Overview
The ADR291ERZ is a low noise, micropower precision voltage reference from Analog Devices Inc. It utilizes the XFET reference circuit, offering significant performance improvements over traditional band gap and buried Zener-based references. This device is part of the ADR291/ADR292 family, known for its stable and accurate output voltages, low thermal hysteresis, and excellent long-term stability. The ADR291ERZ is particularly suited for battery-powered instrumentation due to its low quiescent current of 12 μA and high accuracy.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (VOUT) | IOUT = 0 mA | 2.493 | 2.5 | 2.507 | V |
| Initial Accuracy (VOERR) | IOUT = 0 mA | -2 | - | 2 | mV |
| Temperature Coefficient | -40°C to +125°C | - | - | 8 ppm/°C (E Grade), 15 ppm/°C (F Grade), 25 ppm/°C (G Grade) | - |
| Supply Voltage Range | - | 2.8 | - | 15 | V |
| Quiescent Current | -40°C ≤ TA ≤ +125°C | - | 12 | 15 | μA |
| Line Regulation | ΔVOUT/ΔVIN, IOUT = 0 mA | - | - | 30 ppm/V (E/F Grades), 40 ppm/V (G Grade) | - |
| Load Regulation | ΔVOUT/ΔILOAD, VS = 5.0 V, IOUT = 0 mA to 5 mA | - | - | 30 ppm/mA (E/F Grades), 20 ppm/mA (G Grade) | - |
| Noise (0.1 Hz to 10 Hz) | - | - | 8 μV p-p (E Grade), 12 μV p-p (F/G Grades) | - | |
| Output Current | - | - | - | 5 | mA |
| Package | - | - | - | 8-Lead SOIC, 8-Lead TSSOP, 3-Lead TO-92 | - |
Key Features
- Low noise: 8 μV and 12 μV p-p (0.1 Hz to 10 Hz)
- Low quiescent current: 12 μA maximum
- High accuracy: Initial output accuracies of ±2 mV, ±3 mV, and ±6 mV maximum
- Low thermal hysteresis and excellent long-term stability
- Wide supply voltage range: 2.8 V to 15 V
- High output current: Up to 5 mA
- Extended industrial temperature range: -40°C to +125°C
Applications
The ADR291ERZ is ideal for various applications, including:
- Battery-powered instrumentation due to its low power consumption.
- Analog-to-digital and digital-to-analog converters, particularly those requiring low supply voltages.
- Portable equipment and handheld devices where low power and high accuracy are crucial.
- High voltage floating current sources and Kelvin connections.
- Voltage regulators for low power, low voltage systems.
Q & A
- What is the output voltage of the ADR291ERZ?
The output voltage of the ADR291ERZ is 2.5 V. - What is the quiescent current of the ADR291ERZ?
The quiescent current is only 12 μA. - What are the available package options for the ADR291ERZ?
The device is available in 8-Lead SOIC, 8-Lead TSSOP, and 3-Lead TO-92 packages. - What is the temperature range for the ADR291ERZ?
The device is specified over the extended industrial temperature range of -40°C to +125°C. - What are the key improvements of the XFET architecture used in the ADR291ERZ?
The XFET architecture offers lower voltage noise, very low and ultralinear temperature drift, low thermal hysteresis, and excellent long-term stability compared to traditional band gap and buried Zener-based references. - What is the maximum output current of the ADR291ERZ?
The maximum output current is 5 mA. - How accurate is the ADR291ERZ in terms of initial output accuracy?
The initial output accuracies are ±2 mV, ±3 mV, and ±6 mV maximum for different grades. - What are some typical applications of the ADR291ERZ?
Typical applications include battery-powered instrumentation, analog-to-digital and digital-to-analog converters, portable equipment, and voltage regulators for low power systems. - What is the line regulation of the ADR291ERZ?
The line regulation is typically 30 ppm/V for E/F Grades and 40 ppm/V for G Grade. - What is the noise performance of the ADR291ERZ?
The noise performance is 8 μV and 12 μV p-p (0.1 Hz to 10 Hz) for different grades.
