Overview
The AD8221AR-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 reducing the need for additional filtering and making it ideal for applications requiring high precision and noise rejection.
The AD8221 is available in compact packages such as the 8-lead SOIC and 8-lead MSOP, making it suitable for space-constrained and multichannel applications. It operates over a wide power supply range of ±2.3 V to ±18 V and is specified for performance over the industrial temperature range of −40°C to +85°C, with operational capabilities up to 125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Range | ±2.3 | - | ±18 | V |
| Temperature Range for Specified Performance | -40 | - | 85 | °C |
| Operational Temperature Range | -40 | - | 125 | °C |
| CMRR (G = 1, up to 10 kHz) | 80 | - | - | dB |
| -3 dB Bandwidth (G = 1) | 825 | - | - | kHz |
| Slew Rate | 2 | - | - | V/µs |
| Input Voltage Noise (at 1 kHz) | 8 | - | - | nV/√Hz |
| Input Offset Voltage | - | - | 25 | µV |
| Input Bias Current | 0.5 | 2 | 3 | nA |
| Output Swing (VS = ±2.3 V to ±5 V) | -VS + 1.1 | - | +VS - 1.2 | V |
| Short-Circuit Current | 18 | - | - | mA |
Key Features
- Gain programmable with a single external resistor (gain range 1 to 1000)
- High CMRR of 80 dB up to 10 kHz, reducing the need for additional filtering
- Wide power supply range: ±2.3 V to ±18 V
- Excellent AC specifications: 825 kHz -3 dB bandwidth and 2 V/µs slew rate
- Low noise: 8 nV/√Hz input voltage noise at 1 kHz
- High accuracy DC performance: low input offset voltage and drift
- Available in space-saving 8-lead SOIC and 8-lead MSOP packages
- Operational temperature range: -40°C to 125°C
Applications
- Weigh scales
- Industrial process controls
- Bridge amplifiers
- Precision data acquisition systems
- Medical instrumentation
- Strain gages and transducer interfaces
- Aerospace instrumentation
- Biomedical analysis
Q & A
- What is the gain range of the AD8221? The gain range of the AD8221 is 1 to 1000, set by a single external resistor.
- What is the CMRR of the AD8221 up to 10 kHz? The CMRR of the AD8221 is a minimum of 80 dB up to 10 kHz.
- What is the -3 dB bandwidth of the AD8221 at a gain of 1? The -3 dB bandwidth at a gain of 1 is 825 kHz.
- What is the slew rate of the AD8221? The slew rate of the AD8221 is 2 V/µs.
- What is the input voltage noise of the AD8221 at 1 kHz? The input voltage noise at 1 kHz is 8 nV/√Hz.
- What are the typical input offset voltage and drift of the AD8221? The typical input offset voltage is 25 µV, and the drift is 0.3 µV/°C.
- What is the input bias current of the AD8221? The input bias current is typically 2 nA, with a maximum of 3 nA over the specified temperature range.
- In what temperature range is the AD8221 specified for performance? The AD8221 is specified for performance over the temperature range of -40°C to +85°C.
- What are the available package types for the AD8221? The AD8221 is available in 8-lead SOIC and 8-lead MSOP packages.
- What are some common applications of the AD8221? Common applications include weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, and medical instrumentation.
