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Another ADC Question

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Wond3rboy

Member
Hi, continuing my trend of posting questions about the AD Module in PIC micros. Here's another one. I wanted know whether by using a voltage follower, we can use reduce the Acquisition time to the allowable lowest i-e not effected by impedance since Rin would be very less. I mean we can have sources of (nearly)any impedance. I think its right but just wanted to confirm first.

Thanks.
 

Pommie

Well-Known Member
Most Helpful Member
Yes, you can reduce the acqusition time by buffering the signal. You still have the internal resistance and settling time to allow for. See the relevant data sheet for the calculation.

If you have a signal that is not changing fast then you can reduce the acquisition time by simply using a capacitor from the pic pin to ground.

Mike.
 
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