Voltage References

AD780ARZ-REEL7

AD780ARZ-REEL7 - 2.5V/3.0V High Precision Reference | Analog Devices

The AD780ARZ-REEL7 from Analog Devices is an ultrahigh precision band gap voltage reference that provides a programmable output of either 2.5V or 3.0V with exceptional accuracy and stability. Housed in an 8-pin SOIC package, this device is designed for high-performance applications requiring a stable and precise voltage reference. The AD780 offers a temperature coefficient as low as 3 ppm/°C (grade A) and initial accuracy of ±0.2% (grade A), ensuring reliable performance across a wide temperature range. With a low output noise of 4 µV p-p (0.1 Hz to 10 Hz) and a wideband spectral noise density of 100 nV/√Hz, the AD780 is ideal for noise-sensitive applications such as precision data converters, instrumentation, and industrial control systems. A voltage reference is a crucial component in analog and mixed-signal systems, providing a stable and accurate voltage that serves as a benchmark for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and comparators. The AD780 belongs to the category of series voltage references, which regulate output voltage by controlling the current through a pass element, offering low output impedance and excellent load regulation. This makes it suitable for driving dynamic loads without significant voltage droop. Key features of the AD780 include a programmable output voltage (2.5V or 3.0V), a wide supply voltage range (up to 36V), and a maximum output current of 10 mA. The device also includes a temperature output pin that can be used as a temperature transducer, providing a voltage proportional to temperature. The AD780 is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680, offering improved specifications and reliability. Technically, the AD780 utilizes a band gap architecture with laser-trimmed thin-film resistors to achieve high accuracy and low drift. The device operates over a temperature range of -40°C to +85°C (grade A) and is available in multiple grades (A, B, C) with varying accuracy and temperature coefficient specifications. The AD780 also features low quiescent current, making it suitable for battery-powered applications. Typical applications include precision data acquisition systems, high-resolution ADCs and DACs, industrial process control, and portable instrumentation. The AD780's low noise and high stability make it an excellent choice for reference designs in medical devices, automotive electronics, and communication systems. When designing with the AD780, it is important to place a 0.1 µF bypass capacitor close to the VIN pin and a 1 µF capacitor on the output to ensure stability. Additionally, the temperature output pin can be used for temperature sensing, but care must be taken to avoid loading it excessively.