Overview
The AD8675ARMZ-R2 is a precision operational amplifier produced by Analog Devices Inc. This amplifier is renowned for its ultralow offset, drift, and voltage noise, combined with very low input bias currents across its full operating range. It features a rail-to-rail output, wide bandwidth, and low power consumption, making it an ideal choice for applications requiring high precision and low noise.
The AD8675 is part of a series of low noise op amps offered by Analog Devices, and it is particularly suited for applications where large error sources cannot be tolerated. The amplifier is available in compact packages such as the 8-lead MSOP and the 8-lead narrow SOIC, both of which are RoHS compliant.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Offset Voltage | VOS | 10 | 75 | 240 | µV |
| Offset Voltage Drift | ΔVOS/ΔT | 0.2 | 0.6 | µV/°C | |
| Input Bias Current | IB | -2 | 0.5 | 2 | nA |
| Input Offset Current | IOS | -1 | 0.1 | 1 | nA |
| Input Voltage Range | IVR | -3.0 | 3.0 | V | |
| Common-Mode Rejection Ratio | CMRR | 105 | 130 | dB | |
| Power Supply Rejection Ratio | PSRR | 120 | 140 | dB | |
| Supply Current/Amplifier | ISY | 2.5 | 2.9 | 3.8 | mA |
| Slew Rate | SR | 2.5 | V/µs | ||
| Gain Bandwidth Product | GBP | 10 | MHz | ||
| Voltage Noise (0.1 Hz to 10 Hz) | en p-p | 0.1 | µV p-p | ||
| Voltage Noise Density at 1 kHz | en f = 1 kHz | 2.8 | nV/√Hz |
Key Features
- Ultralow Offset and Drift: The AD8675 features a typical offset voltage of only 10 µV and an offset drift of 0.2 µV/°C, making it highly precise for critical applications.
- Low Input Bias Current: Very low input bias currents and low input current noise ensure minimal signal distortion.
- Rail-to-Rail Output: The amplifier provides a rail-to-rail output swing, maximizing the signal-to-noise ratio (SNR) and dynamic range.
- Low Noise Performance: With a voltage noise of 0.1 µV p-p (0.1 Hz to 10 Hz) and a voltage noise density of 2.8 nV/√Hz at 1 kHz, the AD8675 is ideal for low noise applications.
- Compact Packaging: Available in 8-lead MSOP and 8-lead narrow SOIC packages, both of which are RoHS compliant.
- Extended Temperature Range: Specified for the extended industrial temperature range of −40°C to +125°C.
- Low Power Consumption: The amplifier has a supply current of 2.5 mA to 3.8 mA, making it suitable for power-sensitive applications.
Applications
- Precision Instrumentation: Ideal for precision filter circuits, position and pressure sensors, and other instrumentation requiring high accuracy.
- Medical Instrumentation: Suitable for medical devices where low noise and high precision are critical.
- Strain Gage Amplifiers: The low noise and high precision make it a good fit for strain gage applications.
- PLL and Other Precision Circuits: The AD8675 is beneficial in phase-locked loops (PLL) and other precision circuits due to its low noise and high bandwidth.
Q & A
- What is the typical offset voltage of the AD8675?
The typical offset voltage of the AD8675 is 10 µV.
- What is the offset drift of the AD8675?
The offset drift of the AD8675 is 0.2 µV/°C.
- What are the input bias currents of the AD8675?
The input bias currents of the AD8675 are typically 0.5 nA, with a range of -2 nA to +2 nA.
- Does the AD8675 have rail-to-rail output?
Yes, the AD8675 features a rail-to-rail output swing.
- What is the voltage noise of the AD8675?
The voltage noise of the AD8675 is 0.1 µV p-p (0.1 Hz to 10 Hz).
- In what temperature range is the AD8675 specified?
The AD8675 is specified for the extended industrial temperature range of −40°C to +125°C.
- What are the available packages for the AD8675?
The AD8675 is available in 8-lead MSOP and 8-lead narrow SOIC packages, both of which are RoHS compliant.
- What is the typical supply current of the AD8675?
The typical supply current of the AD8675 is 2.9 mA, with a range of 2.5 mA to 3.8 mA.
- What are some common applications of the AD8675?
The AD8675 is commonly used in precision instrumentation, medical instrumentation, strain gage amplifiers, and PLL circuits.
- Does the AD8675 have a nulling capability for offset adjustment?
Yes, the AD8675 has a proprietary nulling capability that allows for the compensation of device and system offset errors up to 3.5 mV.
