Ryan Starret

QG8 ADC Woes...

Discussion created by Ryan Starret on Jan 27, 2007
Latest reply on Jan 28, 2007 by Ryan Starret
I'm really just looking for some input...

I am using the ADC on the chip and it seems to work fine. If I hook a couple of AA batteries up to it the reading fluctuates at most +/-1 between each reading. if I attach ground to it I get a zero back every time and if I plug the demo board power into it I get 1023 steadily as well.

Problem comes in when I try to hook just about anything else up to it... I have an accelerometer from dimension engineering that when it's still it outputs 1.566-1.567V. I can watch it on the multimeter. However, these fluctuations translate into reading changes on the ADC within about 20 points of the actual reading. Just doing some quick math I found that it should fluctuate at most by 1. Same thing happens when I use an ADI Gyro. I was wondering if anyone had an insight as to how to either flatten these fluctuations (without averaging... mainly because it doesn't seem to help whatsoever) or eliminate them altogether.

Thanks.

Ryan

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