2.048V fixed reference — what the ±0.05% tolerance buys you
The REF5020ID is a precision series voltage reference from Texas Instruments that delivers a fixed 2.048V output with an initial accuracy of ±0.05%. That tolerance means the output sits between 2.046976V and 2.049024V at 25°C — tight enough to serve as the reference for a 12-bit SAR ADC without external trimming, and still within the error budget of many 16-bit delta-sigma converters when the system gain is calibrated once.
3ppm/°C drift and 3µVp-p noise — the stability story
That works out to about 1.2 mV of total drift from cold to hot — a figure that keeps the reference error below one LSB in a 12-bit system at 2.048V full-scale.
Input range and output drive — sizing the rail and the load
Output current is rated at 10 mA — enough to drive the reference input of multiple ADCs or a small resistive divider network without an external buffer. Quiescent supply current is 1.2 mA, which keeps the self-heating low in a sealed enclosure.
No official successor or second-source alternate is listed, so the BOM should be qualified with this exact part number.