Overview
The AD8221BRZ-RL, produced by Analog Devices Inc., is a high-performance, gain-programmable instrumentation amplifier. It is renowned for delivering the industry’s highest Common Mode Rejection Ratio (CMRR) over frequency in its class. The AD8221 maintains a minimum CMRR of 80 dB up to 10 kHz, significantly reducing the need for additional filtering and making it ideal for applications requiring high precision and noise rejection.
This amplifier is available in an 8-lead SOIC package and operates over a wide power supply range of ±2.3 V to ±18 V. It is specified for performance over the industrial temperature range of −40°C to +85°C and can operate up to 125°C. The AD8221 is highly versatile, with a gain range of 1 to 1000 set by a single external resistor, making it suitable for various precision measurement and signal conditioning tasks.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Operating Range | ±2.3 V | ±18 V | V | ||
| Quiescent Current | T = −40°C to +85°C | 0.9 mA | 1 mA | 1.2 mA | mA |
| CMRR (G = 1) | DC to 10 kHz | 80 dB | dB | ||
| Bandwidth (G = 1) | 825 kHz | kHz | |||
| Slew Rate | 2 V/μs | V/μs | |||
| Input Voltage Noise | @ 1 kHz | 8 nV/√Hz | nV/√Hz | ||
| Input Offset Voltage | 25 μV | μV | |||
| Input Bias Current | 0.4 nA | nA | |||
| Temperature Range for Specified Performance | −40°C | +85°C | °C |
Key Features
- High CMRR: Maintains a minimum CMRR of 80 dB up to 10 kHz, reducing the need for additional filtering and enhancing noise rejection.
- Programmable Gain: Gain can be set from 1 to 1000 using a single external resistor, offering design flexibility.
- Wide Power Supply Range: Operates with power supplies ranging from ±2.3 V to ±18 V, making it suitable for various applications.
- Low Noise and Offset: Features low input voltage noise (8 nV/√Hz at 1 kHz) and low input offset voltage (25 μV), ensuring high accuracy in signal conditioning.
- High Bandwidth and Slew Rate: Offers a bandwidth of 825 kHz and a slew rate of 2 V/μs at a gain of 1.
- Compact Packaging: Available in space-saving 8-lead SOIC and MSOP packages, ideal for multichannel or space-constrained applications.
Applications
- Precision Data Acquisition Systems: Ideal for applications requiring high precision and low noise.
- Bridge Amplifiers and Strain Gages: Suitable for bridge signal conditioning due to its high CMRR and low offset drift.
- Medical Instrumentation: Used in biomedical analysis and medical devices where high accuracy and low noise are critical.
- Aerospace Instrumentation: The AD8221-EP version supports defense and aerospace applications with a military temperature range (−55°C to +125°C).
- Industrial Process Controls: Applicable in industrial settings for precise signal conditioning and measurement.
- Transducer Interfaces: Used in various transducer interfaces where high CMRR and low noise are essential.
Q & A
- What is the CMRR of the AD8221 at 10 kHz?
The AD8221 maintains a minimum CMRR of 80 dB up to 10 kHz at a gain of 1.
- How is the gain of the AD8221 set?
The gain of the AD8221 can be set from 1 to 1000 using a single external resistor across the RG pins.
- What is the bandwidth of the AD8221 at a gain of 1?
The bandwidth of the AD8221 at a gain of 1 is 825 kHz.
- What is the input voltage noise of the AD8221 at 1 kHz?
The input voltage noise of the AD8221 at 1 kHz is 8 nV/√Hz.
- What is the temperature range for specified performance of the AD8221?
The temperature range for specified performance of the AD8221 is −40°C to +85°C.
- Is the AD8221 suitable for aerospace applications?
Yes, the AD8221-EP version is specifically designed to support defense and aerospace applications with a military temperature range (−55°C to +125°C).
- What are the common applications of the AD8221?
The AD8221 is commonly used in precision data acquisition systems, bridge amplifiers, medical instrumentation, aerospace instrumentation, industrial process controls, and transducer interfaces.
- What is the slew rate of the AD8221?
The slew rate of the AD8221 is 2 V/μs.
- What are the packaging options for the AD8221?
The AD8221 is available in 8-lead SOIC and 8-lead MSOP packages.
- What is the input offset voltage of the AD8221?
The input offset voltage of the AD8221 is 25 μV.
