5 V reference with ±0.05% tolerance — the spec that decides the measurement chain
That tolerance is the first thing a calibration tech checks when a board comes back from the burn-in chamber — if the reference is off by more than that at 25 °C, the ADC's full-scale error budget is already blown before the converter sees a signal.
3 ppm/°C drift — what it buys you across the temperature range
For a 16-bit ADC with a 5 V reference, that drift eats roughly 0.5 LSB of the error budget — acceptable for most industrial measurements, but if you are chasing 18-bit effective resolution, you will want to characterise the actual drift on a per-part basis.
This is the noise that lands in the same passband as a precision weigh-scale or thermocouple measurement. At 3 µVp-p, the reference contributes about 0.4 LSB of peak-to-peak noise to a 16-bit system — the converter's own noise will dominate, not the reference.
Input range and output current — sizing the supply rail
The REF5050IDRG4 requires an input voltage between 5.2 V and 18 V. The 10 mA output current rating is enough to bias a handful of ADC reference inputs or a small resistive divider, but not enough to power downstream active circuitry — plan a separate LDO for the analog supply rail. The quiescent current is 1.2 mA, which matters for loop-powered 4-20 mA transmitters where every milliamp is budgeted.
Supplied in Tape & Reel on an 8-SOIC package (0.154-inch body width, 3.90 mm).