Overview
The AD8639ARMZ-R7 is a dual-channel, wide bandwidth, auto-zero operational amplifier manufactured by Analog Devices Inc. This amplifier is designed to combine low cost with high accuracy and low noise, making it suitable for a variety of precision applications. It features a rail-to-rail output swing and operates over a wide supply voltage range, from 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply. The AD8639 is particularly noted for its very low offset voltage, drift, and bias current, which are critical for applications where error sources cannot be tolerated.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 3 μV (typ), 9 μV (max) | μV |
| Offset Drift | 0.01 μV/°C (typ), 0.04 μV/°C (max) | μV/°C |
| Supply Voltage | 5 V to 16 V (single-supply), ±2.5 V to ±8 V (dual-supply) | V |
| Gain | 136 dB (typ) | dB |
| CMRR | 133 dB (typ) | dB |
| PSRR | 143 dB (typ) | dB |
| Input Bias Current | 40 pA (max) | pA |
| Supply Current | 1.3 mA (max) | mA |
| Gain Bandwidth Product | 1.35 MHz (typ) | MHz |
| Slew Rate | 2.5 V/μs (typ) | V/μs |
| Operating Temperature Range | −40°C to +125°C | °C |
| Packaging | 8-lead MSOP |
Key Features
- Rail-to-rail output swing to maximize signal-to-noise ratio (SNR)
- Very low offset voltage and drift
- High gain and high common-mode rejection ratio (CMRR)
- High power supply rejection ratio (PSRR)
- Very low input bias current
- Low supply current
- No external capacitors required
- Reduces digital switching noise found in most chopper-stabilized amplifiers
- Qualified for automotive applications
Applications
- Pressure and position sensors
- Strain gage amplifiers
- Medical instrumentation
- Thermocouple amplifiers
- Automotive sensors
- Precision references
- Precision current sensing
Q & A
- What is the typical offset voltage of the AD8639ARMZ-R7?
The typical offset voltage is 3 μV, with a maximum of 9 μV.
- What is the operating temperature range of the AD8639ARMZ-R7?
The operating temperature range is −40°C to +125°C.
- What are the supply voltage options for the AD8639ARMZ-R7?
The AD8639ARMZ-R7 can operate from 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply.
- What is the gain bandwidth product of the AD8639ARMZ-R7?
The gain bandwidth product is 1.35 MHz (typical).
- Is the AD8639ARMZ-R7 suitable for automotive applications?
- What is the typical slew rate of the AD8639ARMZ-R7?
The typical slew rate is 2.5 V/μs.
- Does the AD8639ARMZ-R7 require external capacitors?
No, the AD8639ARMZ-R7 does not require external capacitors.
- What are some common applications of the AD8639ARMZ-R7?
- What is the input bias current of the AD8639ARMZ-R7?
The input bias current is 40 pA (maximum).
- What is the packaging style of the AD8639ARMZ-R7?
The AD8639ARMZ-R7 is available in an 8-lead MSOP package).
