Overview
The AD8572AR, produced by Analog Devices Inc., is a dual-channel, zero-drift, operational amplifier (op amp) known for its high accuracy and low cost. This amplifier features a rail-to-rail input and output swing, making it suitable for a wide range of applications. The AD8572AR operates from a single-supply voltage as low as 2.7 V and up to 5 V, and it is designed to provide ultralow offset, drift, and bias current, which are critical for precise measurements and low distortion in AC signals.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Offset Voltage | VOS | VS = 5 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C | 1 | 5 | μV | |
| Input Bias Current | IB | −40°C ≤ TA ≤ +125°C | 10 | 50 | pA | |
| Common-Mode Rejection Ratio | CMRR | VCM = 0 V to 5 V | 115 | 130 | dB | |
| Large Signal Voltage Gain | AVO | RL = 10 kΩ, VO = 0.3 V to 4.7 V | 110 | 140 | dB | |
| Offset Voltage Drift | ΔVOS/ΔT | −40°C ≤ TA ≤ +125°C | 0.005 | 0.04 | μV/°C | |
| Output Voltage High | VOH | RL = 100 kΩ to GND | 4.99 | 4.998 | V | |
| Supply Current per Amplifier | ISY | VO = 0 V | 750 | 975 | μA | |
| Overload Recovery Time | tOR | 0.05 | 0.3 | ms |
Key Features
- Zero-Drift Technology: Eliminates intermodulation effects and provides high accuracy without the need for external capacitors.
- Low Input Bias Current: Typically 10 pA, ensuring minimal input current errors.
- Rail-to-Rail Input and Output: Allows the input common-mode voltage range to reach both supply rails, enhancing versatility in various applications.
- Low Supply Current: Approximately 750 μA per op amp, making it power-efficient.
- High Common-Mode Rejection Ratio (CMRR): Up to 130 dB, ensuring good rejection of common-mode signals.
- Low Offset Voltage Drift: As low as 0.005 μV/°C, minimizing temperature-induced errors.
Applications
- Temperature Sensors: Ideal for precise temperature measurements due to its low drift and high accuracy.
- Pressure Sensors: Suitable for pressure sensing applications requiring high precision and low noise.
- Precision Current Sensing: Used in applications where accurate current measurement is critical.
- Strain Gage Amplifiers: Enhances the signal quality from strain gages with its high precision and low noise characteristics.
- Medical Instrumentation: Applicable in medical devices where high accuracy and low distortion are essential.
- Thermocouple Amplifiers: Suitable for thermocouple applications due to its ability to handle low-level signals with high precision.
- Automotive Applications: Used in various automotive sensing and measurement applications requiring high precision and reliability.
Q & A
- What is the typical input bias current of the AD8572AR?
The typical input bias current is 10 pA.
- What is the operating voltage range for the AD8572AR?
The AD8572AR operates from a single-supply voltage as low as 2.7 V and up to 5 V.
- What is the common-mode rejection ratio (CMRR) of the AD8572AR?
The CMRR is up to 130 dB.
- Does the AD8572AR require external capacitors?
No, the AD8572AR does not require external capacitors due to its zero-drift technology.
- What is the typical supply current per amplifier for the AD8572AR?
The typical supply current per amplifier is approximately 750 μA.
- What is the overload recovery time of the AD8572AR?
The overload recovery time is between 0.05 ms and 0.3 ms.
- What are some common applications of the AD8572AR?
Common applications include temperature sensors, pressure sensors, precision current sensing, strain gage amplifiers, medical instrumentation, and thermocouple amplifiers.
- What is the offset voltage drift of the AD8572AR?
The offset voltage drift is as low as 0.005 μV/°C.
- What is the output voltage high for the AD8572AR?
The output voltage high is typically between 4.99 V and 4.998 V for a load resistance of 100 kΩ to GND.
- What package options are available for the AD8572AR?
The AD8572AR is available in an 8-SOIC package.
