AD621BRZ
Precision instrumentation amplifiers in 8-pin SOIC for low-drift applications
Manufacturer： analog-devices
series introduction
# AD621BRZ: A High - Performance Instrumentation Amplifier Product Series
## 1. Overview
The AD621BRZ belongs to a remarkable series of instrumentation amplifiers designed and manufactured by Analog Devices. Instrumentation amplifiers are crucial components in various electronic systems, especially those requiring accurate amplification of small differential signals in the presence of large common - mode voltages. The AD621BRZ series stands out for its high precision, low noise, and excellent common - mode rejection ratio (CMRR), making it an ideal choice for a wide range of applications.
## 2. Key Features
### 2.1 High Precision
- **Gain Accuracy**: The AD621BRZ offers a high level of gain accuracy. It can be configured to have a fixed gain or a user - adjustable gain. The gain is set by a single external resistor, which simplifies the design process. With a well - defined gain formula, the amplifier can achieve very precise amplification, ensuring that the output signal accurately represents the input differential signal.
- **Low Offset Voltage**: Offset voltage is an important parameter in instrumentation amplifiers as it can introduce errors in the output signal. The AD621BRZ has a very low offset voltage, typically in the microvolt range. This low offset voltage helps in maintaining the accuracy of the amplified signal, especially when dealing with small input signals.
### 2.2 Low Noise
- **Low Input Noise**: In many applications, such as sensor signal conditioning, the input signals are often very small and can be easily corrupted by noise. The AD621BRZ has a low input noise density, which means it adds minimal noise to the input signal during the amplification process. This is crucial for applications where the signal - to - noise ratio (SNR) needs to be maximized, such as in medical instrumentation and audio processing.
### 2.3 Excellent Common - Mode Rejection Ratio (CMRR)
- **Rejection of Common - Mode Signals**: The AD621BRZ has a high CMRR, typically in the range of 100 dB or more. This means that it can effectively reject common - mode signals, which are signals that appear equally on both input terminals. In real - world applications, common - mode signals can be caused by electromagnetic interference (EMI), power supply noise, or ground loops. The high CMRR of the AD621BRZ ensures that only the differential signal is amplified, while the common - mode signals are suppressed.
### 2.4 Wide Power Supply Range
- **Flexible Power Options**: The AD621BRZ can operate over a wide power supply range, typically from ±2.3 V to ±18 V. This wide power supply range allows it to be used in a variety of applications, including battery - powered devices and systems with different power requirements. It also provides flexibility in system design, as the amplifier can be easily integrated into existing power supply architectures.
### 2.5 Small Package Size
- **Space - Saving Design**: The AD621BRZ is available in a small surface - mount package, such as the 8 - lead SOIC (Small Outline Integrated Circuit) package. This small package size makes it suitable for applications where board space is limited, such as in portable devices and miniaturized electronic systems.
## 3. Applications
### 3.1 Medical Instrumentation
- **ECG and EEG Monitoring**: In electrocardiogram (ECG) and electroencephalogram (EEG) monitoring systems, the AD621BRZ can be used to amplify the small electrical signals generated by the heart and brain, respectively. Its high precision, low noise, and excellent CMRR are essential for accurately capturing and amplifying these weak signals in the presence of common - mode interference from
Images for reference
8-SOIC
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