Hello Ryan,
Is there a correct closed form expression for the ADS1271 code scale factor
something like:
ADC_Code = 2^22 * (AINP - AINN) / (VREF+ - VREF-)
thus that the verbal description in the datasheet is realized in numerical representation of the ADS1271's operation???
verbal descrpition of ADS1271 output code scale factor operation
The ADS1271 measures the differential input signal
VIN = (AINP – AINN) against the differential reference
VREF = (VREFP – VREFN). The most positive measurable
differential input is +VREF, which produces the most
positive digital output code of 7FFFFFh. Likewise, the
most negative measurable differential input is −VREF,
which produces the most negative digital output code of
800000h.
While the ADS1271 measures the differential input signal,
the absolute input voltage is also important. This is the
voltage on either input (AINP or AINN) with respect to
AGND. The range for this voltage is:
−0.1V < (AINN or AINP) < AVDD +0.1V
Thanks, Tom Acquistapace
