Overview
The AD8221BRZ-R7, 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 reject wideband interference and line harmonics, significantly simplifying filter requirements. It is particularly suited for applications that demand high dc performance, such as precision data acquisition, biomedical analysis, and aerospace instrumentation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Power Supply Range | ±2.3 V | ±18 V | V | |
| CMRR (G = 1, DC to 10 kHz) | 80 dB | dB | ||
| -3 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 Offset Drift | 0.3 μV/°C | μV/°C | ||
| Input Bias Current | 0.4 nA | nA | ||
| Temperature Range for Specified Performance | -40°C | +85°C | °C | |
| Operating Temperature Range | -40°C | +125°C | °C |
Key Features
- Gain Programmability: 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 to 10 kHz, rejecting wideband interference and line harmonics.
- Low Noise: Features an input voltage noise of 8 nV/√Hz at 1 kHz and 0.25 μV p-p input noise (0.1 Hz to 10 Hz).
- High Accuracy DC Performance: Includes low input offset voltage (25 μV max), low input offset drift (0.3 μV/°C max), and low input bias current (0.4 nA max).
- Wide Power Supply Range: Operates with power supply voltages from ±2.3 V to ±18 V.
- High Dynamic Response: Offers a -3 dB bandwidth of 825 kHz at G = 1 and a slew rate of 2 V/μs.
- Temperature Stability: Specified performance over -40°C to +85°C and operating range up to +125°C.
Applications
- Precision Data Acquisition Systems: Ideal for high-resolution data acquisition due to its high CMRR and low noise characteristics.
- Medical Instrumentation: Used in medical devices requiring high accuracy and low noise, such as ECG and EEG systems.
- Industrial Process Controls: Suitable for industrial applications like weigh scales and bridge amplifiers.
- Aerospace Instrumentation: Supports defense and aerospace applications with its enhanced product features and military temperature range.
- Strain Gages and Transducer Interfaces: High accuracy and stability make it suitable for strain gauge and transducer interface applications.
Q & A
- What is the gain range of the AD8221BRZ-R7?
The gain range of the AD8221BRZ-R7 is from 1 to 1000, set by a single external resistor.
- What is the CMRR of the AD8221BRZ-R7 at 10 kHz?
The CMRR of the AD8221BRZ-R7 is a minimum of 80 dB at 10 kHz for G = 1.
- What is the input voltage noise of the AD8221BRZ-R7 at 1 kHz?
The input voltage noise of the AD8221BRZ-R7 is 8 nV/√Hz at 1 kHz.
- What is the operating power supply range of the AD8221BRZ-R7?
The operating power supply range is from ±2.3 V to ±18 V.
- What is the temperature range for specified performance of the AD8221BRZ-R7?
The temperature range for specified performance is from -40°C to +85°C, with an operating range up to +125°C.
- What are some typical applications of the AD8221BRZ-R7?
Typical applications include precision data acquisition systems, medical instrumentation, industrial process controls, aerospace instrumentation, and strain gage and transducer interfaces.
- What is the slew rate of the AD8221BRZ-R7?
The slew rate of the AD8221BRZ-R7 is 2 V/μs.
- What is the input offset voltage of the AD8221BRZ-R7?
The input offset voltage of the AD8221BRZ-R7 is a maximum of 25 μV.
- What is the input bias current of the AD8221BRZ-R7?
The input bias current of the AD8221BRZ-R7 is a maximum of 0.4 nA.
- Does the AD8221BRZ-R7 support military temperature ranges?
Yes, the AD8221BRZ-R7 supports a military temperature range from -55°C to +125°C for the AD8221-EP version.
