The AD780 is an ultrahigh precision band gap reference voltage that provides a 2.5 V or 3.0 V output from inputs between 4.0 V and 36 V. Low initial error and temperature drift combined with low output noise and the ability to drive any value of capacitance make the AD780 an ideal reference voltage source for a variety of applications.
The AD780 provides a pin‑programmable 2.5 V or 3.0 V reference voltage from a 4 V to 36 V supply, with ultralow drift (3 ppm/°C) and low noise (4 mV p‑p from 0.1 Hz to 10 Hz). It can source or sink up to 10 mA and operate in series or shunt mode, making it suitable for high‑resolution ADC/DAC applications and as a temperature transducer.
A temperature output pin (Pin 3) delivers a voltage that varies linearly with temperature (≈2 mV/°C), allowing the device to be used as a temperature sensor. The part includes optional fine‑trim capability and can be used without external components when a 1 µF bypass capacitor is placed on the supply pin.
| Output Voltage (2.5 V mode) | Typical 2.505 V |
|---|---|
| Output Voltage (3.0 V mode) | Typical 3.005 V |
| Output Voltage Drift (‑40 °C to +85 °C) | 7 ppm/°C |
| Load Regulation (Series mode, sourcing 0‑10 mA) | 50 µV/mA |
| Quiescent Current (2.5 V mode) | Typical 700 µA at 5 V, max 1 mA |
| Short‑Circuit Current to Ground | 30 mA |
| Maximum Supply Voltage | 36 V |
The AD780 has a pin‑programmable output of either 2.5 V or 3.0 V.
Typical quiescent current is about 700 µA at a 5 V supply, with a maximum of 1 mA.
Pin 3 (TEMP) provides a voltage that varies linearly with temperature, about 2 mV per degree Celsius.
The device is rated for up to 36 V from the supply pin to ground.