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Choosing_OPAMP_to_drive_ADC.php   7890 Bytes    30-12-2015 17:50:08


Choosing the right OPAMP to drive an ADC


Suiteable for SAR ADC • Successive approximation ADC





OPAMP DRIVING AN ADC



Analog to Digital Converters do switch capacitances at the input whilst converting. In order to have a stable conversion, it is mandatory to use a low impedance circuit to drive their input. This tool let's you "see" what specifications your opamp and your R-C-Lowpass should have.



 ADC

Resolution

Bits

 

Acquisition Time

ns

 

Input capacitance

pF

(in sampling mode)


 LOWPASS

RF

Ω

 

C1

pF

 

F0

MHz

Frequency of added zero.


 OPAMP

GBWP

MHz

Buffer, minimum value.

Output Resistance

Ω

Maximum value !






✈ Listen to Dwight Byrd & Luke Lapointe ...








✈ Notes




This is fully experimental ! No guarantee for anything.




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t1 = 3844 d

t2 = 551 ms

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