Overview
The AD8221ARZ, 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 is designed to provide excellent AC and DC specifications, making it an ideal choice for applications requiring high accuracy and precision.
The AD8221ARZ 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. Its programmable gain, set by a single external resistor, ranges from 1 to 1000, offering significant design flexibility.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Operating Range | ±2.3 | ±18 | V | ||
| Quiescent Current | T = −40°C to +85°C | 0.9 | 1 | 1.2 | mA |
| CMRR (G = 1) | f = 10 kHz | 80 | dB | ||
| Bandwidth (G = 1) | 825 | kHz | |||
| Slew Rate | 2 | V/µs | |||
| Input Voltage Noise | f = 1 kHz | 8 | nV/√Hz | ||
| Input Offset Voltage | 25 | µV | |||
| Input Offset Drift | 0.3 | µV/°C | |||
| Input Bias Current | T = −40°C to +85°C | 0.5 | 2 | 3 | nA |
Key Features
- Gain programmable with a single external resistor (gain range 1 to 1000)
- Wide power supply range: ±2.3 V to ±18 V
- Temperature range for specified performance: −40°C to +85°C, operational up to 125°C
- Excellent AC specifications: 80 dB minimum CMRR to 10 kHz (G = 1), 825 kHz, –3 dB bandwidth (G = 1), and 2 V/µs slew rate
- Low noise: 8 nV/√Hz input voltage noise at 1 kHz, and 0.25 µV p-p input noise (0.1 Hz to 10 Hz)
- High accuracy DC performance: low voltage offset, low offset drift, and high gain accuracy
- Available in space-saving MSOP and SOIC packages
Applications
- Weigh scales
- Industrial process controls
- Bridge amplifiers
- Precision data acquisition systems
- Medical instrumentation
- Strain gages and transducer interfaces
- Biomedical analysis and aerospace instrumentation
Q & A
- What is the gain range of the AD8221ARZ?
The gain range of the AD8221ARZ is from 1 to 1000, set by a single external resistor.
- What is the power supply range for the AD8221ARZ?
The power supply range for the AD8221ARZ is ±2.3 V to ±18 V.
- What is the temperature range for specified performance of the AD8221ARZ?
The temperature range for specified performance is −40°C to +85°C, with operational capabilities up to 125°C.
- What is the CMRR of the AD8221ARZ at 10 kHz?
The CMRR of the AD8221ARZ is a minimum of 80 dB at 10 kHz for G = 1.
- What is the bandwidth of the AD8221ARZ at a gain of 1?
The bandwidth of the AD8221ARZ at a gain of 1 is 825 kHz.
- What is the slew rate of the AD8221ARZ?
The slew rate of the AD8221ARZ is 2 V/µs.
- What are the typical noise specifications of the AD8221ARZ?
The AD8221ARZ has an input voltage noise of 8 nV/√Hz at 1 kHz and 0.25 µV p-p input noise from 0.1 Hz to 10 Hz.
- What are the available packages for the AD8221ARZ?
The AD8221ARZ is available in 8-lead SOIC and 8-lead MSOP packages.
- What are some common applications of the AD8221ARZ?
Common applications include weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, medical instrumentation, and strain gages/transducer interfaces.
- Is the AD8221ARZ suitable for aerospace and defense applications?
Yes, the AD8221-EP version supports defense and aerospace applications with a military temperature range and controlled manufacturing baseline.
