Overview
The AD621AR, produced by Analog Devices Inc., is a high-accuracy, low-power instrumentation amplifier designed for a wide range of applications. It is known for its ease of use, low cost, and high performance, making it an ideal choice for precision signal conditioning and data acquisition systems. The AD621AR outperforms discrete in-amp implementations with its unique combination of high accuracy, small size, and low power consumption.
This amplifier is particularly suited for applications where power dissipation, size, and weight are critical, such as in portable or remote equipment. It features a very low supply current of 1.3 mA max and is available in compact 8-lead SOIC, 8-lead plastic DIP, or 8-lead cerdip packages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain | 10, 100 | V/V |
| Gain Error | 0.15% Max | % |
| Gain Drift | ±5 ppm/°C | ppm/°C |
| Total Offset Voltage | 75 µV Max | µV |
| Offset Voltage Drift | 1.0 µV/°C Max | µV/°C |
| Input Bias Current | 500 pA | pA |
| Input Voltage Noise | 9 nV/√Hz @ 1 kHz | nV/√Hz |
| Bandwidth | 800 kHz (G = 10), 200 kHz (G = 100) | kHz |
| Settling Time | 12 µs to 0.01% | µs |
| Supply Current | 1.3 mA Max | mA |
| Operating Temperature | -40°C to +85°C | °C |
| Package Type | 8-Lead SOIC, 8-Lead PDIP, 8-Lead CerDIP |
Key Features
- Easy to use with pin-strappable gains of 10 and 100.
- High accuracy and low gain errors due to internal gain setting resistors.
- Low power consumption with a maximum supply current of 1.3 mA.
- Compact packaging in 8-lead SOIC, 8-lead plastic DIP, or 8-lead cerdip.
- Excellent DC performance with low offset voltage and drift.
- Low noise characteristics, including 9 nV/√Hz input voltage noise at 1 kHz.
- High common-mode rejection ratio (CMRR) of 110 dB.
- Wide power supply range from ±2.3 V to ±18 V.
- Fast settling time of 12 µs to 0.01%.
Applications
- Signal conditioning for sensor interfaces and data acquisition systems.
- Measurement applications such as temperature, pressure, and noise monitoring.
- Instrumentation and monitoring systems, including control, test, and measurement.
- Weigh scales and transducer interface circuits requiring high total accuracy.
- Battery-powered and portable equipment where power dissipation, size, and weight are critical.
- Medical applications, such as ECG and noninvasive blood pressure monitors.
- Industrial process controls and industrial automation systems.
Q & A
- What are the available gain settings for the AD621AR?
The AD621AR has pin-strappable gains of 10 and 100.
- What is the maximum supply current of the AD621AR?
The maximum supply current is 1.3 mA.
- What is the input bias current of the AD621AR?
The input bias current is 500 pA.
- What is the bandwidth of the AD621AR at a gain of 10?
The bandwidth at a gain of 10 is 800 kHz.
- What is the settling time of the AD621AR to 0.01%?
The settling time is 12 µs to 0.01%.
- What are the typical operating temperatures for the AD621AR?
The operating temperature range is -40°C to +85°C.
- What types of packages are available for the AD621AR?
The AD621AR is available in 8-lead SOIC, 8-lead plastic DIP, and 8-lead cerdip packages.
- What is the common-mode rejection ratio (CMRR) of the AD621AR?
The CMRR is 110 dB.
- What are some typical applications for the AD621AR?
Typical applications include signal conditioning, data acquisition systems, weigh scales, transducer interfaces, and medical instrumentation.
- How does the AD621AR compare to discrete in-amp designs?
The AD621AR outperforms discrete in-amp designs with its high accuracy, low gain errors, and low power consumption.
