Overview
The AD8643ARZ, produced by Analog Devices Inc., is a low power, precision JFET input operational amplifier. It is known for its extremely low input bias current and rail-to-rail output, making it suitable for a wide range of applications. This amplifier is part of the AD8641/AD8642/AD8643 family and is characterized by its ability to swing nearly rail-to-rail at both the input and output, which is particularly useful in single-supply systems. The AD8643ARZ is fully specified over the extended industrial temperature range of −40°C to +125°C, ensuring reliability in various environmental conditions.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Offset Voltage | VOS | 70 | 750 | 1.5 | µV |
| Input Bias Current | IB | 0.25 | 1 | 260 | pA |
| Input Offset Current | IOS | 0.5 | 65 | pA | |
| Input Voltage Range | -13 | +10 | V | ||
| Common-Mode Rejection Ratio | CMRR | 90 | 107 | dB | |
| Output Voltage High | VOH | 4.94 | 4.95 | V | |
| Output Voltage Low | VOL | 0.01 | 0.05 | V | |
| Output Current | IOUT | ±6 | mA | ||
| Supply Current/Amplifier | ISY | 195 | 250 | 270 | µA |
| Slew Rate | SR | 2 | V/µs | ||
| Gain Bandwidth Product | GBP | 2.5 | MHz | ||
| Phase Margin | Øm | 50 | Degrees | ||
| Voltage Noise Density | eN | 28.5 | nV/√Hz | ||
| Current Noise Density | iN | 0.5 | fA/√Hz |
Key Features
- Low Input Bias Current: Extremely low input bias current of 0.25 pA to 260 pA, making it ideal for high-precision applications.
- Rail-to-Rail Output: The ability to swing nearly rail-to-rail at the output, ensuring maximum signal range in single-supply systems.
- Low Power Consumption: Supply current per amplifier is typically 250 µA, suitable for battery-powered and low-power applications.
- High Stability with Capacitive Loads: The outputs remain stable with capacitive loads of more than 500 pF.
- Wide Temperature Range: Fully specified over the extended industrial temperature range of −40°C to +125°C.
- Low Noise Performance: Voltage noise density of 28.5 nV/√Hz at 1 kHz and current noise density of 0.5 fA/√Hz at 1 kHz.
Applications
- Line-/Battery-Powered Instruments: Ideal for instruments that require low power consumption.
- Photodiode Amplifiers: Suitable for amplifying signals from photodiodes.
- Precision Current Sensing: Used in applications requiring high accuracy in current measurement.
- Medical Instrumentation: Applicable in medical devices due to its high precision and low noise characteristics.
- Industrial Controls: Used in industrial control systems for precise signal amplification.
- Precision Filters: Suitable for use in precision filter circuits.
- Portable Audio: Can be used in portable audio equipment for high-quality signal amplification.
- ATE Reference Level Drivers: Used in automated test equipment for driving reference levels.
Q & A
- What is the typical input bias current of the AD8643ARZ?
The typical input bias current is 1 pA, with a maximum of 260 pA over the temperature range of −40°C to +125°C.
- What is the output voltage range of the AD8643ARZ?
The output voltage range is nearly rail-to-rail, with VOH typically 4.94 V and VOL typically 0.05 V at a load current of 1 mA.
- What is the gain bandwidth product of the AD8643ARZ?
The gain bandwidth product (GBP) is 2.5 MHz.
- What is the slew rate of the AD8643ARZ?
The slew rate (SR) is 2 V/µs.
- What are the typical applications of the AD8643ARZ?
Typical applications include line-/battery-powered instruments, photodiode amplifiers, precision current sensing, medical instrumentation, and industrial controls.
- What is the temperature range over which the AD8643ARZ is specified?
The AD8643ARZ is fully specified over the extended industrial temperature range of −40°C to +125°C.
- How much current does the AD8643ARZ typically consume?
The supply current per amplifier is typically 250 µA.
- What is the common-mode rejection ratio (CMRR) of the AD8643ARZ?
The CMRR is typically 107 dB.
- Is the AD8643ARZ suitable for use with capacitive loads?
Yes, the outputs remain stable with capacitive loads of more than 500 pF.
- What is the voltage noise density of the AD8643ARZ?
The voltage noise density is 28.5 nV/√Hz at 1 kHz.
