Input impedance of ADC and its matching with source

Thread Starter

mishra87

Joined Jan 17, 2016
540
What is role of input impedance of ADC.
What if source impedance don't match with input impedance of ADC.
Could any explain effect and cause of input impedance of ADC.

Thanks !!!
 

OBW0549

Joined Mar 2, 2015
2,985
What is role of input impedance of ADC.
It doesn't have a "role"; it's a characteristic of the ADC that can cause conversion errors when the ADC is driven by a signal source whose own impedance is a significant fraction of the ADC input impedance.

What if source impedance don't match with input impedance of ADC.
The concept of "matching" has no relevance here. for minimum error keep the signal source impedance as low as possible, and the ADC input impedance as high as possible.

Could any explain effect and cause of input impedance of ADC.
See above.

The data sheets for microcontrollers that have built-in ADCs usually give abundant information on the causes and effects of ADC input impedance. Read the data sheet!
 
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