Overview
The AD621AN, produced by Analog Devices Inc., is a low drift, low power instrumentation amplifier designed for high accuracy and ease of use. It is ideally suited for a wide range of applications, including precision data acquisition systems, weigh scales, transducer interfaces, and industrial process controls. The AD621AN offers a unique combination of high performance, small size, and low power consumption, outperforming discrete in-amp implementations.
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, VS = ±15 V) | 75 | 250 | 50 | µV |
| Offset Voltage Drift (VS = ±5 V to ±15 V) | 1.0 | 2.5 | 0.6 | µV/°C |
| Voltage Noise (RTI, 1 kHz) | 13 | 17 | 13 | nV/√Hz |
| 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
- 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, making it suitable for battery-powered and portable equipment.
- High accuracy with low gain errors and low gain drift, specified as ±5 ppm/°C.
- Low noise performance with 9 nV/√Hz at 1 kHz and 0.28 µV p-p noise from 0.1 Hz to 10 Hz.
- Excellent DC performance with a total gain error of 0.15% max and an offset voltage drift of 1.0 µV/°C max.
- Compact packaging in 8-pin SOIC, 8-pin plastic DIP, or 8-pin cerdip, ideal for space-constrained applications.
Applications
- Weigh scales and transducer interface circuits, where high accuracy and low drift are critical.
- Precision data acquisition systems, requiring high total accuracy and low noise.
- Industrial process controls, where reliability and precision are essential.
- Battery-powered and portable equipment, benefiting from the low power consumption.
- ECG and medical instrumentation, where low input bias currents and low noise are important.
Q & A
- What is the typical supply current of the AD621AN? The typical supply current is 1.3 mA.
- How do you set the gain on the AD621AN? The gain can be set to 10 or 100 using a single external jumper between Pins 1 and 8.
- What is the bandwidth of the AD621AN 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 AD621AN? The settling time to 0.01% is 12 µs.
- What is the operating temperature range for the AD621AN? The operating temperature range is -40°C to +85°C.
- What is the input voltage noise of the AD621AN at 1 kHz? The input voltage noise at 1 kHz is 9 nV/√Hz.
- What are the common applications of the AD621AN? Common applications include weigh scales, transducer interfaces, precision data acquisition systems, industrial process controls, and battery-powered equipment.
- What is the maximum total offset voltage for the AD621AN? The maximum total offset voltage is 125 µV.
- How does the AD621AN perform in terms of gain drift? The AD621AN has a gain drift of ±5 ppm/°C.
- What are the packaging options for the AD621AN? The AD621AN is available in 8-pin SOIC, 8-pin plastic DIP, and 8-pin cerdip packages.
