same)
57 = 0xfc (right adc, IN1L single ended input) <- This is the only recorded signal that works as expected
What is the reason for the offset in the signal? All 6 inputs are connected using 1uF AC coupling capacitors.
Best regards,
Stefan