Overview
The AD623AN, 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 user flexibility with single gain set resistor programming and conforms to the 8-lead industry standard pinout configuration. With no external resistor, the AD623AN is configured for unity gain (G = 1), and with an external resistor, it can be programmed for gains of up to 1000.
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 Drift (AD623A) | - | - | 2 μV/°C | μV/°C |
| 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 | 80 | 90 | dB |
| Operating Temperature Range | -40 | - | 85 | °C |
| Quiescent Current (Dual Supply) | 375 | - | 550 | μA |
Key Features
- Single or dual supply operation with supply voltages from 2.7 V to 12 V.
- Rail-to-rail output swing.
- Single gain set resistor programming for gains of 1 to 1000.
- High accuracy dc performance with 0.10% gain error at G = 1 and 0.35% at G > 1.
- Low input offset voltage and drift.
- Low noise: 35 nV/√Hz RTI noise at 1 kHz.
- Wide input common-mode range, extending 150 mV below ground.
- High CMRR that increases with increasing gain, rejecting line noise and harmonics.
- Low power consumption with a maximum quiescent current of 550 μA.
- Fast settling time of 20 μs to 0.01% (G = 10).
Applications
- Low power medical instrumentation.
- Transducer interfaces.
- Thermocouple amplifiers.
- Industrial process controls.
- Difference amplifiers.
- Low power data acquisition systems.
Q & A
- What is the supply voltage range for the AD623AN?
The AD623AN operates with supply voltages from 2.7 V to 12 V.
- How is the gain set for the AD623AN?
The gain is set using a single external resistor, allowing for gains from 1 to 1000.
- What is the input offset voltage of the AD623AN?
The input offset voltage for the AD623A is up to 200 μV, and for the AD623B, it is up to 100 μV.
- What is the common-mode rejection ratio (CMRR) of the AD623AN?
The CMRR is at least 70 dB at G = 1 and 90 dB at G = 10 at 60 Hz with a 1 kΩ source imbalance.
- What is the bandwidth of the AD623AN at unity gain?
The bandwidth at unity gain (G = 1) is 800 kHz.
- How long does it take for the AD623AN to settle to 0.01% at a gain of 10?
The settling time to 0.01% at a gain of 10 is 20 μs.
- What is the operating temperature range for the AD623AN?
The operating temperature range is from -40°C to +85°C.
- What is the maximum quiescent current of the AD623AN?
The maximum quiescent current is 550 μA for dual supply operation.
- What are some typical applications of the AD623AN?
Typical applications include low power medical instrumentation, transducer interfaces, thermocouple amplifiers, industrial process controls, and low power data acquisition systems.
- What is the input bias current of the AD623AN?
The maximum input bias current is 25 nA.
