Overview
The AD8421ARZ-R7, produced by Analog Devices Inc., is a high-performance, low-power instrumentation amplifier designed for precision applications. This amplifier is known for its excellent dc performance, high common-mode rejection ratio (CMRR), and low noise characteristics. It is available in an 8-lead SOIC package and is suitable for a wide range of temperatures from −40°C to +85°C. The AD8421ARZ-R7 is ideal for applications requiring high accuracy and reliability, such as medical instrumentation, precision data acquisition, and vibration analysis.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | −40°C to +85°C | °C |
| Supply Voltage Range | ±2.5 V to ±18 V (5 V to 36 V single supply) | V |
| Gain Range | 1 to 10,000 | |
| Settling Time (G = 10) | 0.6 µs to 0.001% | µs |
| CMRR at 20 kHz (G = 1) | 80 dB | dB |
| Slew Rate | 35 V/µs | V/µs |
| Input Offset Voltage Drift | 0.2 µV/°C | µV/°C |
| Gain Drift (G = 1) | 1 ppm/°C | ppm/°C |
| Input Bias Current | 500 pA | pA |
| Input Voltage Noise | 3 nV/√Hz | nV/√Hz |
| Current Noise | 200 fA/√Hz | fA/√Hz |
| Quiescent Current | 2 mA | mA |
| Package Type | 8-lead SOIC |
Key Features
- High precision dc performance with low input offset voltage drift (0.2 µV/°C) and low gain drift (1 ppm/°C).
- High common-mode rejection ratio (CMRR) of 80 dB at 20 kHz (G = 1).
- Fast settling time of 0.6 µs to 0.001% (G = 10) and a slew rate of 35 V/µs.
- Low noise characteristics with 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise.
- Input protection up to 40 V from the opposite supply rail without damage.
- Gain settable with a single resistor from 1 to 10,000.
- Low quiescent current of 2 mA.
Applications
- Medical instrumentation: Suitable for precise measurements in medical devices.
- Precision data acquisition: Ideal for high-accuracy data acquisition systems.
- Microphone preamplification: Used in audio applications requiring low noise and high gain.
- Vibration analysis: Excellent for measuring low-level signals in vibration analysis.
- Multiplexed input applications: Suitable for systems with multiple input channels.
- ADC driver: Can be used as a driver for analog-to-digital converters (ADCs).
Q & A
- What is the operating temperature range of the AD8421ARZ-R7?
The operating temperature range is from −40°C to +85°C. - What is the supply voltage range for the AD8421ARZ-R7?
The supply voltage range is ±2.5 V to ±18 V (or 5 V to 36 V single supply). - How is the gain of the AD8421ARZ-R7 set?
The gain is settable with a single resistor from 1 to 10,000. - What is the settling time of the AD8421ARZ-R7 at a gain of 10?
The settling time is 0.6 µs to 0.001% at a gain of 10. - What is the CMRR of the AD8421ARZ-R7 at 20 kHz and a gain of 1?
The CMRR is 80 dB at 20 kHz and a gain of 1. - What are the noise characteristics of the AD8421ARZ-R7?
The AD8421ARZ-R7 has an input voltage noise of 3 nV/√Hz and a current noise of 200 fA/√Hz. - What is the quiescent current of the AD8421ARZ-R7?
The quiescent current is 2 mA. - What types of applications is the AD8421ARZ-R7 suitable for?
The AD8421ARZ-R7 is suitable for medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, multiplexed input applications, and as an ADC driver. - What is the package type of the AD8421ARZ-R7?
The package type is an 8-lead SOIC. - Is the AD8421ARZ-R7 protected against high input voltages?
Yes, the AD8421ARZ-R7 has input protection up to 40 V from the opposite supply rail without damage.
