IMX7 ADC question

frankyhsu — Wed, 01 Mar 2017 14:31:31 GMT

I am checking the ADC input resistance for IMX7 and I found the R_IEXT need to be small to driver the ADC input. Does it mean we need to have 50~250 ohm pull-high to 1.8V and use 10k NTC to GND? Like the below schematic?

Franky

Re: IMX7 ADC question

CarlosCasillas — Fri, 03 Mar 2017 01:36:38 GMT

Hi Franky,

Such parameter is not specifically about such hardware configuration (although the idea is maintaining the impedance as low as possible). However, you could refer to the following documents/application notes about ADC parameters and recommendations:

http://www.nxp.com/assets/documents/data/en/application-notes/AN2438.pdf

http://www.nxp.com/assets/documents/data/en/application-notes/AN1058.pdf

http://www.nxp.com/assets/documents/data/en/application-notes/AN4373.pdf

http://www.nxp.com/assets/documents/data/en/supporting-information/Analog-to-digital-Converter-Training.pdf

Hope this will be useful for you.
Best regards!
/Carlos
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IMX7 ADC question

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