ZHCSH90A January 2015 – December 2017 VSP5324-Q1
PRODUCTION DATA.
For normal operation, the device requires two reference voltages, REFT and REFB. By default, the device generates these two voltages internally. To enable the external reference mode, set the register bits as listed in Table 5. This procedure powers down the internal reference amplifier and the two reference voltages can be forced directly on the REFT and REFB pins as (V(REFT) = 1.45 V ± 50 mV) and (V(REFB) = 0.45 V ±50 mV).
Use to calculate the relationship between the ADC full-scale input voltage (VFS) and the applied reference voltages.