AnsweredAssumed Answered

DAC output changes ADC reading

Question asked by bridges.daniel on May 21, 2014
Latest reply on May 30, 2014 by bridges.daniel
Hi,

I'm using the STM32F4 Discovery board. I have a program that outputs voltages with the onboard DAC and reads voltages with the ADC. For some reason when the DAC is outputs a voltage it lowers the readings of the ADC slightly. This happens even if the DAC output is left unconnected. I've verified with a voltmeter that the actual voltage on the ADC does not change, so it seems like something internal. VDD also does not appear to change. 

Any tips?

Thanks!

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