Overview
The AD623AR-REEL, produced by Analog Devices Inc., is an integrated single- or dual-supply instrumentation amplifier. It is designed to deliver rail-to-rail output swing using supply voltages from 2.7 V to 12 V. This amplifier offers superior user flexibility with single gain set resistor programming and conforms to the 8-lead industry standard pinout configuration. The AD623AR-REEL is ideal for applications requiring high accuracy, low power consumption, and a wide input common-mode range. It is particularly suited for battery-powered devices due to its low power consumption and rail-to-rail output swing, which maximizes the dynamic range when operating from low supply voltages.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.7 | - | 12 | V |
| Gain Error (G = 1) | - | 0.10% | - | % |
| Gain Error (G > 1) | - | 0.35% | - | % |
| Input Offset Voltage (AD623A) | - | 200 | - | μV |
| Input Offset Voltage (AD623B) | - | 100 | - | μV |
| Input Bias Current | - | 25 | - | nA |
| Noise (RTI) at 1 kHz | - | 35 | - | nV/√Hz |
| Bandwidth (G = 1) | - | 800 kHz | - | kHz |
| Settling Time to 0.01% (G = 10) | - | 20 μs | - | μs |
| Quiescent Current (Single Supply) | - | 480 | - | μA |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Single or Dual Supply Operation: The AD623 can operate from a single supply (3 V to 12 V) or dual supplies (±2.5 V to ±6 V).
- Rail-to-Rail Output Swing: Maximizes the dynamic range when operating from low supply voltages.
- High Accuracy DC Performance: 0.10% gain error at G = 1 and 0.35% gain error at G > 1.
- Low Power Consumption: Maximum quiescent current of 550 μA.
- Gain Set with One External Resistor: Programmable gains from 1 to 1000 using a single external resistor.
- Wide Input Common-Mode Range: Can amplify signals with common-mode voltages as low as 150 mV below ground.
- High CMRR: Minimum CMRR of 70 dB at G = 1 and 90 dB at G = 10 at 60 Hz with 1 kΩ source imbalance.
- Fast Settling Time: 20 μs settling time to 0.01% for G = 10.
Applications
- Low Power Medical Instrumentation: Suitable for medical devices requiring low power and high accuracy.
- Transducer Interfaces: Ideal for interfacing with various transducers due to its high CMRR and wide input common-mode range.
- Thermocouple Amplifiers: Used in thermocouple applications where high accuracy and low noise are critical.
- Industrial Process Controls: Applicable in industrial settings for process control and monitoring.
- Difference Amplifiers: Can be used as a difference amplifier in various signal processing applications.
- Low Power Data Acquisition: Suitable for data acquisition systems that require low power consumption and high accuracy.
Q & A
- What is the supply voltage range for the AD623?
The AD623 can operate from a single supply of 2.7 V to 12 V or dual supplies of ±2.5 V to ±6 V.
- How is the gain set for the AD623?
The gain is set using a single external resistor, allowing gains from 1 to 1000.
- What is the maximum quiescent current of the AD623?
The maximum quiescent current is 550 μA.
- What is the input offset voltage of the AD623A and AD623B?
The input offset voltage is 200 μV for the AD623A and 100 μV for the AD623B.
- What is the bandwidth of the AD623 at unity gain?
The bandwidth at unity gain is 800 kHz.
- What is the settling time of the AD623 to 0.01% at G = 10?
The settling time is 20 μs.
- What is the common-mode rejection ratio (CMRR) of the AD623?
The CMRR is a minimum of 70 dB at G = 1 and 90 dB at G = 10 at 60 Hz with 1 kΩ source imbalance.
- Can the AD623 operate with common-mode voltages below ground?
Yes, the AD623 can amplify signals with common-mode voltages as low as 150 mV below ground.
- What are some typical applications of the AD623?
Typical applications include low power medical instrumentation, transducer interfaces, thermocouple amplifiers, industrial process controls, difference amplifiers, and low power data acquisition.
- How does the AD623 handle line noise and harmonics?
The AD623 rejects line noise and harmonics due to its high CMRR, which remains constant up to 200 Hz.
