The 

 features 4 external analog-to-digital converter (ADC) input channels which allow your application to sample an analog voltage.

ADC samples are configured, initiated, and read manually; periodic or triggered-input sampling is not supported. The analog channel has several configurable parameters that determine its behavior.

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The following table lists the external input channels and the corresponding labels on the on the silkscreen of the 

 board:

The analog channel on 

 can be configured to provide accurate measurements of an analog input signal. The ADC itself has a scale from 0V to 1.8V, with a 10-bit resolution. Each LSB represents 1.8mV.

The Variable-Gain Amplifier (VGA) and offset Range-DAC (RDAC) provide improved resolution of analog input signals having less than full-scale input swing. Improved resolution is attained by zooming into a user-configured portion of the full 0 to 1.8V input range. To zoom into the desired input-voltage range, the RDAC value is first subtracted from the analog input signal; the result of this subtraction is then amplified by the VGA by a user-settable gain from 1 to 8. Zooming to the range of interest in this fashion allows the dynamic range of the ADC to be matched to the input signal to be digitized.

The RDAC is 4-bits and has sixteen equally-spaced, discrete offset ranges as follows:

The VGA has eight discrete gain settings as follows: