ADR1581 is a 1.25 V micropower, precision shunt voltage reference produced by Analog Devices. It has wide operating range, low initial accuracy, low temperature drift, low output impedance, low wideband noise and high ESD. It is widely used in portable, battery-powered equipment, cellular phones, notebook computers, PDAs, GPSs, DMMs, computer workstations, video RAMDACs, smart industrial transmitters, PCMCIA cards, and automotive.
The ADR1581 is a low‑cost, 2‑terminal precision shunt voltage reference that delivers a stable 1.250 V output over a wide operating current range (60 µA to 10 mA). It offers high accuracy, low temperature drift (±50 ppm/°C), and a compact SOT‑23‑3 surface‑mount package, making it suitable for battery‑powered devices, data converters, and industrial transmitters.
The document includes detailed specifications, absolute maximum ratings, typical performance curves, theory of operation, application guidelines, and ordering information. It also covers ESD protection (4 kV human‑body model, 400 V machine model) and noise performance (20 µV rms from 10 Hz to 10 kHz).
| Reverse Voltage Output (typical) | 1.250 V |
|---|---|
| Reverse Voltage Temperature Drift | 50 ppm/°C |
| Minimum Operating Current | 60 pA |
| Reverse Voltage Change with Reverse Current (typical) | 25 mV |
| ESD Machine Model Rating | 400 V |
The device is specified to operate from –40 °C to +85 °C, with an absolute maximum range of –55 °C to +125 °C.