Overview
The AD8639ARMZ-REEL is a dual wideband, auto-zero operational amplifier produced by Analog Devices Inc. This device is known for its high accuracy, low noise, and rail-to-rail output swing, making it suitable for a variety of precision applications. The AD8639 combines low cost with high performance, eliminating the need for external capacitors and reducing digital switching noise commonly found in chopper-stabilized amplifiers.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage | 5 V to 16 V (single supply), ±2.5 V to ±8 V (dual supply) | |
| Offset Voltage | 3 μV typical, 9 μV maximum | |
| Offset Voltage Drift | 0.01 μV/°C typical, 0.04 μV/°C maximum (except SOT-23) | −40°C ≤ TA ≤ +125°C |
| Input Bias Current | 40 pA maximum | |
| Supply Current | 1.3 mA maximum | |
| Gain | 136 dB typical | |
| CMRR | 133 dB typical | |
| PSRR | 143 dB typical | |
| Output Voltage High | 4.97 V (RL = 10 kΩ to VCM) | −40°C ≤ TA ≤ +125°C |
| Settling Time to 0.1% | 2.5 μs (VIN = 2 V step, CL = 20 pF, RL = 1 kΩ, AV = 1) | |
| Gain Bandwidth Product | 1.35 MHz (RL = 2 kΩ, CL = 20 pF, AV = 1) | |
| Phase Margin | 70 Degrees (RL = 2 kΩ, CL = 20 pF, AV = 1) | |
| Voltage Noise (0.1 Hz to 10 Hz) | 1.2 μV p-p | |
| Voltage Noise Density at 1 kHz | 60 nV/√Hz | |
| Operating Temperature Range | −40°C to +125°C |
Key Features
- Low offset voltage: 3 μV typical, 9 μV maximum
- Low offset voltage drift: 0.01 μV/°C typical, 0.04 μV/°C maximum
- Rail-to-rail output swing
- High gain: 136 dB typical
- High CMRR and PSRR: 133 dB and 143 dB typical, respectively
- Very low input bias current: 40 pA maximum
- Low supply current: 1.3 mA maximum
- No external capacitors required
- Reduced digital switching noise
Applications
- Pressure and position sensors
- Strain gage amplifiers
- Medical instrumentation
- Thermocouple amplifiers
- Automotive sensors (AD8639 qualified for automotive applications)
- Precision references
- Precision current sensing
Q & A
- What is the typical offset voltage of the AD8639ARMZ-REEL?
The typical offset voltage is 3 μV, with a maximum of 9 μV. - What is the operating temperature range of the AD8639ARMZ-REEL?
The operating temperature range is −40°C to +125°C. - Does the AD8639ARMZ-REEL require external capacitors?
No, external capacitors are not required. - What is the gain bandwidth product of the AD8639ARMZ-REEL?
The gain bandwidth product is 1.35 MHz. - What are the typical CMRR and PSRR values of the AD8639ARMZ-REEL?
The typical CMRR is 133 dB, and the typical PSRR is 143 dB. - What is the input bias current of the AD8639ARMZ-REEL?
The input bias current is 40 pA maximum. - What are some common applications of the AD8639ARMZ-REEL?
Common applications include pressure and position sensors, strain gage amplifiers, medical instrumentation, thermocouple amplifiers, and automotive sensors. - Is the AD8639ARMZ-REEL qualified for automotive applications?
Yes, the AD8639 is qualified for automotive applications. - What is the voltage noise density at 1 kHz for the AD8639ARMZ-REEL?
The voltage noise density at 1 kHz is 60 nV/√Hz. - What is the phase margin of the AD8639ARMZ-REEL?
The phase margin is 70 Degrees.
