Overview
The AD621SQ/883B is a low drift, low power instrumentation amplifier produced by Analog Devices Inc. This component is designed to offer high performance, low power consumption, and ease of use, making it ideal for a wide range of applications. It is particularly suited for portable or remote applications where power dissipation, size, and weight are critical. The AD621 features pin-strappable gains of 10 and 100, all errors specified for total system performance, and outperforms discrete in-amp implementations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain Error (VOUT = ±10 V) | 0.15% | % |
| Gain Nonlinearity (VOUT = –10 V to +10 V) | 2-10 ppm of FS | ppm |
| Gain vs. Temperature | ±5 ppm/°C | ppm/°C |
| Total Offset Voltage (RTI) | 50-250 µV | µV |
| Offset Voltage Drift | 0.6-2.5 µV/°C | µV/°C |
| Voltage Noise (RTI) at 1 kHz | 9 nV/√Hz | nV/√Hz |
| Bandwidth (G = 10) | 800 kHz | kHz |
| Bandwidth (G = 100) | 200 kHz | kHz |
| Settling Time to 0.01% | 12 µs | µs |
| Supply Current | 0.9-1.3 mA | mA |
| Operating Temperature Range | –55°C to +125°C | °C |
| Package Type | 8-Lead CerDIP |
Key Features
- Ease of use with pin-strappable gains of 10 and 100.
- All errors specified for total system performance.
- Higher performance than discrete in-amp designs.
- Available in 8-lead DIP, SOIC, and CerDIP packages.
- Low power consumption with a maximum supply current of 1.3 mA.
- Wide power supply range from ±2.3 V to ±18 V.
- Excellent DC performance with low gain error and drift.
- Low noise characteristics, including 9 nV/√Hz voltage noise at 1 kHz.
- High accuracy and stability, making it suitable for precision data acquisition systems.
Applications
- Precision data acquisition systems.
- Transducer interface circuits.
- Weigh scales.
- ECG and blood pressure monitors.
- Portable or remote applications where power dissipation, size, and weight are critical.
Q & A
- What are the available gain settings for the AD621SQ/883B?
The AD621SQ/883B has pin-strappable gains of 10 and 100.
- What is the maximum supply current of the AD621SQ/883B?
The maximum supply current is 1.3 mA.
- What is the operating temperature range for the AD621SQ/883B?
The operating temperature range is –55°C to +125°C.
- What types of packages are available for the AD621?
The AD621 is available in 8-lead DIP, SOIC, and CerDIP packages.
- What is the voltage noise specification at 1 kHz for the AD621?
The voltage noise at 1 kHz is 9 nV/√Hz.
- How does the AD621 perform in terms of DC accuracy?
The AD621 has excellent DC performance with a total gain error of 0.15% and a gain drift of ±5 ppm/°C.
- What are some common applications for the AD621?
Common applications include precision data acquisition systems, transducer interface circuits, weigh scales, and ECG and blood pressure monitors.
- What is the settling time to 0.01% for the AD621?
The settling time to 0.01% is 12 µs.
- Does the AD621 have any special design features for low noise and low input bias currents?
Yes, the AD621 features low noise and low input bias currents, making it ideal for applications requiring high precision.
- What tools are available to support the design process with the AD621?
Analog Devices provides tools such as the In-Amp Diamond Plot Tool and the In-Amp Error Calculator to support the design process.
