Overview
The AD8643ARZ-REEL, produced by Analog Devices Inc., is a low power, precision JFET input operational amplifier. It is part of the AD8641/AD8642/AD8643 family, known for its extremely low input bias current and rail-to-rail output. This amplifier is designed to operate in single-supply systems and is suitable for a wide range of applications due to its ability to buffer complementary metal-oxide semiconductor digital-to-analog converters (CMOS DACs), ASICs, and other wide output swing devices. The AD8643ARZ-REEL is fully specified over the extended industrial temperature range of −40°C to +125°C, making it versatile for various environmental conditions.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Input Bias Current | Extremely Low | - |
| 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 |
| Supply Current/Amplifier (ISY) | 195 µA to 250 µA | −40°C < TA < +125°C |
| Slew Rate (SR) | 3 V/µs | - |
| Gain Bandwidth Product (GBP) | 3.5 MHz | - |
| Phase Margin (Øm) | 60 Degrees | - |
| Voltage Noise Density (eN) | 27.5 nV/√Hz | f = 1 kHz |
| Current Noise Density (iN) | 0.5 fA/√Hz | f = 1 kHz |
| Package | 14-Lead Standard Small Outline Package [SOIC_N] | - |
Key Features
- Extremely low input bias current
- Rail-to-rail output
- Low power consumption (195 µA to 250 µA per amplifier)
- High power supply rejection ratio (PSRR) of 90 dB to 107 dB
- Stable operation with capacitive loads of more than 500 pF
- High slew rate of 3 V/µs and gain bandwidth product of 3.5 MHz
- Low voltage noise density of 27.5 nV/√Hz and current noise density of 0.5 fA/√Hz
Applications
- Line- and battery-powered instruments
- Photodiode amplifiers
- Precision current sensing
- Medical instrumentation
- Industrial controls
- Precision filters
- Portable audio
- Automated Test Equipment (ATE) reference level drivers
- Battery management systems
Q & A
- What is the input bias current of the AD8643ARZ-REEL? The input bias current is extremely low, making it suitable for applications requiring minimal input current.
- What is the output voltage range of the AD8643ARZ-REEL? The output voltage can swing nearly rail-to-rail, with VOH of 4.95 V and VOL of 0.05 V at IL = 1 mA.
- What is the power supply rejection ratio (PSRR) of the AD8643ARZ-REEL? The PSRR is between 90 dB and 107 dB for supply voltages from 5 V to 26 V.
- What is the slew rate of the AD8643ARZ-REEL? The slew rate is 3 V/µs.
- What is the gain bandwidth product (GBP) of the AD8643ARZ-REEL? The GBP is 3.5 MHz.
- What are the typical applications of the AD8643ARZ-REEL? Typical applications include line- and battery-powered instruments, photodiode amplifiers, precision current sensing, medical instrumentation, and industrial controls.
- What is the operating temperature range of the AD8643ARZ-REEL? The operating temperature range is −40°C to +125°C.
- What package types are available for the AD8643ARZ-REEL? It is available in a 14-Lead Standard Small Outline Package [SOIC_N].
- How stable is the AD8643ARZ-REEL with capacitive loads? The AD8643ARZ-REEL remains stable with capacitive loads of more than 500 pF.
- What is the noise performance of the AD8643ARZ-REEL? The voltage noise density is 27.5 nV/√Hz, and the current noise density is 0.5 fA/√Hz at 1 kHz.
