AN4207

Overview of 16-bit SDADC

Doc ID 023945 Rev 1

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Figure 4.

Input signal range in single ended offset mode

Single ended zero reference mode

The signal is applied to the positive input SDADCx_AINyP, and the negative input is set to

the signal reference (normally 0 V). This mode injects an input common mode of half scale

to the ADC thus maintaining the dynamic range the same as in differential mode (-32767 to

+32767). In this mode, the injected common mode is dependent on gain variations.

The formula is:

Vin = SDADCx_AINyP = (ReadData + 32767) * Vref/(gain x 65535)

with ReadData is two’s complement read data from SDADC data register

(SDADCx_JDATAR or SDADCx_RDATAR)

SDADCx_AINyP

Vref/(2xgain)

MSv31130V1