Rearranged reference helps ADC measure its own supply voltage


Posted on Oct 29, 2012

If you use an ADC to monitor a system`s power-supply voltage, you may encounter situations in which the supply voltage exceeds the ADC`s reference voltage (Figure 1). However, the ADC`s input voltage cannot exceed its reference voltage. You can use an external resistive divider to bring the supply voltage within the ADC`s input range, but even 0.1%-tolerance resistors may introduce an objectionable error.






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