Overview
The ADR391AUJZ-REEL7 is a precision 2.5V micropower voltage reference produced by Analog Devices Inc. This component is part of the ADR39x family, which features low power consumption and high precision in a compact footprint. The ADR391 utilizes patented temperature drift curvature correction techniques, resulting in a low temperature coefficient of 9 ppm/°C for the B grade and 25 ppm/°C for the A grade. This device is designed to provide a stable output voltage with a minimum supply voltage headroom of 300 mV above the output voltage, making it ideal for battery-operated applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Output Voltage | VO | A grade | 2.494 | 2.5 | 2.506 | V |
| B grade | 2.496 | 2.5 | 2.504 | V | ||
| Initial Accuracy | VOERR | A grade | 6 mV | mV | ||
| A grade | 0.24 % | % | ||||
| B grade | 4 mV | mV | ||||
| B grade | 0.16 % | % | ||||
| Temperature Coefficient | TCVO | A grade, −40°C < TA < +125°C | 25 ppm/°C | ppm/°C | ||
| B grade, −40°C < TA < +125°C | 9 ppm/°C | ppm/°C | ||||
| Supply Voltage Headroom | VIN − VO | 300 mV | mV | |||
| Line Regulation | ΔVO/ΔVIN | VIN = 2.8 V to 15 V, −40°C < TA < +125°C | 10 - 25 ppm/V | ppm/V | ||
| Load Regulation | ΔVO/ΔILOAD | ILOAD = 0 mA to 5 mA, −40°C < TA < +85°C, VIN = 3 V | 60 ppm/mA | ppm/mA | ||
| Operating Temperature Range | −40°C | +125°C | °C | |||
| Storage Temperature Range | −65°C | +125°C | °C | |||
| Package Type | 5-Lead TSOT |
Key Features
- High Precision: The ADR391 offers high precision with initial accuracy of ±4 mV (B grade) and ±6 mV (A grade).
- Low Temperature Coefficient: Achieves a low temperature coefficient of 9 ppm/°C for the B grade and 25 ppm/°C for the A grade.
- Low Power Operation: Micropower consumption, making it suitable for battery-operated applications.
- Compact Package: Available in a 5-lead TSOT package, which is small and space-efficient.
- No External Capacitors Required: The advanced design eliminates the need for external capacitors, reducing board space and system cost.
- Stable Output Voltage: Provides a stable output voltage from a minimum supply of 300 mV above the output voltage.
Applications
- Battery-Operated Devices: Ideal for battery-operated applications due to its low power consumption and high precision.
- Portable Electronics: Suitable for use in portable electronics where space and power efficiency are critical.
- Industrial Automation: Can be used in industrial automation systems where stable and precise voltage references are required.
- Medical Devices: Applicable in medical devices that require high precision and reliability.
Q & A
- What is the output voltage of the ADR391?
The output voltage of the ADR391 is 2.5V.
- What is the temperature coefficient of the ADR391?
The temperature coefficient of the ADR391 is 9 ppm/°C for the B grade and 25 ppm/°C for the A grade.
- What is the minimum supply voltage headroom required for the ADR391?
The minimum supply voltage headroom required is 300 mV above the output voltage.
- Does the ADR391 require external capacitors?
No, the ADR391 does not require external capacitors due to its advanced design.
- What is the operating temperature range of the ADR391?
The operating temperature range is −40°C to +125°C.
- What package type is the ADR391 available in?
The ADR391 is available in a 5-lead TSOT package.
- Is the ADR391 suitable for battery-operated applications?
Yes, the ADR391 is highly suitable for battery-operated applications due to its low power consumption and high precision.
- What is the initial accuracy of the ADR391?
The initial accuracy is ±4 mV for the B grade and ±6 mV for the A grade.
- How does the ADR391 manage temperature drift?
The ADR391 uses patented temperature drift curvature correction techniques to manage temperature drift.
- What are some common applications of the ADR391?
Common applications include battery-operated devices, portable electronics, industrial automation, and medical devices.
