How to adjust a ADC

Anonymous · ‎Oct 08, 2018

I have a question about how to adjust the ADC.

what should the setting be if you have to measure a
signal on an input that has a value between 3 and 4 volts.

And the required measurement accuracy must be 0.5mV.

odissey1 · ‎Oct 12, 2018

hmeijerink,

one way to accomplish this is to use ADC_SAR in differential mode, providing V(-) terminal with offset voltage 3.5V. To make full scale 1V, the ADC_SAR Vref voltage must be 500mv (full scale is 2xVref), which can be provided by VDAC. Schematic is attached. Note that due to the electrical noise in the system, the ADC reading fluctuate approx. 5-10 counts (full scale 4096), to get to 1-2 counts a low-noise power supply and caps required, plus some ADC averaging. P.S. What data acquisition rate you need?

/odissey1

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How to adjust a ADC

How to adjust a ADC

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