3V fixed reference for low-power precision rails
The MAX6129BEUK30+T is a series voltage reference from Analog Devices that delivers a fixed 3V output with ±1% initial accuracy. It draws only 6.75 µA from the supply while sourcing up to 4 mA to the load — a combination that makes it suitable for battery-powered sensor nodes and portable instrumentation where every microamp counts. The series topology means the load current comes from the input, not from a resistor divider — output stays at 3V even when the load varies, unlike a shunt reference.
Noise floor and temperature drift for ADC reference duty
For a 12-bit ADC with a 3V reference, the noise contribution from the reference alone stays well under 1 LSB — the ADC's own quantization noise will dominate. The 100 ppm/°C temperature coefficient means the output shifts about 0.3 mV over a 10°C change, which is roughly 0.4 LSB at 12 bits. Operating temperature range is -40°C to +85°C, covering industrial enclosures and outdoor equipment that sees seasonal swings.