3 V fixed output with 3 µVp-p noise — the ADC reference decision
The REF5030AIDG4 is a 3 V series voltage reference from Texas Instruments. Its 3 µVp-p noise over 0.1 Hz to 10 Hz and ±0.1% initial tolerance make it a fit for precision data-acquisition chains where the reference noise floor directly sets the ADC's effective resolution.
8 ppm/°C drift across the full industrial range
That means the output shifts less than 2.4 mV from a cold start to full temperature — a spec that matters for outdoor telecom or motor-drive control loops where the ambient varies by 60°C or more.
10 mA output and 1.2 mA supply current
Output can source or sink 10 mA, enough to bias an ADC reference input and a small resistive divider. Supply current is 1.2 mA, with a 3.2 V to 18 V input range — the part runs from a 5 V or 12 V rail without a separate LDO.