The first operation of the AFE is a sampling function relative to VDAC. VDAC is generated by an internal DAC0 or DAC1. All operations after the Sample-and-Hold are differential relative to an internal common mode voltage VCM = VVREFP/2.
In Differential mode, the Sample-and-Hold common mode voltage is equal to VDAC = VVREFP/2 (set by software DAC0 and DAC1 to code 512).
In Single-ended mode, VDAC is the common mode voltage. VDAC is the output of DAC0 or DAC1 voltage. All operations after the Sample-and-Hold are differential, including those in Single-ended mode.
For the formula example, the internal DAC0 or DAC1 is set for the code 512.
The DATA code in AFEC_CDR is up to 16-bit positive integer or two’s complement (signed integer).
The code does not exceed 4095 when the field AFEC_EMR.RES=0 (12-bit mode, no averaging).