Lpc2000

Many reasons could be for that, first let me know witch type is your A/D converter? SAR Sigma Delta? and who is manufucter of that ADC.
 
do you have buffered imputs with amplifires?
how many digits of readings are unstable?

Leighton Rowe <leightonsrowe@...> wrote:

I need a little advice with using external ADC's with lpc 
processors. 

Apparently, the reference, analog ground, and input signals looks 
somewhat distorted (spiky) on the oscilloscope whenever the 16-bit 
(unipolar) Converter is busy converting. As a result, the readings 
don't come out as consistent as it should (even when both inputs are 
grounded). Is there any way to avoid this problem?




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