Tool/software:
Hello,
We are attempting to read 24 signals using a pair of ADS7953SBDBTR ADCs (U4 and U5) to read 24 signals (15 signals on on U4, 9 signals on U5).
The signals are sourced directly from 8 circuits, 3 signal outputs from each circuit (example of 1 circuit as shown below includes U12 current shunt monitor and U19 operational amplifier).
We see no noise on U19A-3. We see the below pattern on U19A-1 and the corresponding ADC_1 pin U4-21:
We see similar noise on other channels as shown below.
U20-1 / U5-23:
U21-1 / U5-28:
We have tried to test with ADC2 (U5) channels turned off, and we see reduced noise (but still noticeable) on U19A-1 and U4-21:
Is this noise expected, and is there anything we can do to reduce it (hardware changes etc)?
