Overview
The ADR291GR, produced by Analog Devices Inc., is a low noise, micropower precision voltage reference that utilizes the XFET® reference circuit. This device offers significant performance improvements over traditional bandgap and buried Zener-based references, including lower voltage noise, very low and ultralinear temperature drift, low thermal hysteresis, and excellent long-term stability. The ADR291GR is part of the ADR291 family, which provides stable and accurate output voltages from supplies as low as 2.8 V. It is particularly suited for battery-powered instrumentation due to its low quiescent current of 12 μA and high output current capability of 5 mA.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Voltage - Output (Min/Fixed) | 2.5 V | V |
| Voltage - Input | 2.8 V to 15 V | V |
| Initial Accuracy | ±2 mV, ±3 mV, ±6 mV | mV |
| Temperature Coefficient | 8 ppm/°C, 15 ppm/°C, 25 ppm/°C | ppm/°C |
| Supply Current | 12 μA (max) | μA |
| Output Current | 5 mA (min) | mA |
| Operating Temperature | -40°C to +125°C | °C |
| Noise (0.1 Hz to 10 Hz) | 8 μV p-p | μV p-p |
| Line Regulation | 30 ppm/V (typ) | ppm/V |
| Load Regulation | 30 ppm/mA (typ) | ppm/mA |
| Package | 8-Lead SOIC, 8-Lead TSSOP, 3-Lead TO-92 |
Key Features
- Low noise: Offers significantly lower voltage noise compared to traditional bandgap references, with 8 μV p-p noise from 0.1 Hz to 10 Hz.
- High accuracy: Initial output accuracies of ±2 mV, ±3 mV, and ±6 mV, ensuring precise voltage reference.
- Low power consumption: Quiescent current of only 12 μA, making it ideal for battery-powered applications.
- High output current: Capable of delivering up to 5 mA of output current.
- Wide operating temperature range: Specified over the extended industrial temperature range of -40°C to +125°C.
- Low thermal hysteresis and excellent long-term stability: Ensures reliable performance over time.
Applications
- Portable instrumentation: Ideal for handheld, battery-operated equipment due to its low power consumption and high accuracy.
- Precision reference for 3 V and 5 V systems: Suitable for use with analog-to-digital and digital-to-analog converters that operate on low voltage supplies.
- Solar powered applications: The low power consumption makes it suitable for solar-powered devices.
- Loop-current powered instruments: Can be used in applications where power is derived from the signal loop.
- Data converters: Particularly suited for use with converters like the AD7701 due to its low noise and high accuracy.
Q & A
- What is the output voltage of the ADR291GR?
The output voltage of the ADR291GR is 2.5 V.
- What is the input voltage range for the ADR291GR?
The input voltage range for the ADR291GR is from 2.8 V to 15 V.
- What is the quiescent current of the ADR291GR?
The quiescent current of the ADR291GR is 12 μA (maximum).
- What is the operating temperature range of the ADR291GR?
The operating temperature range of the ADR291GR is -40°C to +125°C.
- What are the available package options for the ADR291GR?
The ADR291GR is available in 8-Lead SOIC, 8-Lead TSSOP, and 3-Lead TO-92 packages.
- What is the noise performance of the ADR291GR?
The noise performance of the ADR291GR is 8 μV p-p from 0.1 Hz to 10 Hz.
- What are the typical line and load regulations of the ADR291GR?
The typical line regulation is 30 ppm/V, and the typical load regulation is 30 ppm/mA.
- What are some common applications of the ADR291GR?
Common applications include portable instrumentation, precision reference for 3 V and 5 V systems, solar powered applications, and loop-current powered instruments.
- How does the ADR291GR compare to traditional bandgap references?
The ADR291GR offers significantly lower voltage noise, lower and ultralinear temperature drift, low thermal hysteresis, and excellent long-term stability compared to traditional bandgap references.
- What is the maximum output current of the ADR291GR?
The maximum output current of the ADR291GR is 5 mA.
