about ADC sampling clock-2

[goto11]

hello,

Table 93. Recommended operating conditions for 12-bit ADC in .MX 7 Dual Family of Applications Processors Datasheet
Is it OK to make the RIEXT value larger than 250Ω (for example, from several kΩ to dozens of kΩ) when FCLK and FSOC are operated at close Min values?

What kind of problems will occur if the resistance value is increased?

best regards

Goto

[igorpadykov · Accepted solution]

Hi Goto

>Is it OK to make the RIEXT value larger than 250Ω..

not, sorry.

>What kind of problems will occur if the resistance value is increased?

it may affect measurement accuracy, details can be found on web, for example :

Required output impedance for ADC input? - Electrical Engineering Stack Exchange 

Best regards
igor
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