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ADC Sampling

 
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ADC Sampling
PostPosted: Tue Jul 08, 2008 6:03 pm     Reply with quote
Im using a PIC18F25j10, if that is relevant.

Im using the PIC to read 4 voltages off of a quad photodiode. Is it possible to sample and hold all 4 voltages simultaneously, and then convert them one at a time?

I suspect that Ill need an external quad sample and hold ic, but wondered if this was possible with just a PIC.
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Tue Jul 08, 2008 7:27 pm     Reply with quote
All the PICs that I am aware of have a MUX feeding a single A/D, so you can not simultaneously sample 4 inputs. You have to select an input, wait a settling time, then read the A/D, then select the next input.
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