Overview
The AD623AR, produced by Analog Devices Inc., is an integrated instrumentation amplifier designed for high accuracy and flexibility. It operates on single or dual supply voltages ranging from 2.7 V to 12 V, offering rail-to-rail output swing. This amplifier is particularly useful for applications requiring high gain accuracy and low noise, with the ability to program gains from 1 to 1000 using a single external resistor. The AD623AR is optimized for both single and dual supply operations, making it versatile for various applications including medical instrumentation, transducer interfaces, thermocouple amplifiers, and industrial process controls.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.7 | - | 12 | V |
| Gain Range | 1 | - | 1000 | - |
| Gain Error (G = 1) | - | 0.10% | - | % |
| Gain Error (G > 1) | - | 0.35% | - | % |
| Input Offset Voltage (AD623A) | - | 200 μV | - | μV |
| Input Offset Voltage (AD623B) | - | 100 μV | - | μV |
| Input Bias Current | - | 25 nA | - | nA |
| Noise (RTI) at 1 kHz | - | 35 nV/√Hz | - | nV/√Hz |
| Bandwidth (G = 1) | - | 800 kHz | - | kHz |
| Settling Time to 0.01% (G = 10) | - | 20 μs | - | μs |
| Common-Mode Rejection Ratio (CMRR) at 60 Hz | 70 | - | - | dB |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Single or Dual Supply Operation: The AD623AR can operate on supply voltages from 2.7 V to 12 V, including both single and dual polarity power supplies.
- Programmable Gain: Gain can be set from 1 to 1000 using a single external resistor, providing high flexibility in various applications.
- High Accuracy DC Performance: Offers 0.10% gain accuracy at unity gain and 0.35% at higher gains, along with low input offset voltage and drift.
- Low Noise and High CMRR: Features 35 nV/√Hz RTI noise at 1 kHz and a high CMRR of up to 90 dB, ensuring excellent ac specifications.
- Wide Input Common-Mode Range: Can amplify signals with common-mode voltages as low as 150 mV below ground.
- Low Power Consumption: Ideal for battery-powered applications with a quiescent current of 305-550 μA depending on the supply configuration.
- Rail-to-Rail Output Swing: Maximizes dynamic range when operating from low supply voltages.
Applications
- Low Power Medical Instrumentation: Suitable for medical devices requiring high accuracy and low power consumption.
- Transducer Interfaces: Ideal for amplifying signals from various transducers in industrial and medical applications.
- Thermocouple Amplifiers: Used in temperature measurement systems due to its ability to handle low-level signals and high CMRR.
- Industrial Process Controls: Applied in industrial automation for precise signal amplification and conditioning.
- Difference Amplifiers: Utilized in applications requiring differential signal amplification with high accuracy and low noise.
- Low Power Data Acquisition: Suitable for data acquisition systems that require low power consumption and high signal integrity.
Q & A
- What is the supply voltage range for the AD623AR?
The AD623AR operates on supply voltages from 2.7 V to 12 V, including both single and dual polarity power supplies.
- How is the gain of the AD623AR programmed?
The gain of the AD623AR can be programmed from 1 to 1000 using a single external resistor.
- What is the input offset voltage of the AD623AR?
The input offset voltage for the AD623A is 200 μV and for the AD623B is 100 μV.
- What is the common-mode rejection ratio (CMRR) of the AD623AR?
The CMRR of the AD623AR is up to 90 dB at 60 Hz with a 1 kΩ source imbalance.
- What is the bandwidth of the AD623AR at unity gain?
The bandwidth of the AD623AR at unity gain is 800 kHz.
- What is the settling time of the AD623AR to 0.01% at a gain of 10?
The settling time to 0.01% at a gain of 10 is 20 μs.
- Can the AD623AR operate with common-mode voltages below ground?
Yes, the AD623AR can amplify signals with common-mode voltages as low as 150 mV below ground.
- What are the typical applications of the AD623AR?
The AD623AR is used in low power medical instrumentation, transducer interfaces, thermocouple amplifiers, industrial process controls, difference amplifiers, and low power data acquisition.
- What is the quiescent current of the AD623AR?
The quiescent current of the AD623AR ranges from 305 μA to 550 μA depending on the supply configuration.
- Is the AD623AR suitable for battery-powered applications?
Yes, the AD623AR is ideal for battery-powered applications due to its low power consumption and rail-to-rail output swing.
