Overview
The AD8639ARZ is a dual-channel, wide bandwidth, auto-zero operational amplifier produced by Analog Devices Inc. This amplifier is known for its rail-to-rail output swing and low noise characteristics, making it suitable for a variety of precision applications. It combines low cost with high accuracy and low noise, eliminating the need for external capacitors. The AD8639ARZ is particularly beneficial in reducing digital switching noise common in chopper-stabilized amplifiers, thus enhancing signal integrity and accuracy.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 9 μV (maximum) | μV |
| Offset Drift | 0.04 μV/°C (maximum) | μV/°C |
| Supply Voltage | 5 V to 16 V (single-supply) or ±2.5 V to ±8 V (dual-supply) | V |
| Gain | 136 dB (typical) | dB |
| CMRR | 133 dB (typical) | dB |
| PSRR | 143 dB (typical) | dB |
| Input Bias Current | 40 pA (maximum) | pA |
| Supply Current | 1.3 mA (maximum) | mA |
| Operating Temperature Range | -40°C to +125°C | °C |
| Package Type | SOIC-8 | |
| Gain Bandwidth Product | 1.35 MHz | MHz |
| Phase Margin | 70 Degrees | Degrees |
| Voltage Noise (0.1 Hz to 10 Hz) | 1.2 μV p-p | μV p-p |
| Voltage Noise Density at 1 kHz | 60 nV/√Hz | nV/√Hz |
Key Features
- Low Offset Voltage and Drift: Maximum offset voltage of 9 μV and drift of 0.04 μV/°C, ensuring high accuracy over temperature variations.
- Rail-to-Rail Output Swing: Operates from 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply, maximizing signal-to-noise ratio.
- High Gain and CMRR/PSRR: Typical gain of 136 dB, CMRR of 133 dB, and PSRR of 143 dB, providing high stability and rejection of common-mode and power supply noise.
- Low Input Bias Current: Maximum input bias current of 40 pA, suitable for high-impedance sources.
- Low Supply Current: Maximum supply current of 1.3 mA, making it power-efficient.
- No External Capacitors Required: Simplifies circuit design by eliminating the need for external capacitors.
- Low Noise: Voltage noise of 1.2 μV p-p (0.1 Hz to 10 Hz) and noise density of 60 nV/√Hz at 1 kHz, ideal for precision applications.
Applications
- Pressure and Position Sensors: High accuracy and low noise make it suitable for precise measurement in sensors.
- Strain Gage Amplifiers: Low drift and high CMRR ensure reliable performance in strain gage applications.
- Medical Instrumentation: Used in medical devices requiring high precision and low noise.
- Thermocouple Amplifiers: Suitable for thermocouple applications due to its low offset and drift.
- Automotive Sensors: Qualified for automotive applications, providing reliable performance in harsh environments.
- Precision References and Current Sensing: Ideal for precision current sensing and reference applications.
Q & A
- What is the maximum offset voltage of the AD8639ARZ?
The maximum offset voltage is 9 μV.
- What is the operating temperature range of the AD8639ARZ?
The operating temperature range is -40°C to +125°C.
- Does the AD8639ARZ require external capacitors?
No, the AD8639ARZ does not require external capacitors.
- What is the typical gain of the AD8639ARZ?
The typical gain is 136 dB.
- What is the input bias current of the AD8639ARZ?
The maximum input bias current is 40 pA.
- Is the AD8639ARZ RoHS compliant?
- What is the package type of the AD8639ARZ?
The package type is SOIC-8.
- What are some common applications of the AD8639ARZ?
- What is the gain bandwidth product of the AD8639ARZ?
- What is the phase margin of the AD8639ARZ?
