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[i.MX6 ULL] External impedance of signals connected to the ADC

Question asked by Christian Eggers on Oct 12, 2018
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IMX6ULLIEC.pdf, page 98

Characteristic ConditionsSymb Min TypMaxUnitComment
Analog Source Resistance

12 bit mode f ADCK =

40MHz ADLSMP=0,
ADSTS=10, ADHSC=1

RAS1kohmsTsamp=150ns

RAS depends on Sample Time Setting (ADLSMP, ADSTS) and ADC Power Mode (ADHSC, ADLPC). See charts for Minimum Sample Time vs RAS.

Where can I find these "charts" with RAS vs. minimum sample time? What is the largest RAS value which the ADC can handle (at the lowest possible sampling time)?

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