The REF5030IDGKR is a Texas Instruments series voltage reference that delivers a fixed 3V output with ±0.05% initial tolerance and a 3ppm/°C temperature coefficient. The 3µVp-p noise from 0.1 Hz to 10 Hz is low enough that the reference itself is not the dominant noise source in a 16-bit SAR ADC chain — the ADC's own noise floor or the input driver will likely set the system limit. The 10 mA output current can drive the reference input of multiple ADCs or DACs simultaneously, so you can share one reference across several converters without adding a buffer.
The input voltage range of 3.2V to 18V means it works from a 5V rail or a 12V unregulated supply — no separate pre-regulator needed. The 1.2mA quiescent supply current is low enough that the reference does not dominate the power budget in a battery-powered system.
The small footprint fits tight analog front-end layouts. The supplier device package is 8-VSSOP — the same mechanical outline as the MSOP-8, so the PCB footprint is standard across the REF50xx family.