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#1 2010-07-13 10:21:18

bgeorge98121
New member

ADC

I'm having ADC problems.  There seems to be a lot of noise coming from the ADC pins.  I have a single Hall Effect sensor output going to pins 1, 2 and 3 and the I'm getting up to 30 CV differences between the readings.  There seems to be a lot of noise being generated on pins 1-8 even when nothing is connected.

I'm also monitoring the output of the Hall sensor with a Fluke bench meter, ant it is showing +- .1mv drift which is way inside the sensitivity of the ADC as I figure it, is around 20mv per CV.

Is there a fix?

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#2 2011-10-18 10:02:35

gremlinc5
Member

Re: ADC

As I see you need a voltage regulator and a differential input opamp, like:

http://content.honeywell.com/sensing/pr … apter2.pdf

How do you connected the sensor?

ADCs are ok, they function properly.


ST7FLite39 daughter board
REva 2.10
RLink 3.4
"uChameleon" as: SPI Master for debug, Analog output for sensing emulation

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