Figure 8-3 shows the use of the OPAx863A as a SAR ADC input driver driving the .ADS7057 sensors, which are used for interface with the physical environment, exhibit high output impedance, and cannot drive SAR ADC inputs directly. A wide-GBW amplifier, such as the OPAx863A, is needed to charge the switching capacitors at the SAR ADC input, and quickly settle to the required accuracy within the given acquisition time. The OPAx863A wide-GBW, high precision performance enables fast settling, high accuracy sensor measurements, and reference buffering for precision ADCs.

Figure 8-3 OPAx863A as a Precision SAR ADC Driver