Overview
The AD8221BRZ, manufactured 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 high CMRR 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 |
|---|---|---|---|---|---|
| Power Supply Operating Range | ±2.3 | ±18 | V | ||
| Temperature Range for Specified Performance | −40 | +85 | °C | ||
| Operational Temperature Range | −40 | +125 | °C | ||
| CMRR (G = 1) | 80 | dB (to 10 kHz) | |||
| Bandwidth (G = 1) | 825 | kHz | |||
| Slew Rate | 2 | V/µs | |||
| Input Voltage Noise | @ 1 kHz | 8 | nV/√Hz | ||
| Input Offset Voltage | 25 | µV | |||
| Input Offset Drift | 0.3 | µV/°C | |||
| Input Bias Current | 0.5 | 2 | 3 | nA |
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 from ±2.3 V to ±18 V.
- High Accuracy DC Performance: Features low voltage offset, low offset drift, and high gain accuracy, making it suitable for applications requiring precise DC performance.
- Low Noise: Exhibits low input voltage noise of 8 nV/√Hz at 1 kHz and low input bias current.
- Compact Packaging: Available in space-saving 8-lead SOIC and MSOP packages, ideal for multichannel or space-constrained applications.
Applications
- Weigh Scales: Used in precision weight measurement systems.
- Industrial Process Controls: Employed in monitoring and controlling industrial processes.
- Bridge Amplifiers: Suitable for bridge signal conditioning in various applications.
- Precision Data Acquisition Systems: Ideal for high-precision data acquisition and measurement systems.
- Medical Instrumentation: Used in medical devices requiring high accuracy and low noise.
- Strain Gages and Transducer Interfaces: Applied in strain gauge and transducer interface applications.
- Aerospace Instrumentation: Supports defense and aerospace applications, including those requiring AQEC standards.
Q & A
- What is the gain range of the AD8221BRZ?
The gain of the AD8221BRZ can be set from 1 to 1000 using a single external resistor.
- What is the CMRR of the AD8221BRZ?
The AD8221BRZ maintains a minimum CMRR of 80 dB up to 10 kHz.
- What is the operational temperature range of the AD8221BRZ?
The AD8221BRZ operates from −40°C to +125°C.
- What are the available package options for the AD8221BRZ?
The AD8221BRZ is available in 8-lead SOIC and MSOP packages.
- What are some typical applications of the AD8221BRZ?
Typical applications include weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, medical instrumentation, and aerospace instrumentation.
- What is the input voltage noise of the AD8221BRZ?
The input voltage noise of the AD8221BRZ is 8 nV/√Hz at 1 kHz.
- How does the AD8221BRZ handle power supply variations?
The AD8221BRZ operates with a wide power supply range from ±2.3 V to ±18 V and has high power supply rejection ratio (PSRR).
- What is the slew rate of the AD8221BRZ?
The slew rate of the AD8221BRZ is 2 V/µs.
- Is the AD8221BRZ suitable for aerospace applications?
- How does the AD8221BRZ perform in terms of input offset voltage and drift?
The AD8221BRZ has a maximum input offset voltage of 25 µV and a maximum input offset drift of 0.3 µV/°C.
