Texas Instruments LMx93/LM2903

Introduction to the LMx93/LM2903 Family

The Texas Instruments LM193, LM293, LM393, and LM2903 are versatile dual differential input voltage comparators designed to operate from a single power supply over a wide range of voltages. These comparators are tailored for various applications, providing reliable performance with open-collector outputs and a common mode input voltage range that includes ground. This guide explores the key features, specifications, and applications of the LMx93/LM2903 family, offering insights into why these comparators are a preferred choice in many electronic designs.

Key Features of the LMx93/LM2903 Family

Versatile Power Supply Range

The LMx93/LM2903 family is designed to operate over a broad range of voltages. These comparators can function from a single power supply, making them suitable for applications where simplicity and efficiency are essential. The devices support a typical single supply voltage range from 3V to 28V, accommodating various power configurations in electronic systems.

Differential Input Voltage Comparators

These comparators feature dual differential input voltage capabilities, allowing them to compare two voltages and provide a digital output indicating the relationship between them. This functionality is crucial in applications requiring precise voltage level detection and comparison.

Open Collector Outputs

The LMx93/LM2903 comparators have open collector outputs, enabling easy interfacing with other digital logic circuits. Open collector outputs allow multiple comparators to share a common pull-up resistor, simplifying the design of complex logic systems and ensuring compatibility with various digital devices.

Fast Response Time

With a typical response time of 1.3µs, the LMx93/LM2903 comparators offer rapid switching performance. This fast response time is essential in applications requiring quick detection and response to voltage changes, such as in zero-crossing detectors, pulse-width modulation (PWM) systems, and over-voltage protection circuits.

Compact Package and Mounting Options

The LMx93/LM2903 family is available in a PDIP (Plastic Dual In-line Package) package, which provides ease of handling and soldering in through-hole mounting applications. The compact dimensions (9.81 x 6.35 x 4.57mm) make these comparators suitable for designs with space constraints.

Specifications

General Attributes

Comparator Type: General Purpose
Number of Channels per Chip: 2
نوع الإخراج: Open Collector
Mounting Type: من خلال ثقب
Package Type: PDIP

Electrical Characteristics

Typical Response Time: 1.3µs
Typical Single Supply Voltage: 3V to 28V
Typical Dual Supply Voltage: ±3V, ±5V, ±9V, ±12V, ±15V
Typical Voltage Gain: 106.02 dB

Physical Dimensions

طول: 9.81mm
عرض: 6.35mm
ارتفاع: 4.57mm

Operating Temperature Range

درجة حرارة التشغيل القصوى: +70°C
الحد الأدنى لدرجة حرارة التشغيل: 0°C

Applications of the LMx93/LM2903 Family

Voltage Level Detection

The LMx93/LM2903 comparators are ideal for voltage level detection in power supply monitoring, battery management systems, and other applications requiring precise voltage thresholds. The differential input capability allows accurate comparison of reference and monitored voltages.

Zero-Crossing Detectors

These comparators are commonly used in zero-crossing detection circuits, which are essential in AC signal processing, phase-locked loops (PLLs), and motor control applications. The fast response time ensures accurate detection of zero-crossing points in AC signals.

Pulse-Width Modulation (PWM) Systems

In PWM systems, the LMx93/LM2903 comparators provide reliable performance for generating precise PWM signals. These comparators can compare the input signal with a reference waveform to produce a modulated output, crucial for motor speed control, LED dimming, and audio modulation.

Over-Voltage Protection Circuits

The open collector outputs and rapid response time make the LMx93/LM2903 comparators suitable for over-voltage protection circuits. These comparators can quickly detect over-voltage conditions and trigger protective actions, safeguarding sensitive electronic components.

خاتمة

The Texas Instruments LMx93/LM2903 family of dual comparators offers a versatile and reliable solution for various electronic applications. With a broad operating voltage range, fast response time, and open collector outputs, these comparators provide essential functionality in voltage level detection, zero-crossing detection, PWM systems, and over-voltage protection. Their compact package and ease of integration make them a preferred choice for engineers and designers seeking efficient and dependable comparator solutions.

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التعليمات

Q1: What is the typical response time of the LMx93/LM2903 comparators?

A1: The typical response time of the LMx93/LM2903 comparators is 1.3µs.

Q2: What types of applications are suitable for the LMx93/LM2903 family?

A2: The LMx93/LM2903 comparators are suitable for voltage level detection, zero-crossing detection, PWM systems, and over-voltage protection circuits.

Q3: What is the operating voltage range for these comparators?

A3: The LMx93/LM2903 comparators support a typical single supply voltage range from 3V to 28V and various dual supply voltages.

Q4: Are the LMx93/LM2903 comparators available in surface-mount packages?

A4: The LMx93/LM2903 family is available in a through-hole PDIP package. Surface-mount options may be available for similar comparator models.

Q5: Can the LMx93/LM2903 comparators operate from a single power supply?

A5: Yes, these comparators are designed to operate from a single power supply, providing flexibility in power configuration.