Overview
The AD8574ARZ-REEL, produced by Analog Devices Inc., is a quad operational amplifier that belongs to the AD8571/AD8572/AD8574 family. This amplifier is known for its ultralow offset, drift, and bias current, making it suitable for high-accuracy applications. It utilizes a patented spread-spectrum, auto-zero technique to eliminate intermodulation effects, providing benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. The AD8574 operates from a single supply of 2.7 V to 5 V and features rail-to-rail input and output swings, ensuring high performance across a range of operating conditions.
Key Specifications
| Parameter | Typical Value | Min/Max Value |
|---|---|---|
| Input Offset Voltage | 1 μV | - |
| Input Offset Drift | 0.005 μV/°C | - |
| Input Bias Current | 10 pA | 30 pA to 400 pA (depending on temperature range) |
| Supply Voltage | 2.7 V to 5 V | - |
| Supply Current per Amplifier | 850 μA to 975 μA | 1000 μA to 1075 μA (depending on temperature range) |
| Common-Mode Rejection Ratio (CMRR) | 140 dB | 115 dB to 130 dB (depending on temperature range) |
| Power Supply Rejection Ratio (PSRR) | 130 dB | 115 dB to 130 dB (depending on temperature range) |
| Slew Rate | 0.4 V/μs | - |
| Gain Bandwidth Product | 1.5 MHz | - |
| Output Voltage High | 4.95 V to 4.98 V (RL = 10 kΩ to GND) | - |
| Output Voltage Low | 10 mV to 30 mV (RL = 10 kΩ to V+) | - |
| Operating Temperature | -40°C to +125°C | -55°C to +125°C (for AD8574-EP) |
Key Features
- Ultralow Offset and Drift: The AD8574 features an input offset voltage of 1 μV and an offset drift of 0.005 μV/°C, ensuring high accuracy in applications.
- Rail-to-Rail Input and Output: The amplifier supports rail-to-rail input and output swings, enhancing its versatility in various operating conditions.
- Low Input Bias Current: With a typical input bias current of 10 pA, this amplifier is suitable for precision current sensing and other low-current applications.
- Single Supply Operation: The AD8574 operates from a single supply of 2.7 V to 5 V, making it convenient for a wide range of applications.
- High CMRR and PSRR: The amplifier has a high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR), ensuring robust performance against common-mode and power supply noise.
- No External Capacitors Required: The AD8574 does not require external capacitors, simplifying the design and reducing component count.[
Applications
- Temperature Sensors: The AD8574 is suitable for temperature sensing applications due to its low offset and drift characteristics.
- Pressure Sensors: It is used in pressure sensing applications where high accuracy and low noise are critical.
- Precision Current Sensing: The amplifier’s low input bias current makes it ideal for precision current sensing applications.
- Strain Gage Amplifiers: It is used in strain gage amplifiers where high accuracy and stability are required.
- Medical Instrumentation: The AD8574 is used in medical instrumentation due to its high accuracy and reliability.
- Thermocouple Amplifiers: It is suitable for thermocouple amplifiers where low offset and drift are essential.[
Q & A
- What is the typical input offset voltage of the AD8574?
The typical input offset voltage of the AD8574 is 1 μV.
- What is the input bias current of the AD8574?
The typical input bias current of the AD8574 is 10 pA, with a range of 30 pA to 400 pA depending on the temperature range.
- What is the operating supply voltage range for the AD8574?
The AD8574 operates from a single supply of 2.7 V to 5 V.
- Does the AD8574 require external capacitors?
No, the AD8574 does not require external capacitors.[
- What is the common-mode rejection ratio (CMRR) of the AD8574?
The CMRR of the AD8574 is typically 140 dB, with a range of 115 dB to 130 dB depending on the temperature range.[
- What is the slew rate of the AD8574?
The slew rate of the AD8574 is 0.4 V/μs.[
- What is the gain bandwidth product of the AD8574?
The gain bandwidth product of the AD8574 is 1.5 MHz.[
- What are the typical output voltage ranges for the AD8574?
The typical output voltage high is 4.95 V to 4.98 V (RL = 10 kΩ to GND), and the typical output voltage low is 10 mV to 30 mV (RL = 10 kΩ to V+).[
- What is the operating temperature range for the AD8574?
The operating temperature range for the AD8574 is -40°C to +125°C, and -55°C to +125°C for the AD8574-EP version.[
- In what package is the AD8574 available?
The AD8574 is available in a 14-lead SOIC and TSSOP package.[
