MPC5746R analog multiplex ADC reference design

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MPC5746R analog multiplex ADC reference design

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jamesmurray
Contributor V

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

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Unfortunately we do not have any reference design for this configuration.

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jamesmurray
Contributor V

I added ticket no. 00264904 for this question too.

If possible, I will share any findings back here.

James

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