This document describes the ADR430/ADR431/ADR433/ADR434/ADR435/ADR439 series ultralow noise XFET voltage reference circuits with current sink and source capability. They feature low noise, low temperature coefficient, wide operating range, and high output current. They are suitable for precision data acquisition systems, high resolution data converters, medical instruments, industrial process control systems, optical control circuits, and precision instruments.
The ADR430, ADR431, ADR433, ADR434, ADR435, and ADR439 are part of the ADR43x family of XFET voltage references from Analog Devices. These devices feature low noise performance (down to 3.5 pV p-p), high output source and sink current capabilities (+30 mA and -20 mA respectively), and a wide operating temperature range of -40°C to +125°C.
The datasheet provides detailed electrical characteristics, pin configurations for 8-lead MSOP and narrow SOIC packages, and application information. Key features include low temperature coefficients (A Grade: 10 ppm/°C max; B Grade: 3 ppm/°C max), no external capacitor requirement, and the ability to source or sink current directly from the output pin.
| Low noise (0.1 Hz to 10.0 Hz) | 3.5 pV p-p @ 2.5 V output |
|---|---|
| Temperature coefficient A Grade | 10 ppm/°C maximum |
| Temperature coefficient B Grade | 3 ppm/°C maximum |
| Load regulation | 15 ppm/mA |
| Line regulation | 20 ppm/V |
| Output source current | +30 mA |
| Operating temperature range | -40°C to +125°C |
No, these voltage references do not require an external capacitor.
The devices are available in 8-lead MSOP and 8-lead narrow SOIC packages.