Overview
The AD621BRZ-RL, produced by Analog Devices Inc., is a low-cost, low-power, high-accuracy instrumentation amplifier. It is designed to be easy to use and is suitable for a wide range of applications. The AD621 features a unique combination of high performance, small size, and low power consumption, outperforming discrete in-amp implementations. It is available in 8-lead SOIC packages and is particularly beneficial for portable or remote applications where power dissipation, size, and weight are critical.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Supply Current | 1.3 | mA (max) |
| Supply Voltage Range | ±2.3 V to ±18 V | V |
| 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 (G = 10) | 800 kHz | kHz |
| Bandwidth (G = 100) | 200 kHz | kHz |
| Settling Time to 0.01% | 12 µs | µs |
Key Features
- Easy to Use: Pin-strappable gains of 10 and 100, with all errors specified for total system performance.
- High Performance: Outperforms discrete in-amp designs with high functionality, low gain errors, and low gain drift.
- Low Power: Maximum supply current of 1.3 mA, making it suitable for battery-powered and portable equipment.
- Low Noise: Input voltage noise of 9 nV/√Hz at 1 kHz and 0.28 µV p-p noise from 0.1 Hz to 10 Hz.
- Excellent DC Performance: Total gain error of 0.15% max, total gain drift of ±5 ppm/°C, and total offset voltage of 125 µV max.
- Compact Packaging: Available in 8-lead SOIC, 8-lead plastic DIP, and 8-lead cerdip packages.
Applications
- Weigh scales and precision data acquisition systems.
- Transducer interface circuits.
- Industrial process controls.
- Battery-powered and portable equipment.
- ECG and blood pressure monitors due to its low noise and low input bias currents.
Q & A
- What are the available gain settings for the AD621?
The AD621 has pin-strappable gains of 10 and 100, which can be set via external pin strapping.
- What is the maximum supply current of the AD621?
The maximum supply current is 1.3 mA.
- What is the input voltage noise of the AD621 at 1 kHz?
The input voltage noise is 9 nV/√Hz at 1 kHz.
- What are the typical bandwidths for the AD621 at different gains?
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 AD621 to 0.01%?
The settling time is 12 µs.
- In what packages is the AD621 available?
The AD621 is available in 8-lead SOIC, 8-lead plastic DIP, and 8-lead cerdip packages.
- What are some typical applications of the AD621?
Typical applications include weigh scales, transducer interface circuits, industrial process controls, and battery-powered equipment.
- How does the AD621 perform in terms of DC specifications?
The AD621 has a total gain error of 0.15% max, total gain drift of ±5 ppm/°C, and total offset voltage of 125 µV max.
- What is the input bias current of the AD621?
The input bias current is extremely low, thanks to Superβeta processing, which provides 10× lower input bias current compared to other devices.
- Can the AD621 be used in high-source impedance applications?
Yes, the AD621 is suitable for applications with high source impedances, such as ECG and blood pressure monitors, due to its low noise and low input bias currents.
