Overview
The AD8221ARM-REEL, 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. This amplifier maintains a minimum CMRR of 80 dB up to 10 kHz, significantly outperforming other instrumentation amplifiers which typically see CMRR degradation at 200 Hz. This feature allows the AD8221 to effectively reject wideband interference and line harmonics, simplifying filter requirements in various applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Common-Mode Rejection Ratio (CMRR) | DC to 60 Hz, G = 1 | 80 | 90 | - | dB |
| CMRR at 10 kHz | G = 1 | 80 | - | - | 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 (BR Grade) | - | µV |
| Input Offset Drift | - | - | 0.3 µV/°C (BR Grade) | - | µV/°C |
| Power Supply Range | - | ±2.3 V | - | ±18 V | V |
| Operating Temperature Range | - | −40°C | - | +85°C | °C |
Key Features
- Gain Programmability: The gain can be set with a single external resistor, offering a gain range from 1 to 1000.
- High CMRR: Maintains a minimum CMRR of 80 dB up to 10 kHz, ensuring excellent rejection of wideband interference and line harmonics.
- Wide Power Supply Range: Operates with power supply voltages ranging from ±2.3 V to ±18 V.
- Low Noise and Offset: Features low input voltage noise (8 nV/√Hz at 1 kHz) and low input offset voltage (25 µV for BR Grade).
- High Accuracy DC Performance: Offers low offset drift (0.3 µV/°C for BR Grade) and high gain accuracy.
- Compact Packaging: Available in space-saving 8-lead SOIC and MSOP packages, with the MSOP requiring half the board space of the SOIC.
Applications
- Weigh Scales: Ideal for precision weight measurement systems.
- Industrial Process Controls: Used in various industrial automation and control systems.
- Bridge Amplifiers: Suitable for bridge signal conditioning in strain gage and transducer applications.
- Precision Data Acquisition Systems: Enhances the accuracy of data acquisition in high-precision applications.
- Medical Instrumentation: Utilized in biomedical analysis and medical device instrumentation.
- Aerospace Instrumentation: Supports defense and aerospace applications, including the AD8221-EP model which meets AQEC standards.
Q & A
- What is the gain range of the AD8221?
The gain of the AD8221 can be set from 1 to 1000 using a single external resistor.
- What is the common-mode rejection ratio (CMRR) of the AD8221?
The AD8221 maintains a minimum CMRR of 80 dB up to 10 kHz for all grades at G = 1.
- What is the bandwidth of the AD8221?
The AD8221 has a bandwidth of 825 kHz at a gain of 1.
- What is the input voltage noise of the AD8221?
The input voltage noise is 8 nV/√Hz at 1 kHz.
- What are the operating temperature ranges for the AD8221?
The AD8221 operates from −40°C to +85°C for specified performance and up to 125°C for operational purposes.
- What are the typical applications of the AD8221?
Typical applications include weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, medical instrumentation, and aerospace instrumentation).
- What are the available package types for the AD8221?
The AD8221 is available in 8-lead SOIC and 8-lead MSOP packages).
- Does the AD8221 support single and dual power supplies?
Yes, the AD8221 operates on both single and dual power supplies).
- What is the slew rate of the AD8221?
The slew rate of the AD8221 is 2 V/µs).
- Is the AD8221 suitable for aerospace applications?
Yes, the AD8221-EP model is specifically designed to support defense and aerospace applications, meeting AQEC standards).
