Overview
The AD8672, 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 family, which is designed for applications requiring high accuracy and stability. The AD8672 is suitable for a wide range of applications, including high-quality PLL filters, precision filters, medical and analytical instrumentation, and professional quality audio systems.
Key Specifications
| Parameter | Typical Value | Maximum Value |
|---|---|---|
| Offset Voltage (VOS) | 20 µV | 75 µV |
| Offset Voltage Drift (∆VOS/∆T) | 0.3 µV/°C | 0.8 µV/°C |
| Input Bias Current (IB) | 12 nA | 40 nA |
| Input Offset Current (IOS) | 6 nA | 40 nA |
| Input Voltage Range | -2.5 V to +2.5 V | |
| Common-Mode Rejection Ratio (CMRR) | 110 dB to 130 dB | |
| Supply Current per Amplifier (ISY) | 3 mA | 4.2 mA |
| Slew Rate (SR) | 4 V/µs | |
| Gain Bandwidth Product (GBP) | 10 MHz | |
| Voltage Noise Density (en) | 2.8 nV/√Hz | 3.8 nV/√Hz |
| Current Noise Density (in) | 0.3 pA/√Hz | |
| Output Voltage High (VOH) | +13.2 V to +13.8 V | |
| Output Voltage Low (VOL) | -13.8 V to -13.2 V | |
| Output Current (IOUT) | ±20 mA | |
| Short Circuit Current (ISC) | ±30 mA |
Key Features
- Very low noise: 2.8 nV/√Hz at 1 kHz and 77 nV p-p from 0.1 Hz to 10 Hz.
- Low offset voltage: 75 µV maximum.
- Low input bias current: 12 nA maximum.
- High open-loop gain: 120 dB minimum.
- Low power consumption: 3 mA typical per amplifier.
- Dual-supply operation: ±5 V to ±15 V.
- Unity-gain stable with no phase reversal.
- Stable with capacitive loads of over 1000 pF.
Applications
- High-quality PLL filters.
- Precision filters.
- Medical and analytical instrumentation.
- Sensors and controls.
- Professional quality audio systems.
- GPS instrumentation.
Q & A
- What is the typical offset voltage of the AD8672?
The typical offset voltage of the AD8672 is 20 µV, with a maximum of 75 µV.
- What is the input bias current of the AD8672?
The input bias current of the AD8672 is 12 nA maximum.
- What is the gain bandwidth product of the AD8672?
The gain bandwidth product of the AD8672 is 10 MHz.
- What is the slew rate of the AD8672?
The slew rate of the AD8672 is 4 V/µs.
- What is the supply current per amplifier for the AD8672?
The supply current per amplifier for the AD8672 is typically 3 mA, with a maximum of 4.2 mA.
- What are the typical applications of the AD8672?
The AD8672 is typically used in high-quality PLL filters, precision filters, medical and analytical instrumentation, sensors and controls, and professional quality audio systems.
- What is the voltage noise density of the AD8672?
The voltage noise density of the AD8672 is 2.8 nV/√Hz at 1 kHz, with a maximum of 3.8 nV/√Hz.
- Is the AD8672 stable with capacitive loads?
Yes, the AD8672 is stable with capacitive loads of over 1000 pF.
- What is the output current capability of the AD8672?
The AD8672 can deliver an output current of ±20 mA.
- What is the operating temperature range of the AD8672?
The operating temperature range of the AD8672 is from -40°C to +125°C.
