lpcware

ADCHS interference

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by gjdevos on Wed Nov 26 12:47:16 MST 2014
We have an LPC4370, 256 pin package connected to external RAM and some external peripherals through
the GPIO ports. When using the ADCHS at 10 Msample/s, we see strong interference of GPIO and EMC
activity in the acquired signal. What are the things to pay attention to, to minimize interference? I know about
the chapter on ADC interference in the manual about GPIO pin assignments next to the ADC pins. We
followed the advice given but it turns out this is not enough to remove the interference from the ADC samples.

Any suggestions are welcome. We are considering to add an external ADC to the LPC4370 to get rid of the
digital noise.

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