Adjustable shunt reference for precision bias and regulation
It delivers a programmable output from 1.24V up to 5.3V, set by two external resistors, with a ±1% initial tolerance that sets the measurement uncertainty floor for the BOM.
What the cathode current and output rating mean for the circuit
The 55 µA minimum cathode current is the bias floor — the shunt regulator needs at least that much current through the device to stay in regulation. If the external load plus the programming resistor string draws less than 55 µA, add a pull-down resistor to keep the reference biased above the threshold. The 20 mA maximum output current sets the upper limit for the shunt current. The total current through the reference (cathode current plus load current) must stay under 20 mA, which is typical for low-power bias and monitoring circuits.
Temperature drift and noise floor for calibration work
The 30 ppm/°C temperature coefficient means the output voltage shifts by 30 parts per million per degree Celsius. For a 2.5 V output, that is about 20 ppm rms — clean enough for a 12-bit system but not for a 16-bit precision chain without post-filtering.