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ADC 0804 & DAC 0800 correct diagram

graigavern · 2008-08-21 15:22:44

Hi Folks, I'm using a national semi. data sheet and from one figure to the next they have the wiring different for each as in the ADC vcc pin 20, vin + pin 6 & pin 7 vin- which on the next figure has them as data inputs therefore the chip can't be powered, also the Vref is off. Am I looking at it wrong or what??? As for…

21-08-2008 04:22PM

#1

graigavern

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Join Date: June 2008

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Hi Folks,

I'm using a national semi. data sheet and from one figure to the next they have the wiring different for each as in the ADC vcc pin 20, vin + pin 6 & pin 7 vin- which on the next figure has them as data inputs therefore the chip can't be powered, also the Vref is off.
Am I looking at it wrong or what???
As for the DAC i'm kinda lost!!
Any idea's
Thanks

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#2 23-08-2008 08:45PM

DublinDilbert

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had a quick look at that data sheet, yea pins 7 & 6 are the differential inputs for the input voltage you are trying to measure. The IC is powered by the Vcc pin, pin 20, and the AGND / DGND pins.

It shouldn't be too difficult to wire up and get working... I used to use these back in the day connected up to a PC printer port, as i couldn't afford ADC cards.

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