Overview
The AD8672AR, 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 designed to offer exceptional performance in various high-precision applications. The AD8672AR is particularly suited for applications requiring high accuracy, low noise, and stability over a wide range of temperatures.
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 | –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 |
| Gain Bandwidth Product (GBP) | 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 |
| Supply Current per Amplifier (ISY) | 3 mA to 3.5 mA | VO = 0 V, –40°C to +125°C |
| 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 | |
| Power Supply Rejection Ratio (PSRR) | 110 dB to 130 dB | VS = ±4 V to ±18 V |
| Operating Temperature | –40°C to +125°C | |
| Package | 8-lead SOIC, 8-lead MSOP |
Key Features
- Very low noise: 2.8 nV/√Hz voltage noise density and 77 nV p-p peak-to-peak noise.
- Low offset voltage: 20 µV to 75 µV.
- Low input bias current: –12 nA to +12 nA.
- High open-loop gain: 120 dB minimum.
- Wide bandwidth: 10 MHz gain bandwidth product.
- Low power consumption: 3 mA typical supply current 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.
- High common-mode rejection ratio (CMRR): 100 dB to 120 dB.
- High power supply rejection ratio (PSRR): 110 dB to 130 dB.
Applications
- High-quality PLL filters.
- Precision filters for GPS and other applications.
- Medical and analytical instrumentation.
- Precision power supply controls.
- Automated Test Equipment (ATE).
- Data acquisition systems.
- Precision controls.
- Professional quality audio systems.
Q & A
- What is the typical voltage noise density of the AD8672AR?
The typical voltage noise density of the AD8672AR is 2.8 nV/√Hz at 1 kHz.
- What is the maximum offset voltage of the AD8672AR?
The maximum offset voltage of the AD8672AR is 75 µV over the temperature range of –40°C to +125°C.
- What is the input bias current range of the AD8672AR?
The input bias current range of the AD8672AR is –12 nA to +12 nA at +25°C to +125°C.
- What is the gain bandwidth product of the AD8672AR?
The gain bandwidth product of the AD8672AR is 10 MHz.
- What is the slew rate of the AD8672AR?
The slew rate of the AD8672AR is 4 V/µs with a load resistance of 2 kΩ.
- What are the typical supply currents for the AD8672AR?
The typical supply current for the AD8672AR is 3 mA to 3.5 mA per amplifier at VO = 0 V and over the temperature range of –40°C to +125°C.
- What are the output voltage ranges for the AD8672AR?
The output voltage high range is +13.2 V to +13.8 V, and the output voltage low range is –13.8 V to –13.2 V with a load resistance of 2 kΩ.
- What is the operating temperature range of the AD8672AR?
The operating temperature range of the AD8672AR is –40°C to +125°C.
- In what packages is the AD8672AR available?
The AD8672AR is available in 8-lead SOIC and 8-lead MSOP packages.
- What are some common applications of the AD8672AR?
Common applications include high-quality PLL filters, precision filters, medical and analytical instrumentation, precision power supply controls, ATE, data acquisition, precision controls, and professional quality audio systems.
