Overview
The AD621ARZ-RL, produced by Analog Devices Inc., is a low-cost, low-power, high-accuracy instrumentation amplifier. It is designed for a wide range of applications, including precision data acquisition systems, weigh scales, transducer interface circuits, and industrial process controls. The AD621 is known for its ease of use, high performance, and compact size, making it an ideal choice for applications where power dissipation, size, and weight are critical.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain | 10, 100 | - |
| Gain Error | 0.15% (Max) | % |
| Gain Drift | ±5 ppm/°C | ppm/°C |
| Total Offset Voltage | 125 µV (Max) | µV |
| Offset Voltage Drift | 1.0 µV/°C (Max) | µV/°C |
| 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 Range | –40°C to +85°C | °C |
| Package Type | 8-Lead SOIC | - |
Key Features
- Easy to Use: Pin-strappable gains of 10 and 100.
- High Performance: Outperforms discrete in-amp designs with low gain errors and low gain drift.
- Low Power: Maximum supply current of 1.3 mA.
- Low Noise: 9 nV/√Hz input voltage noise at 1 kHz and 0.28 µV p-p noise from 0.1 Hz to 10 Hz.
- Compact Packaging: Available in 8-Lead SOIC, 8-Lead PDIP, and 8-Lead CerDIP packages.
- Excellent DC Performance: Total gain error of 0.15%, total offset voltage of 125 µV, and offset voltage drift of 1.0 µV/°C.
- Excellent AC Specifications: Bandwidth of 800 kHz at G = 10 and 200 kHz at G = 100, with a settling time of 12 µs to 0.01%.
Applications
- Weigh Scales: Precision data acquisition systems.
- Transducer Interface and Data Acquisition Systems: High accuracy and low noise make it ideal for these applications.
- Industrial Process Controls: Suitable for applications requiring high total accuracy.
- Battery-Powered and Portable Equipment: Low power consumption and compact size are beneficial for portable devices.
- ECG and Blood Pressure Monitors: Low input bias currents and low noise are advantageous in medical monitoring applications.
Q & A
- What are the available gain settings for the AD621ARZ-RL?
The AD621ARZ-RL has pin-strappable gains of 10 and 100.
- What is the maximum supply current of the AD621ARZ-RL?
The maximum supply current is 1.3 mA.
- What is the input voltage noise of the AD621ARZ-RL at 1 kHz?
The input voltage noise is 9 nV/√Hz at 1 kHz.
- What are the bandwidth specifications for the AD621ARZ-RL?
The bandwidth is 800 kHz at a gain of 10 and 200 kHz at a gain of 100.
- What is the settling time of the AD621ARZ-RL to 0.01%?
The settling time is 12 µs to 0.01%.
- What are the operating temperature ranges for the AD621ARZ-RL?
The operating temperature range is –40°C to +85°C.
- In what packages is the AD621ARZ-RL available?
The AD621ARZ-RL is available in 8-Lead SOIC, 8-Lead PDIP, and 8-Lead CerDIP packages.
- What are some typical applications of the AD621ARZ-RL?
Typical applications include weigh scales, transducer interface and data acquisition systems, industrial process controls, and battery-powered and portable equipment.
- How does the AD621ARZ-RL perform in terms of DC specifications?
The AD621ARZ-RL has a total gain error of 0.15%, a total offset voltage of 125 µV, and an offset voltage drift of 1.0 µV/°C.
- Is the AD621ARZ-RL suitable for medical monitoring applications?
Yes, it is suitable due to its low input bias currents and low noise, making it ideal for applications like ECG and blood pressure monitors.
