AN2615 A high precision, low cost, single supply ADC for positive and negative input voltages
Introduction
In general the ADC embedded in the ST7 microcontroller is enough for most applications. But, in some cases it is necessary to measure both positive and negative voltages. This requires an external ADC with this particular capability. Most external ADCs require a dual supply to be able to do this. However, microcontroller-based applications usually only have a positive supply available.
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