Other Parts Discussed in Thread: INA317, INA819, INA818, OPA365, INA331, REF6050
Dear TI Support,
I am designing a custom prototype board to read ADC from an input using ADS8881. I attached the schematic below. My problem is that I got so much noise when reading the ADC; when I shorted the 2 inputs together (2 inputs from the opamp in front of the ADS8881), the data was still not stable, I got the value from 0x3D090 to 0x2328. For the C7 capacitor in the schematic, I replaced it with the 4.7uF. I am not really good at hardware design.
I use the 50 MHz clock on SCK line, I read the data from the ADS8881 through 3-wire SPI mode every 100us and I want the make the chip work as fast as possible. Can you give me some advises with my design, do I have to add any components or any kind of filter?
Thank you and best regards,