Hi
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
Solved! Go to Solution.
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-Train...
Hope this will be useful for you.
Best regards!
/Carlos
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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-Train...
Hope this will be useful for you.
Best regards!
/Carlos
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------