Overview
The AD8641AKSZ-R2 is a low power, precision JFET input operational amplifier produced by Analog Devices Inc. This amplifier is part of the AD8641/AD8642/AD8643 family, 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 AD8641AKSZ-R2 is particularly useful in systems that require low power consumption and high precision, such as line-/battery-powered instruments, photodiode amplifiers, and medical instrumentation.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Current (ISY) | 195 μA to 250 μA | −40°C to +125°C |
| Input Bias Current | 1 pA max | |
| Offset Voltage (VOS) | 750 μV max | |
| Offset Voltage Drift (∆VOS/∆T) | 2.5 µV/°C | −40°C < TA < +125°C |
| Output Voltage High (VOH) | 4.95 V @ IL = 1 mA | −40°C to +125°C |
| Output Voltage Low (VOL) | 0.05 V @ IL = 1 mA | −40°C to +125°C |
| Output Current (IOUT) | ±6 mA | |
| Power Supply Rejection Ratio (PSRR) | 90 dB to 107 dB | VS = 5 V to 26 V or ±2.5 V to ±13 V |
| Slew Rate (SR) | 2 V/μs to 3 V/μs | |
| Gain Bandwidth Product (GBP) | 3 MHz (AD8641/AD8642), 2.5 MHz (AD8643) | |
| Phase Margin (Øm) | 50 Degrees to 60 Degrees | |
| Voltage Noise (eN) | 4.0 μV p-p @ f = 0.1 Hz to 10 Hz | |
| Voltage Noise Density (eN) | 27.5 nV/√Hz @ f = 1 kHz | |
| Current Noise Density (iN) | 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
- Automated Test Equipment (ATE)
- Battery management
Q & A
- What is the input bias current of the AD8641AKSZ-R2?
The input bias current is 1 pA max. - What is the supply current range for the AD8641AKSZ-R2?
The supply current ranges from 195 μA to 250 μA. - What are the operating voltage ranges for the AD8641AKSZ-R2?
The AD8641AKSZ-R2 can operate in single-supply configurations from 5 V to 26 V and in dual-supply configurations from ±2.5 V to ±13 V. - Is the AD8641AKSZ-R2 stable with capacitive loads?
Yes, it is stable with capacitive loads of more than 500 pF. - What is the gain bandwidth product (GBP) of the AD8641/AD8642/AD8643?
The GBP is 3 MHz for AD8641/AD8642 and 2.5 MHz for AD8643. - What are some common applications of the AD8641AKSZ-R2?
Common applications include line-/battery-powered instruments, photodiode amplifiers, precision current sensing, medical instrumentation, and industrial controls. - What is the temperature range for the AD8641AKSZ-R2?
The AD8641AKSZ-R2 is fully specified over the extended industrial temperature range of −40°C to +125°C. - Does the AD8641AKSZ-R2 have rail-to-rail output?
Yes, it features rail-to-rail output. - What is the slew rate of the AD8641AKSZ-R2?
The slew rate is 2 V/μs to 3 V/μs. - Is the AD8641AKSZ-R2 unity-gain stable?
Yes, it is unity-gain stable.
