On 10/6/05, Wouter van Ooijen <wouter@voti.nl> wrote:
> > I'm using a PIC16F88 with an ADXL322 board for accelerometer readings
> > (yes, I have the suggested filtering capacitors in place.)
>
> Which value are the caps?
>
> And I dunno the 322, but with the 311 the internal resistors are far
> larger than the recommended (required?) source impedance for the F88 A/D
> (either 10k or 2k5, depends on the part of the datasheet you take).

The biggest shit with PIC's AD is the missing of a good internal
layout for the analogic and digital ground (and analogic and digital
+VDD supply). Everything you can do, is to mix in a convenient way
these two, but outside the PIC package.
If you have played a little with Maxims high speed AD converters you
know how important is to keep the analog voltage slighty above the
digital one.

Vasile

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