2.048 V fixed reference — the ADC/DAC reference anchor
The REF3020AIDBZTG4 from Texas Instruments is a series voltage reference that delivers a fixed 2.048 V output with ±0.2% initial tolerance.
Temperature range and noise floor
The 75 ppm/°C temperature coefficient means the output drifts about 0.15 mV over a 100°C swing — acceptable for 12-bit systems but a consideration for 16-bit designs. Output noise is 23 µVp-p from 0.1 Hz to 10 Hz and 65 µVrms from 10 Hz to 10 kHz, low enough to avoid injecting significant jitter into a SAR ADC reference input.
SOT-23-3 package and sourcing posture
Housed in a SOT-23-3 (TO-236-3 / SC-59) surface-mount package, the REF3020AIDBZTG4 fits a compact three-pin footprint.