LM211QDG4

Product Overview

Category: Integrated Circuits (ICs)

Use: LM211QDG4 is a high-speed voltage comparator designed for use in applications requiring fast response times, such as precision instrumentation, computer peripherals, and control systems.

Characteristics: - High speed: The LM211QDG4 offers a fast response time, making it suitable for time-critical applications. - Wide input voltage range: It can operate with input voltages ranging from -15V to +15V, providing flexibility in various circuit designs. - Low input offset voltage: The device exhibits low input offset voltage, ensuring accurate and precise comparisons. - Low output saturation voltage: With a low output saturation voltage, the LM211QDG4 minimizes power dissipation and enhances overall efficiency.

Package: The LM211QDG4 is available in a small outline package (SOIC) with 8 pins. This compact package allows for easy integration into circuit boards and reduces space requirements.

Essence: The essence of LM211QDG4 lies in its ability to quickly compare two input voltages and provide a digital output indicating which voltage is higher.

Packaging/Quantity: The LM211QDG4 is typically sold in reels containing 2500 units per reel.

Specifications

• Supply Voltage Range: ±2V to ±18V
• Input Offset Voltage: 2mV (maximum)
• Response Time: 9ns (typical)
• Output Current: 20mA (maximum)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM211QDG4 features the following pin configuration:

```

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| | --| IN(-) 1|-- VCC+ --| IN(+) 2|-- OUT --| GND 3|-- NC --| NC 4|-- IN(-) --| OUT 5|-- IN(+) --| VCC- 6|-- GND |__________| ```

Functional Features

1. High-Speed Operation: The LM211QDG4 offers a fast response time of 9ns, enabling quick and accurate voltage comparisons.
2. Wide Input Voltage Range: It can handle input voltages ranging from -15V to +15V, making it suitable for a wide range of applications.
3. Open Collector Output: The device features an open collector output, allowing for easy interfacing with other digital circuits.
4. Built-in Hysteresis: The LM211QDG4 incorporates hysteresis in its design, reducing the likelihood of output oscillation when input voltages are close.

Advantages and Disadvantages

Advantages: - High-speed operation enables time-critical applications. - Wide input voltage range provides flexibility in circuit design. - Low input offset voltage ensures accurate comparisons. - Open collector output simplifies interfacing with other circuits. - Built-in hysteresis reduces output oscillation.

Disadvantages: - Limited output current capability (20mA maximum). - Requires external pull-up resistor for proper operation.

Working Principles

The LM211QDG4 operates based on the principle of comparing two input voltages. When the voltage at the non-inverting input (IN(+)) is higher than the voltage at the inverting input (IN(-)), the output (OUT) goes low. Conversely, when the voltage at IN(-) is higher than IN(+), the output goes high. This behavior allows the LM211QDG4 to function as a digital comparator.

Detailed Application Field Plans

The LM211QDG4 finds application in various fields, including: 1. Precision Instrumentation: The high-speed operation and accurate voltage comparisons make it suitable for precision measurement devices. 2. Computer Peripherals: It can be used in computer interfaces, such as USB hubs or data acquisition systems, to compare voltages and trigger specific actions. 3. Control Systems: The LM211QDG4 is commonly employed in control systems to monitor and compare sensor voltages, enabling precise control actions.

Detailed and Complete Alternative Models

1. LM311: Similar to the LM211QDG4, the LM311 is a voltage comparator with comparable specifications and features.
2. LM339: The LM339 is a quad voltage comparator, offering four independent comparators in a single package.
3. LM393: This dual voltage comparator provides two independent comparators in a compact package.

These alternative models offer similar functionality and can be considered as substitutes for the LM211QDG4 depending on specific requirements.

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