Overview
The AD621BNZ, produced by Analog Devices Inc., is a low-cost, low-power, high-accuracy instrumentation amplifier. It is designed for a wide range of applications, offering high performance, small size, and low power consumption, making it superior to discrete in-amp implementations. The AD621BNZ is easy to use, with pin-strappable gains of 10 and 100, and all errors specified for total system performance. This amplifier is particularly suited for applications where power dissipation, size, and weight are critical, such as in portable or remote devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain Error (VOUT = ±10 V) | 0.05 | 0.15 | 0.15 | % |
| Nonlinearity (VOUT = –10 V to +10 V, RL = 2 kΩ) | 2 | 10 | 10 | ppm of FS |
| Gain vs. Temperature | –1.5 | ±5 | ±5 | ppm/°C |
| Total Offset Voltage (VS = ±15 V) | 50 | 125 | 125 | µV |
| Offset Voltage Drift (VS = ±5 V to ±15 V) | 0.6 | 1.5 | 1.5 | µV/°C |
| Voltage Noise (1 kHz) | 9 | - | - | nV/√Hz |
| Voltage Noise (0.1 Hz to 10 Hz) | 0.28 | - | - | µV p-p |
| Bandwidth (G = 10) | 800 | - | - | kHz |
| Bandwidth (G = 100) | 200 | - | - | kHz |
| Settling Time to 0.01% | 12 | - | - | µs |
| Supply Current | - | - | 1.3 | mA |
| Operating Temperature Range | –40 | - | 85 | °C |
Key Features
- Easy to Use: Pin-strappable gains of 10 and 100, with all errors specified for total system performance.
- Low Power: Maximum supply current of 1.3 mA, making it suitable for battery-powered and portable equipment.
- High Accuracy: Low gain error (0.15% max), low gain drift (±5 ppm/°C), and low offset voltage (125 µV max).
- Low Noise: Voltage noise of 9 nV/√Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz.
- Excellent AC Specifications: Bandwidth of 800 kHz at a gain of 10 and 200 kHz at a gain of 100, with a settling time of 12 µs to 0.01%.
- Compact Packaging: Available in 8-lead PDIP, SOIC, and CerDIP packages.
- Wide Power Supply Range: Operates from ±2.3 V to ±18 V.
Applications
- Weigh Scales: Precision data acquisition systems.
- Transducer Interface: High accuracy required for transducer interface circuits.
- Data Acquisition Systems: Industrial and medical applications requiring high total accuracy.
- Industrial Process Controls: Applications where precision and low noise are critical.
- Battery-Powered and Portable Equipment: Devices where power dissipation, size, and weight are critical.
- ECG and Blood Pressure Monitors: Applications requiring low noise and low input bias currents.
Q & A
- What are the pin-strappable gains of the AD621BNZ?
The AD621BNZ has pin-strappable gains of 10 and 100.
- What is the maximum supply current of the AD621BNZ?
The maximum supply current is 1.3 mA.
- What is the voltage noise specification of the AD621BNZ at 1 kHz?
The voltage noise is 9 nV/√Hz at 1 kHz.
- What is the bandwidth of the AD621BNZ at a gain of 10?
The bandwidth is 800 kHz at a gain of 10.
- What is the settling time of the AD621BNZ to 0.01%?
The settling time is 12 µs to 0.01%.
- What are the typical operating temperature ranges for the AD621BNZ?
The operating temperature range is –40°C to +85°C.
- What are the common applications of the AD621BNZ?
Common applications include weigh scales, transducer interface, data acquisition systems, industrial process controls, and battery-powered equipment.
- What is the input bias current specification of the AD621BNZ?
The input bias current is 1.5 nA max over the full industrial temperature range.
- What is the total offset voltage of the AD621BNZ?
The total offset voltage is 125 µV max.
- How does the AD621BNZ perform in terms of gain drift?
The gain drift is ±5 ppm/°C.
