Is there a working reference design for external multiplexed analogue channels? Particularly I want to see a known good design with low crosstalk between channels and accurate readings.
I have encountered a similar problem as this customer asked about here
https://community.nxp.com/thread/457095
I have not yet tried such a large value for DSD but with a value of 1000, I am seeing at least 25mV errors in the measured ADC count apparently due to crosstalk with adjacent channels. This is with op-amp buffers ahead of the multiplex. Without the op-amps I was seeing up to +/- 500mV of crosstalk !!
If there isn't an existing reference design, can I reach out to an applications engineer to work with me on this?
regards
James
Unfortunately we do not have any reference design for this configuration.
I added ticket no. 00264904 for this question too.
If possible, I will share any findings back here.
James