Fixed 1.25 V shunt reference for precision bias and ADC/DAC rails
The MAX6006BEUR+T is a shunt voltage reference from Analog Devices delivering a fixed 1.25 V output with ±0.5% initial tolerance. Shunt topology means it operates like a Zener diode in parallel with the load — no external pass transistor, just a current-limiting resistor from the supply rail. The cathode current floor is 1 µA, so the reference can be biased from a very low supply current budget — useful in battery-powered or loop-powered sensor transmitters.
Temperature drift and tolerance budget for industrial-range designs
That is within the LSB budget of a 10-bit ADC with a 2.5 V reference, but for a 12-bit system the drift alone consumes ~9 LSBs — plan for calibration or a tighter-tc part. The ±0.5% initial tolerance adds another 6.25 mV of absolute error at 25°C. Combined with drift, the worst-case output at 85°C could be 1.244 V ± ~12 mV — acceptable for comparator thresholds and 8-bit references, but verify against your system accuracy budget.
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Shunt reference — resistor sizing and load current limits
Maximum output current is 2 mA. The series resistor from supply to the reference cathode must be chosen so that the current through the reference stays between 1 µA and 2 mA over all load and supply conditions. A common rule: set the resistor for 1 mA quiescent current at nominal supply, then verify at min supply and max load. Surface-mount assembly on standard SOT-23-3 land pattern. No exposed thermal pad — the junction-to-ambient thermal resistance is set by the copper area on the cathode pin. For 2 mA continuous output, a 12 mil trace to a 25 mm² copper island keeps the die temperature rise under 15°C.