--- In "j.chitte" <> wrote:
>
> Hi,
>
> On my 7250 I have an R2R network DAC running of 4 bits of portA .
> This is far more linear than I expected from such a simple
circuit.
> An on screen plot looks as straight as a die.
>
> However , I am monitoring it with one channel of the MAX ADC
> and there is some very bad distortion of the values it returns.
>
> http://piments.com/holding/badDAC.svg
>
> I have verified the voltage my circuit is presenting at the header
> pin going to the 7250 and it is as expected for all values.
>
> I am reading it with a modified adc_logger so the guts of the IO
is
> pretty simple and close to ts7200io.c
>
> Is this the question of calibration that was mentioned earlier in
> relation to these boards?
>
> TIA.
>
Anyone have any idea what this gross distortion is about?
If I run this on range 3 (0-5V) it bigger and uglier and right in the
area where I need results.
TIA.
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