The ADS131B04-Q1 uses an internally generated, low-drift, band-gap voltage to supply the reference for the ADC. The reference has a nominal voltage of 1.2 V, allowing the differential input voltage to swing from –1.2 V to 1.2 V at Gain = 1. The reference circuitry starts up very quickly to accommodate the fast start-up feature of this device. The device waits until after the reference circuitry is fully settled before generating conversion data.