SLAS986D November 2014 – February 2018 AMC7836
The AMC7836 device includes a high-performance internal reference for the on-chip ADC and 16 DACs (see Figure 58). The internal reference is a 2.5 V, bipolar transistor-based, precision bandgap reference. A compensation capacitor (4.7 μF, typical) should be connected between the REF_CMP pin and the AGND2 pin.
The AMC7836 device includes a buffer to drive the ADC and should not be used to drive any external circuitry. The ADC reference buffer is powered down by default and should be enabled in the ADC configuration register (address 0x10) during device initialization.
The internal reference is typically established after power-up in less than 5 ms at TA = 25°C however the reference settling time is highly dependent on temperature. Figure 59 shows typical reference settling time as a function of temperature.