Overview
The AD621BR, produced by Analog Devices Inc., is a low drift, low power instrumentation amplifier designed for high accuracy and reliability in various applications. It is characterized by its ease of use, low cost, and compact packaging, making it ideal for a wide range of industrial and precision measurement systems. The AD621BR outperforms discrete in-amp implementations with its high performance, small size, and low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain Error (VOUT = ±10 V) | 0.15% | 0.05% | 0.15% | % |
| Nonlinearity (VOUT = –10 V to +10 V, RL = 2 kΩ) | 2 | 10 | 2 | ppm of FS |
| Gain vs. Temperature | -1.5 | ±5 | -1.5 | ppm/°C |
| Total Voltage Offset (RTI) | 50 | 125 | 250 | µV |
| Offset Voltage Drift | 0.6 | 1.0 | 2.5 | µV/°C |
| Input Voltage Noise (1 kHz) | 9 | nV/√Hz | ||
| Bandwidth (G = 10) | 800 kHz | kHz | ||
| Bandwidth (G = 100) | 200 kHz | kHz | ||
| Settling Time to 0.01% | 12 µs | µs | ||
| Supply Current | 1.3 mA | mA | ||
| Input Bias Current | 500 pA | pA | ||
| Supply Voltage Range | ±2.3 V | ±18 V | V | |
| Operating Temperature Range | -40°C | 85°C | °C |
Key Features
- Pin-strappable gains of 10 and 100, allowing for easy gain selection via a single external jumper.
- Low power consumption with a maximum supply current of 1.3 mA.
- High accuracy with low gain errors (0.15% max) and low gain drift (±5 ppm/°C).
- Low noise performance with 9 nV/√Hz input voltage noise at 1 kHz and 0.28 µV p-p noise from 0.1 Hz to 10 Hz.
- Excellent AC specifications, including 800 kHz bandwidth at a gain of 10 and 200 kHz at a gain of 100.
- Compact packaging available in 8-lead DIP, SOIC, and cerdip.
- Low input bias current of 500 pA, making it suitable for high impedance sources.
- Wide power supply range from ±2.3 V to ±18 V.
Applications
- Weigh scales and transducer interface circuits where high accuracy and low drift are critical.
- Data acquisition systems requiring precision and reliability.
- Industrial process controls where stable and accurate signal amplification is necessary.
- Battery-powered and portable equipment due to its low power consumption.
- ECG and blood pressure monitors where low noise and low input bias currents are essential.
Q & A
- What are the available gain settings for the AD621BR?
The AD621BR has pin-strappable gains of 10 and 100, which can be easily set via a single external jumper.
- What is the maximum supply current of the AD621BR?
The maximum supply current is 1.3 mA.
- What is the input voltage noise of the AD621BR at 1 kHz?
The input voltage noise at 1 kHz is 9 nV/√Hz.
- What is the bandwidth of the AD621BR at a gain of 10?
The bandwidth at a gain of 10 is 800 kHz.
- What is the settling time to 0.01% for the AD621BR?
The settling time to 0.01% is 12 µs.
- What is the input bias current of the AD621BR?
The input bias current is 500 pA.
- What are the typical operating temperature ranges for the AD621BR?
The operating temperature range is from -40°C to 85°C.
- What are some common applications of the AD621BR?
Common applications include weigh scales, transducer interface circuits, data acquisition systems, industrial process controls, and battery-powered equipment.
- What types of packaging are available for the AD621BR?
The AD621BR is available in 8-lead DIP, SOIC, and cerdip packages.
- What is the power supply voltage range for the AD621BR?
The power supply voltage range is from ±2.3 V to ±18 V).
