Overview
The AD8675 precision operational amplifier, produced by Analog Devices Inc., is renowned for its ultralow offset, drift, and voltage noise. It combines very low input bias currents with a rail-to-rail output, making it ideal for applications requiring high precision and low noise. The AD8675 offers a wide bandwidth and low power consumption, similar to the industry-standard OP07 amplifier, but with enhanced performance characteristics such as lower voltage noise and input bias current. This amplifier is particularly suited for applications where large error sources cannot be tolerated, such as precision instrumentation, medical instrumentation, and strain gage amplifiers.
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: Typical offset voltage of 10 µV and offset drift of 0.2 µV/°C.
- Low Noise: Voltage noise of 0.1 µV p-p (0.1 Hz to 10 Hz) and voltage noise density of 2.8 nV/√Hz at 1 kHz.
- Low Input Bias Current: Very low input bias current and input current noise.
- Rail-to-Rail Output: Full rail-to-rail output swing.
- High Precision: Proprietary nulling capability to compensate for device and system offset errors up to 3.5 mV.
- Low Power Consumption: Supply current of 2.5 mA to 3.8 mA per amplifier.
- Wide Bandwidth: Slew rate of 2.5 V/µs and gain bandwidth product of 10 MHz.
- Compact Packaging: Available in 8-lead MSOP and 8-lead SOIC packages, RoHS compliant.
- Extended Temperature Range: Specified for the extended industrial temperature range of −40°C to +125°C.
Applications
- Precision Instrumentation: Ideal for applications requiring high precision and low noise.
- Medical Instrumentation: Suitable for medical devices that demand low noise and high accuracy.
- Strain Gage Amplifiers: Used in strain gage applications due to its low noise and high precision.
- Position and Pressure Sensors: Benefits from its low input bias current and wide bandwidth.
- PLL and Precision Filter Circuits: Enhances performance in phase-locked loops and precision filter circuits.
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 voltage drift of the AD8675?
The offset voltage drift of the AD8675 is 0.2 µV/°C.
- What is the input bias current of the AD8675?
The input bias current of the AD8675 is typically 0.5 nA.
- Does the AD8675 have rail-to-rail output?
Yes, the AD8675 features a full rail-to-rail output swing.
- What is the voltage noise density of the AD8675 at 1 kHz?
The voltage noise density of the AD8675 at 1 kHz is 2.8 nV/√Hz.
- What are the typical supply currents for the AD8675?
The typical supply current for the AD8675 is 2.5 mA to 2.9 mA per amplifier.
- What is the slew rate of the AD8675?
The slew rate of the AD8675 is 2.5 V/µs.
- 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 SOIC packages, both of which are RoHS compliant.
- What applications benefit from the AD8675's features?
The AD8675 is beneficial for precision instrumentation, medical instrumentation, strain gage amplifiers, position and pressure sensors, and PLL and precision filter circuits.
