On Mon, 8 Nov 1999, Darren Logan wrote:

>     When I go to read all 3 channels (in a loop), the value on the
> individual channels seems to affect the others. Example: If all channels
> are set for full scale, then all will read 255. But if I then gradually
> decrease one channel input, one or sometimes both the other channels
> will also decrease.

>     Any ideas how I can avoid this interaction of channels ?

  How much settling time on the sample/hold amp. in the chip are you
allowing between channels?  A channel has to be sampled for something like
12 microseconds before each conversion.  So, to minimize channel
crosstalk, you have to do something like:

  select chan 0
  allow sample time
  convert
  select chan 1
  allow sample time
  convert
  .
  .
  .
  loop back to select chan 0

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