LM211QDR

Product Overview

Category: Integrated Circuit (IC)

Use: LM211QDR is a high-speed voltage comparator designed for use in applications requiring fast response times, such as analog-to-digital converters, line receivers, and waveform generators.

Characteristics: - High speed: The LM211QDR offers a fast response time, making it suitable for time-critical applications. - Low input offset voltage: This voltage comparator provides accurate comparisons with minimal error due to its low input offset voltage. - Wide supply voltage range: It operates within a wide supply voltage range, allowing flexibility in various circuit designs. - Rail-to-rail output swing: The LM211QDR offers rail-to-rail output swing, ensuring compatibility with different logic levels. - Low power consumption: It consumes low power, making it energy-efficient.

Package: The LM211QDR comes in a small outline package (SOIC) with 8 pins.

Essence: LM211QDR is an essential component in electronic circuits that require precise voltage comparisons and fast response times.

Packaging/Quantity: The LM211QDR is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 2V to 36V
• Input Offset Voltage: ±1mV
• Response Time: 9ns
• Output Current: 20mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM211QDR has the following pin configuration:

```

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| | --| IN- OUT |-- --| IN+ VCC |-- --| GND NC |-- |___________| ```

Functional Features

• High-speed voltage comparison: The LM211QDR can quickly compare two input voltages and provide a corresponding output.
• Open collector output: The open collector output allows for easy interfacing with other digital circuits.
• Built-in hysteresis: Hysteresis ensures stable operation by preventing rapid switching near the threshold voltage.

Advantages

• Fast response time enables accurate voltage comparisons in time-critical applications.
• Low power consumption makes it suitable for battery-powered devices.
• Wide supply voltage range provides flexibility in various circuit designs.
• Rail-to-rail output swing ensures compatibility with different logic levels.

Disadvantages

• Limited number of pins may restrict its use in complex circuits requiring multiple inputs/outputs.
• Requires external resistors for precise voltage level shifting or scaling.

Working Principles

The LM211QDR compares the voltage at the IN+ pin with the voltage at the IN- pin. If the voltage at IN+ is higher than IN-, the output goes low, indicating a negative comparison. Conversely, if the voltage at IN+ is lower than IN-, the output goes high, indicating a positive comparison. The built-in hysteresis prevents rapid switching near the threshold voltage, ensuring stable operation.

Application Field Plans

The LM211QDR finds applications in various fields, including:

1. Analog-to-Digital Converters (ADCs): It can be used as a comparator in ADCs to convert analog signals into digital data.
2. Line Receivers: The LM211QDR is suitable for line receivers that require fast response times to accurately detect signal levels.
3. Waveform Generators: It can be utilized in waveform generators to generate precise waveforms based on voltage comparisons.

Alternative Models

1. LM311: Similar to LM211QDR, but with an open collector output and wider temperature range.
2. LM339: A quad voltage comparator with four independent comparators in a single package.
3. LM393: Dual voltage comparator with low power consumption and wide supply voltage range.

These alternative models offer similar functionality to the LM211QDR and can be considered based on specific application requirements.

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