Overview
The AD8642ARZ, produced by Analog Devices Inc., is a low-power, precision JFET input operational amplifier. This device is part of the AD8641/AD8642/AD8643 family and is known for its extremely low input bias current and rail-to-rail output. It is designed to operate in both single-supply and dual-supply configurations, making it versatile for various applications. The AD8642ARZ is particularly useful in systems requiring low power consumption and high precision, such as in medical instrumentation, industrial controls, and precision current sensing.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage | 5 V to 26 V (Single Supply), ±2.5 V to ±13 V (Dual Supply) | - |
| Input Bias Current | 1 pA max | - |
| Offset Voltage | 750 μV max | - |
| Output Voltage High | 4.95 V (Single Supply), +12.95 V (Dual Supply) | IL = 1 mA, -40°C to +125°C |
| Output Voltage Low | 0.05 V (Single Supply), -12.95 V (Dual Supply) | IL = 1 mA, -40°C to +125°C |
| Output Current | ±6 mA (Single Supply), ±12 mA (Dual Supply) | - |
| Supply Current/Amplifier | 195 μA to 250 μA (Single Supply), 200 μA to 290 μA (Dual Supply) | -40°C to +125°C |
| Slew Rate | 2 V/μs to 3 V/μs | - |
| Gain Bandwidth Product | 3 MHz (AD8641, AD8642), 2.5 MHz (AD8643) | - |
| Phase Margin | 50 Degrees to 60 Degrees | - |
| Voltage Noise Density | 27.5 nV/√Hz | f = 1 kHz |
| Current Noise Density | 0.5 fA/√Hz | f = 1 kHz |
Key Features
- Low supply current: 250 μA max
- Very low input bias current: 1 pA max
- Low offset voltage: 750 μV max
- Single-supply operation: 5 V to 26 V, Dual-supply operation: ±2.5 V to ±13 V
- Rail-to-rail output
- Unity-gain stable
- No phase reversal
- Stable with capacitive loads of more than 500 pF
- Extended industrial temperature range: -40°C to +125°C
Applications
- Line-/battery-powered instruments
- Photodiode amplifiers
- Precision current sensing
- Medical instrumentation
- Industrial controls
- Precision filters
- Portable audio
- ATE reference level drivers
- Battery management
Q & A
- What is the input bias current of the AD8642ARZ?
The input bias current of the AD8642ARZ is 1 pA max. - What are the supply voltage ranges for the AD8642ARZ?
The AD8642ARZ can operate in single-supply mode from 5 V to 26 V and in dual-supply mode from ±2.5 V to ±13 V. - What is the maximum output current of the AD8642ARZ?
The maximum output current is ±6 mA for single-supply and ±12 mA for dual-supply configurations. - Is the AD8642ARZ stable with capacitive loads?
Yes, the AD8642ARZ is stable with capacitive loads of more than 500 pF. - What is the gain bandwidth product of the AD8642?
The gain bandwidth product for the AD8642 is 3 MHz. - What are some typical applications of the AD8642ARZ?
Typical applications include line-/battery-powered instruments, photodiode amplifiers, precision current sensing, medical instrumentation, and industrial controls. - What is the temperature range for the AD8642ARZ?
The AD8642ARZ is fully specified over the extended industrial temperature range of -40°C to +125°C. - Does the AD8642ARZ have rail-to-rail output capability?
Yes, the AD8642ARZ has rail-to-rail output capability. - What is the slew rate of the AD8642ARZ?
The slew rate of the AD8642ARZ is 2 V/μs to 3 V/μs. - What is the voltage noise density of the AD8642ARZ?
The voltage noise density is 27.5 nV/√Hz at f = 1 kHz.
