Overview
The AD8672AR-REEL, produced by Analog Devices Inc., is a high-precision operational amplifier known for its very low noise, low offset voltage, and low input bias current. This amplifier is part of the AD8671/AD8672/AD8674 series, which are renowned for their ultralow noise, high precision, speed, and stability. The AD8672 is particularly suited for applications requiring high accuracy and low noise, such as high-quality PLL filters, precision filters, medical and analytical instrumentation, and professional quality audio.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Offset Voltage (VOS) | 20 µV to 75 µV | –40°C to +125°C |
| Offset Voltage Drift (∆VOS/∆T) | 0.3 µV/°C to 0.5 µV/°C (AD8672) | –40°C to +125°C |
| Input Bias Current (IB) | –12 nA to +12 nA | +25°C to +125°C |
| Input Offset Current (IOS) | –12 nA to +12 nA | +25°C to +125°C |
| Input Voltage Range | –2.5 V to +2.5 V | |
| Common-Mode Rejection Ratio (CMRR) | 100 dB to 120 dB | VCM = –2.5 V to +2.5 V |
| Bandwidth | 10 MHz | |
| Slew Rate (SR) | 4 V/µs | RL = 2 kΩ |
| Settling Time (tS) to 0.1% | 1.4 µs | 4 V step, G = 1 |
| Gain Bandwidth Product (GBP) | 10 MHz | |
| Voltage Noise Density (en) | 2.8 nV/√Hz to 3.8 nV/√Hz | f = 1 kHz |
| Peak-to-Peak Noise (en p-p) | 77 nV p-p to 100 nV p-p | 0.1 Hz to 10 Hz |
| Supply Current/Amplifier (ISY) | 3 mA to 3.5 mA | VO = 0 V, –40°C to +125°C |
| Power Supply Rejection Ratio (PSRR) | 110 dB to 130 dB | VS = ±4 V to ±18 V |
| Output Voltage High (VOH) | +13.2 V to +13.8 V | RL = 2 kΩ, –40°C to +125°C |
| Output Voltage Low (VOL) | –13.8 V to –13.2 V | RL = 2 kΩ, –40°C to +125°C |
| Output Current (IOUT) | ±20 mA |
Key Features
- Very Low Noise: 2.8 nV/√Hz to 3.8 nV/√Hz at 1 kHz, and 77 nV p-p to 100 nV p-p from 0.1 Hz to 10 Hz.
- Low Offset Voltage and Drift: Maximum offset voltage of 75 µV and drift of 0.3 µV/°C to 0.5 µV/°C.
- Low Input Bias Current: Maximum input bias current of 12 nA.
- High Bandwidth: 10 MHz bandwidth.
- Low Power Consumption: Supply current less than 3 mA per amplifier at 30 V.
- Dual-Supply Operation: Operates from ±5 V to ±15 V.
- Unity-Gain Stable: No phase reversal.
- Stable with Capacitive Loads: Outputs are stable with capacitive loads of over 1000 pF.
Applications
- PLL Filters: High-quality phase-locked loop filters.
- Precision Filters: Filters for GPS and other precision applications.
- Medical and Analytical Instrumentation: High-precision medical and analytical instruments.
- Precision Power Supply Controls: Precision control in power supply systems.
- ATE (Automatic Test Equipment): Automated testing equipment.
- Data Acquisition: High-precision data acquisition systems.
- Precision Controls: Various precision control applications.
- Professional Quality Audio: High-fidelity audio systems.
Q & A
- What is the typical supply current per amplifier for the AD8672?
The typical supply current per amplifier is less than 3 mA at 30 V.
- What is the maximum offset voltage for the AD8672?
The maximum offset voltage is 75 µV.
- What is the bandwidth of the AD8672?
The bandwidth is 10 MHz.
- What is the slew rate of the AD8672?
The slew rate is 4 V/µs.
- What are the typical applications of the AD8672?
Typical applications include high-quality PLL filters, precision filters, medical and analytical instrumentation, precision power supply controls, ATE, data acquisition, and professional quality audio.
- What is the operating temperature range for the AD8672?
The operating temperature range is –40°C to +125°C.
- What are the available package options for the AD8672?
The AD8672 is available in 8-lead SOIC and 8-lead MSOP packages.
- What is the power supply rejection ratio (PSRR) for the AD8672?
The PSRR is 110 dB to 130 dB for VS = ±4 V to ±18 V.
- How stable is the output with capacitive loads?
The outputs are stable with capacitive loads of over 1000 pF.
- What is the maximum output current of the AD8672?
The maximum output current is ±20 mA.
