Overview
The AD8221BR-REEL7 from Analog Devices Inc. is a high-performance, gain-programmable instrumentation amplifier. It is renowned for its exceptional common-mode rejection ratio (CMRR) over a wide frequency range, making it ideal for applications requiring precise amplification of small differential signals. The AD8221BR-REEL7 is part of the AD8221 family, which offers high accuracy and stability, making it suitable for various precision instrumentation applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Range | ±2.3 | ±18 | V | |
| Quiescent Current | 0.9 | 1 | 1.2 | mA |
| Temperature Range for Specified Performance | -40 | 85 | °C | |
| CMRR (G = 1, 10 kHz) | 80 | dB | ||
| -3 dB Bandwidth (G = 1) | 825 | kHz | ||
| Slew Rate | 2 | V/µs | ||
| Input Voltage Noise | 8 | nV/√Hz @ 1 kHz | ||
| Input Offset Voltage | 25 | 25 | µV | |
| Input Offset Drift | 0.3 | 0.3 | µV/°C | |
| Input Bias Current | 0.5 | 2 | 3 | nA |
Key Features
- Gain programmable with a single external resistor (gain range 1 to 1000)
- High CMRR of 80 dB to 10 kHz, ensuring excellent rejection of wideband interference and line harmonics
- Low noise: 8 nV/√Hz at 1 kHz and 0.25 µV p-p input noise (0.1 Hz to 10 Hz)
- High accuracy DC performance with a maximum input offset voltage of 25 µV and a maximum input offset drift of 0.3 µV/°C
- Wide power supply range: ±2.3 V to ±18 V
- Operating 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
- Biomedical analysis
- Aerospace instrumentation
Q & A
- What is the AD8221BR-REEL7 used for? The AD8221BR-REEL7 is used for precise amplification of small differential signals in various instrumentation applications.
- What is the gain range of the AD8221BR-REEL7? The gain range is 1 to 1000, set by a single external resistor.
- What is the CMRR of the AD8221BR-REEL7 at 10 kHz? The CMRR is a minimum of 80 dB at 10 kHz.
- What is the operating supply range of the AD8221BR-REEL7? The operating supply range is ±2.3 V to ±18 V.
- What is the temperature range for specified performance? The temperature range for specified performance is -40°C to +85°C.
- What is the input voltage noise of the AD8221BR-REEL7? The input voltage noise is 8 nV/√Hz at 1 kHz.
- What is the maximum input offset voltage of the AD8221BR-REEL7? The maximum input offset voltage is 25 µV.
- What is the slew rate of the AD8221BR-REEL7? The slew rate is 2 V/µs.
- What are some common applications of the AD8221BR-REEL7? Common applications include weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, and medical instrumentation.
- How is the gain of the AD8221BR-REEL7 set? The gain is set with a single external resistor across the RG pins using the formula G = 1 + (49.4 kΩ/RG).
