Overview
The ADR291FRZ is a low noise, micropower precision voltage reference produced by Analog Devices Inc. It utilizes the XFET® reference circuit, which offers significant performance improvements over traditional band gap and buried Zener-based references. This device is part of the ADR291 and ADR292 family, known for their high accuracy, low noise, and excellent long-term stability.
The ADR291FRZ provides a stable output voltage of 2.5 V and is designed to operate from supply voltages as low as 2.8 V, making it suitable for battery-powered instrumentation and low-power applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (VOUT) | IOUT = 0 mA | 2.48 | 2.5 | 2.52 | V |
| Initial Accuracy (VOERR) | IOUT = 0 mA | - | - | ±2 mV, ±3 mV, ±6 mV | mV |
| Temperature Coefficient | - | - | - | 8 ppm/°C, 15 ppm/°C, 25 ppm/°C | ppm/°C |
| Line Regulation (∆VOUT/∆VIN) | IOUT = 0 mA | - | - | 30 ppm/V | ppm/V |
| Load Regulation (∆VOUT/∆ILOAD) | VS = 5.0 V, IOUT = 0 mA to 5 mA | - | - | 30 ppm/mA | ppm/mA |
| Quiescent Current (IS) | TA = 25°C | - | 12 μA | 15 μA | μA |
| Operating Temperature Range | - | -40°C | - | +125°C | °C |
| Package | - | - | - | 8-lead SOIC, 8-lead TSSOP, 3-lead TO-92 | - |
Key Features
- Low Noise: The ADR291FRZ features low noise output, with voltage noise significantly reduced compared to traditional band gap references.
- High Accuracy: Initial output accuracies of ±2 mV, ±3 mV, and ±6 mV maximum, ensuring precise voltage reference.
- Low Power Consumption: Quiescent current of only 12 μA, making it ideal for battery-powered devices.
- Excellent Temperature Stability: Very low and ultralinear temperature drift with coefficients of 8 ppm/°C, 15 ppm/°C, and 25 ppm/°C maximum.
- 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.
Applications
- Battery-Powered Instrumentation: Ideal for handheld, battery-operated equipment due to its low power consumption and high accuracy.
- Analog-to-Digital and Digital-to-Analog Converters: Suitable for use with data converters that require a precise and stable voltage reference, such as the AD7701 16-bit ADC.
- Portable Equipment: Used in voltage regulators for portable devices where low power and high accuracy are crucial.
- High Voltage Floating Current Source: Can be used in applications requiring a stable voltage reference for high voltage floating current sources.
- Low Power, Low Voltage Systems: Ideal for systems that operate on low supply voltages without compromising on performance.
Q & A
- What is the output voltage of the ADR291FRZ?
The output voltage of the ADR291FRZ is 2.5 V.
- What is the minimum supply voltage required for the ADR291FRZ?
The minimum supply voltage required is 2.8 V.
- What is the quiescent current of the ADR291FRZ?
The quiescent current is only 12 μA.
- What are the available package options for the ADR291FRZ?
The device is available in 8-lead SOIC, 8-lead TSSOP, and 3-lead TO-92 packages.
- What is the operating temperature range of the ADR291FRZ?
The operating temperature range is −40°C to +125°C.
- What are the initial output accuracy options for the ADR291FRZ?
The initial output accuracies are ±2 mV, ±3 mV, and ±6 mV maximum.
- How much output current can the ADR291FRZ deliver?
The device can deliver up to 5 mA of output current.
- What are the typical line and load regulation values for the ADR291FRZ?
The typical line regulation is 30 ppm/V, and the load regulation is 30 ppm/mA.
- Is the ADR291FRZ suitable for use with analog-to-digital converters?
Yes, it is highly suitable due to its low noise, high accuracy, and low power consumption.
- What is the significance of the XFET® architecture in the ADR291FRZ?
The XFET® architecture offers significant performance improvements over traditional band gap and buried Zener-based references, including lower noise and better temperature stability.
