ADS7828: ADS7828

Hi Joshua,

You can measure the internal reference at pin 10 of the ADS7828.  That should still be a stable 2.5V source even if your Vdd supply varies by +/-100mV.  What does your schematic look like on the ADC inputs?  Do you have any buffers ahead of the analog inputs?

Hi Tom, thank you for responding I hope I can use your advice. I looked at the data sheet though and I am unsure how to do measure pin 10? Using page 11 from the datasheet, how are we able to address pin 10's voltage? I only see how you can ask for Ch0-Ch7 voltages.

I was thinking you would measure the reference voltage at pin 10 with a multi-meter.  The reference does not have direct input to any of the channels.

Gotcha! If I turn on the reference voltage pin will all of my ADC channels need to be below the 2.5V?

The input range for the ADS7828 is 0-Vref, so if you use the internal 2.5V reference, any input above 2.5V will clamp at the full-scale code.