Overview
The AD8639ARMZ-R2, produced by Analog Devices Inc., is a high-performance, auto-zero operational amplifier. This device is part of the AD8638 and AD8639 family, known for their low cost, high accuracy, and low noise characteristics. The AD8639 is particularly suited for applications requiring minimal offset voltage, drift, and bias current. It operates over a wide supply voltage range from 5 V to 16 V in single-supply mode or ±2.5 V to ±8 V in dual-supply mode, making it versatile for various industrial and medical applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VSY | 5 | 16 | V | ||
| Input Offset Voltage | VOS | −40°C ≤ TA ≤ +125°C | 3 | μV | ||
| Offset Voltage Drift | ∆VOS/∆T | −40°C ≤ TA ≤ +125°C (Except SOT-23) | 0.01 | 0.06 | μV/°C | |
| Input Bias Current | IB | −40°C ≤ TA ≤ +125°C | 40 | pA | ||
| Common-Mode Rejection Ratio | CMRR | −40°C ≤ TA ≤ +125°C | 127 | 133 | 142 | dB |
| Power Supply Rejection Ratio | PSRR | −40°C ≤ TA ≤ +125°C | 127 | 143 | 142 | dB |
| Gain Bandwidth Product | GBP | RL = 2 kΩ, CL = 20 pF, AV = 1 | 1.35 | MHz | ||
| Slew Rate | SR | RL = 10 kΩ, CL = 20 pF, AV = 1 | 2.5 | V/μs | ||
| Supply Current | ISY | −40°C ≤ TA ≤ +125°C | 1.3 | mA |
Key Features
- Auto-Zero Technology: Combines low cost with high accuracy and low noise, eliminating the need for external capacitors.
- Rail-to-Rail Output Swing: Operates from 5 V to 16 V in single-supply mode or ±2.5 V to ±8 V in dual-supply mode.
- Low Offset and Drift: Typical offset voltage of 3 μV and drift of 0.01 μV/°C.
- High Gain and Rejection Ratios: High gain (136 dB typical), CMRR (133 dB typical), and PSRR (143 dB typical).
- Low Input Bias Current: Maximum input bias current of 40 pA.
- Low Supply Current: Maximum supply current of 1.3 mA.
- No External Components Required: Simplifies circuit design and reduces component count.
- Qualified for Automotive Applications: Meets stringent automotive standards.
Applications
- Pressure and Position Sensors: Accurate signal amplification in sensor applications.
- Strain Gage Amplifiers: High precision in strain gage measurements.
- Medical Instrumentation: Reliable performance in medical devices requiring low noise and high accuracy.
- Thermocouple Amplifiers: Precise temperature measurements.
- Automotive Sensors: Qualified for use in automotive systems.
- Precision Current Sensing: Accurate current measurements in various applications.
- Precision References: Used in precision reference circuits.
Q & A
- What is the typical offset voltage of the AD8639ARMZ-R2?
The typical offset voltage is 3 μV.
- What is the operating temperature range of the AD8639ARMZ-R2?
The operating temperature range is from −40°C to +125°C.
- What is the maximum input bias current of the AD8639ARMZ-R2?
The maximum input bias current is 40 pA.
- Does the AD8639ARMZ-R2 require external capacitors?
No, external capacitors are not required.
- What are the key applications of the AD8639ARMZ-R2?
Key applications include pressure and position sensors, strain gage amplifiers, medical instrumentation, thermocouple amplifiers, and automotive sensors.
- What is the gain bandwidth product (GBP) of the AD8639ARMZ-R2?
The gain bandwidth product is typically 1.35 MHz.
- What is the slew rate of the AD8639ARMZ-R2?
The slew rate is typically 2.5 V/μs.
- Is the AD8639ARMZ-R2 qualified for automotive applications?
Yes, it is qualified for automotive applications.
- What is the maximum supply current of the AD8639ARMZ-R2?
The maximum supply current is 1.3 mA.
- What is the common-mode rejection ratio (CMRR) of the AD8639ARMZ-R2?
The CMRR is typically 133 dB.
