AD621AN
Single-channel instrumentation amplifiers in 8-pin DIP format
Manufacturer： ['rochester', 'analog-devices']
series introduction
# AD621AN: A High - Performance Instrumentation Amplifier Product Series
## 1. Overview
The AD621AN belongs to a remarkable series of instrumentation amplifiers developed by Analog Devices. Instrumentation amplifiers are crucial components in various electronic systems, especially those that require precise amplification of small differential signals in the presence of large common - mode voltages. The AD621AN series is designed to meet the demanding requirements of applications such as data acquisition, industrial process control, medical instrumentation, and sensor signal conditioning.
## 2. Key Features
### 2.1 High Precision
- **Low Offset Voltage**: The AD621AN offers extremely low input offset voltage. This characteristic is essential when dealing with small - amplitude signals, as it ensures that the output accurately represents the input signal without significant DC errors. For example, in a sensor application where the signal of interest might be in the millivolt or even microvolt range, a low offset voltage helps in maintaining the integrity of the measurement.
- **Low Drift**: It has a low temperature drift of the offset voltage. As the operating temperature of the amplifier changes, the offset voltage remains relatively stable. This is vital in applications where the environment temperature can vary, such as in industrial settings or outdoor monitoring systems.
### 2.2 High Common - Mode Rejection Ratio (CMRR)
- The AD621AN series boasts a high CMRR, typically on the order 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 scenarios, common - mode signals can be caused by electromagnetic interference (EMI), power supply noise, or ground loops. A high CMRR ensures that only the differential signal (the signal of interest) is amplified, while the common - mode noise is suppressed.
### 2.3 Wide Gain Range
- The gain of the AD621AN can be easily adjusted using a single external resistor. The gain range is quite wide, typically from 1 to 10,000. This flexibility allows the amplifier to be used in a variety of applications with different signal levels. For instance, in a low - level sensor signal conditioning application, a high gain can be set to amplify the weak sensor output to a level suitable for further processing.
### 2.4 Low Power Consumption
- It is designed to operate with relatively low power consumption. This makes it suitable for battery - powered applications or systems where power efficiency is a concern. The low power requirement also helps in reducing heat dissipation, which can improve the reliability and longevity of the amplifier.
## 3. Electrical Specifications
### 3.1 Supply Voltage
- The AD621AN can operate over a wide range of supply voltages, typically from ±2.3 V to ±18 V. This wide supply voltage range provides flexibility in different power supply configurations, allowing it to be integrated into various electronic systems.
### 3.2 Input Impedance
- It has a very high input impedance, typically in the order of giga - ohms. A high input impedance ensures that the amplifier does not load the source circuit significantly. This is important when amplifying signals from high - impedance sources such as sensors, as it prevents signal attenuation and distortion.
### 3.3 Bandwidth
- The bandwidth of the AD621AN is sufficient for many applications. It can handle signals with frequencies up to several hundred kilohertz, depending on the gain setting. This allows it to be used in applications where the input signals have a certain frequency content, such as in audio or some high - speed sensor applications.
## 4. Package and Pinout
- The AD621AN is available in a standard 8 - pin dual - in -
Images for reference
8-DIP
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