Hello, we are designing a circuit implementing the LTC2495 ADC. We have connected Vref+ to 5V and Vref- to GND. the COM pin is also grounded.
We are having issues measuring voltages above 2.5V. Whenever we doo, we get the 110000 error code and no voltage data from the ADC.
We already checked the data transmission, it sending the correct bus of data command to the ADC for Single Ended mode. We also checked and it can measure relatively correctly voltages under 2.5 V and above 0 V. We are also noticing that if we try to connect an ADC channel pin to GND, it loops back and returns 2.499V instead of 0V on the measurement.
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We can assure that it isn't a coding issue, as the firmware and library code we are using in Python thru a CM4 from Raspberry send the correct data bus and is able to configure the ADC to return data. It is simple marking voltages above 2.5V as over range, yet we are not sure why, since we are using a Vref of 2.5V and a grounded COM
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Image privacy[edited by: JCoboN3 at 6:02 PM (GMT -4) on 22 Sep 2025]