Overview
The ADR421AR-REEL7 is a precision voltage reference from Analog Devices Inc., part of the ADR42x series. This component is designed with ultraprecision, low noise, and high accuracy, making it ideal for various precision conversion applications. The ADR421AR-REEL7 features Analog Devices' patented XFET (eXtra implanted junction FET) technology, which minimizes nonlinearity of the voltage change with temperature and offers superior accuracy and thermal hysteresis compared to other voltage reference technologies.
The device is available in an 8-lead SOIC package and is specified over an extended industrial temperature range of −40°C to +125°C. Its low power consumption and stable output voltage make it suitable for a wide range of applications, including optical networks, medical equipment, and battery-powered devices.
Key Specifications
| Parameter | Symbol | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|---|
| Output Voltage (A Grade) | VOUT | VIN = 5.0 V to 15.0 V, TA = 25°C | 2.497 | 2.500 | 2.503 | V |
| Output Voltage (B Grade) | VOUT | VIN = 5.0 V to 15.0 V, TA = 25°C | 2.499 | 2.500 | 2.501 | V |
| Initial Accuracy (A Grade) | VOUTERR | VIN = 5.0 V to 15.0 V, TA = 25°C | −3 | +3 | mV | |
| Initial Accuracy (B Grade) | VOUTERR | VIN = 5.0 V to 15.0 V, TA = 25°C | −1 | +1 | mV | |
| Temperature Coefficient (A Grade) | TCVOUT | −40°C < TA < +125°C | 2 | 10 | ppm/°C | |
| Temperature Coefficient (B Grade) | TCVOUT | −40°C < TA < +125°C | 1 | 3 | ppm/°C | |
| Supply Voltage Headroom | VIN - VOUT | VIN = 5 V to 18 V | 2 | V | ||
| Line Regulation | ΔVOUT/ΔVIN | VIN = 5 V to 18 V, −40°C < TA < +125°C | 10 | 35 | ppm/V | |
| Output Voltage Hysteresis | VO_HYS | 40 | ppm | |||
| Ripple Rejection Ratio | RRR | fIN = 1 kHz | −75 | dB | ||
| Short Circuit to GND | ISC | 27 | mA | |||
| Turn-On Settling Time | tR | 10 | μs | |||
| Long-Term Stability | ΔVO | 1000 Hours | 50 | ppm | ||
| Quiescent Current | IIN | No load, −40°C < TA < +125°C | 390 | 600 | μA | |
| Voltage Noise (0.1 Hz to 10 Hz) | eN p-p | 1.75 | μV p-p |
Key Features
- Ultraprecision and Low Noise: The ADR421AR-REEL7 features low noise characteristics, with a voltage noise of 1.75 μV p-p in the 0.1 Hz to 10 Hz band, making it suitable for high-precision applications.
- High Accuracy and Stability: The device offers high initial accuracy and long-term stability, with a temperature coefficient as low as 1 ppm/°C to 10 ppm/°C, depending on the grade.
- XFET Technology: Utilizes Analog Devices' patented XFET technology, which minimizes nonlinearity of the voltage change with temperature and provides superior accuracy and thermal hysteresis.
- Adjustable Output Voltage: The trim terminal allows for adjusting the output voltage over a ±0.5% range without affecting the temperature coefficient, enabling fine-tuning of system errors.
- Low Power Consumption: Operates with low quiescent current, making it ideal for battery-powered applications.
- Wide Operating Temperature Range: Specified over an extended industrial temperature range of −40°C to +125°C, ensuring reliable performance in various environmental conditions).
Applications
- Precision Conversion Applications: Ideal for applications such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and other precision conversion systems).
- Optical Networks: Suitable for use in optical network equipment due to its high accuracy and stability).
- Medical Equipment: Used in medical devices where precise voltage references are critical for accurate measurements and operations).
- Battery-Powered Devices: The low power consumption makes it suitable for battery-powered applications, ensuring long battery life and reliable performance).
Q & A
- What is the output voltage of the ADR421AR-REEL7?
The output voltage of the ADR421AR-REEL7 is 2.500 V, with a tolerance of ±0.003 V for the A grade and ±0.001 V for the B grade).
- What is the temperature coefficient of the ADR421AR-REEL7?
The temperature coefficient is 2 ppm/°C to 10 ppm/°C for the A grade and 1 ppm/°C to 3 ppm/°C for the B grade over the temperature range of −40°C to +125°C).
- What is the noise performance of the ADR421AR-REEL7?
The voltage noise is 1.75 μV p-p in the 0.1 Hz to 10 Hz band).
- Can the output voltage of the ADR421AR-REEL7 be adjusted?
Yes, the output voltage can be adjusted over a ±0.5% range using the trim terminal without affecting the temperature coefficient).
- What is the operating temperature range of the ADR421AR-REEL7?
The device is specified over an extended industrial temperature range of −40°C to +125°C).
- What is the quiescent current of the ADR421AR-REEL7?
The quiescent current is between 390 μA and 600 μA, depending on the temperature and load conditions).
- What are the typical applications of the ADR421AR-REEL7?
Typical applications include precision conversion systems, optical networks, medical equipment, and battery-powered devices).
- What is the ripple rejection ratio of the ADR421AR-REEL7?
The ripple rejection ratio is −75 dB at 1 kHz).
- What is the turn-on settling time of the ADR421AR-REEL7?
The turn-on settling time is 10 μs).
- What is the long-term stability of the ADR421AR-REEL7?
The long-term stability is 50 ppm over 1000 hours).
