What does “ratiometric” mean?
This feature is particularly valuable when using the ACS750 with an analog-to-digital converter. A/D converters typically derive their LSB from a reference voltage input. If the reference voltage varies, the LSB will vary proportionally. The ratiometric feature of the ACS750 means its gain and offsets are proportional to its supply voltage, VCC. If the reference voltage and the supply voltage for the ACS750 are derived from the same source, the ACS750 and the A/D converter will both track those variations, and such variations will not be a source of error in the analog-to-digital conversion of the ACS750’s output.
