Overview
The AD8638ARJZ-R2, produced by Analog Devices Inc., is a 16 V auto-zero, rail-to-rail output operational amplifier. This device is part of the AD8638/AD8639 family, which combines low cost with high accuracy and low noise. The AD8638 is a single-channel amplifier, while the AD8639 is a dual-channel version, both featuring wide bandwidth and auto-zero technology. These amplifiers are designed to operate from 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply, making them versatile for various applications. They are particularly suited for environments where high precision and low drift are critical.
Key Specifications
| Parameter | Typical Value | Maximum Value |
|---|---|---|
| Supply Voltage | 5 V to 16 V (single-supply), ±2.5 V to ±8 V (dual-supply) | 16 V |
| Offset Voltage | 3 μV | - |
| Offset Voltage Drift | 0.01 μV/°C (except SOT-23), 0.04 μV/°C (SOT-23) | 0.06 μV/°C (except SOT-23), 0.15 μV/°C (SOT-23) |
| Input Bias Current | - | 40 pA |
| Supply Current | - | 1.3 mA |
| Gain Bandwidth Product | 1.35 MHz | - |
| Phase Margin | 70 Degrees | - |
| Voltage Noise Density | 60 nV/√Hz at 1 kHz | - |
| Voltage Noise (0.1 Hz to 10 Hz) | 1.2 μV p-p | - |
| Input Resistance | 22.5 TΩ | - |
| Input Capacitance (Differential Mode) | 4 pF | - |
| Input Capacitance (Common Mode) | 1.7 pF | - |
| Operating Temperature Range | -40°C to +125°C | - |
Key Features
- Rail-to-rail output swing
- Auto-zero technology for low offset voltage and drift
- High gain: 136 dB typical
- High common-mode rejection ratio (CMRR): 133 dB typical
- High power supply rejection ratio (PSRR): 143 dB typical
- Very low input bias current: 40 pA maximum
- Low supply current: 1.3 mA maximum
- No external capacitors required
- Reduced digital switching noise compared to chopper-stabilized amplifiers
Applications
- Pressure and position sensors
- Strain gage amplifiers
- Medical instrumentation
- Thermocouple amplifiers
- Automotive sensors (AD8639 is qualified for automotive applications)
- Precision references
- Precision current sensing
Q & A
- What is the typical offset voltage of the AD8638ARJZ-R2? The typical offset voltage is 3 μV.
- What is the operating temperature range of the AD8638ARJZ-R2? The operating temperature range is -40°C to +125°C.
- Does the AD8638ARJZ-R2 require external capacitors? No, external capacitors are not required.
- What is the gain bandwidth product of the AD8638ARJZ-R2? The gain bandwidth product is 1.35 MHz.
- What are the typical applications of the AD8638ARJZ-R2? Typical applications include pressure and position sensors, strain gage amplifiers, medical instrumentation, thermocouple amplifiers, and automotive sensors.
- What is the maximum input bias current of the AD8638ARJZ-R2? The maximum input bias current is 40 pA.
- What is the phase margin of the AD8638ARJZ-R2? The phase margin is 70 Degrees.
- What is the voltage noise density of the AD8638ARJZ-R2 at 1 kHz? The voltage noise density at 1 kHz is 60 nV/√Hz.
- Is the AD8638ARJZ-R2 suitable for automotive applications? The AD8639, which is the dual-channel version, is qualified for automotive applications, but the AD8638 is not specifically mentioned as such.
- What is the maximum supply current of the AD8638ARJZ-R2? The maximum supply current is 1.3 mA.
