Precision 2.048V anchor for ADC/DAC reference rails
The MAX6126BASA21+ is a series voltage reference from Analog Devices, delivering a fixed 2.048V output with ±0.06% initial tolerance. That 2.048V level is a natural fit for bipolar ADC ranges — a 0-to-2.048V input maps cleanly to a 12-bit converter's 0.5 mV LSB without scaling resistors.
Noise and load drive — what the numbers mean for your signal chain
For a 16-bit converter with a 2.048V reference, that noise contributes less than 1 LSB of uncertainty at the LSB size of 31.25 µV. The part can source or sink up to 10 mA of output current. That is enough to drive multiple ADC reference inputs or a small buffer stage without loading the reference voltage. Supply current draw is 725 µA typical, so the reference's own power consumption stays well below the signal-chain budget. The series topology means the output tracks the input as long as the input stays above 2.7V plus dropout.
Package, footprint, and field-swap reality
Pin 1 orientation is marked by a notch on the package body — visible under a desk lamp, so you can orient it without a magnifier on a rework bench. Supplied in a tube — not tape-and-reel. For a prototype run or a rework kit, the tube keeps the parts aligned and ESD-safe. No moisture-sensitive-bake required unless the tube seal has been broken for months in a humid environment.
RoHS3 compliant.