LM239ADE4

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Overview

LM239AD/E4 is an integrated comparator in Linear’s family of CMOS and TTL compatible Logic products. It integrates two comparators with a common output stage thus giving dual comparator functionalities. It has three operating power modes- Normal, Low (1/3), High (3X) and Ultra (5X) High. It is available in commercial temperature range as well as in industrial temperature range and is also available in single as well as in dual versions.

Application field

The LM239AD/E4 is typically used in applications where:

• High level current output is required
• High speed and high accuracy is required
• Low power consumption is needed
• Debouncing and synchronization are required
• Match detectors and stream converters are needed for frequency detection
• Level shifters are required for voltage conversions

The LM239AD/E4 is widely used in a wide range of applications including:

• Radio, television and telephone call transmitters
• Medical equipment
• Appliances
• Security systems
• Industrial automation
• Switching regulators
• Microphone level detectors
• Motor control systems
• Automatic test equipment
• Photoelectric control systems

Working principle

The LM239AD/E4 has two independent comparators, A and B, which share the same common output stage. Comparator A is used to compare an input with a reference voltage and when it detects an input voltage higher or lower than the reference voltage it will set the output state high or low. Comparator B is used to compare an input with a different reference voltage and will set the output state high or low depending on the voltage ratio. Both comparison stages can be operated in power modes, Normal, Low (1/3), and High (3X) up to Maximum Power. Ultra High Power mode is available when operated at 5X power level.

The LM239AD/E4 can be operated in two different modes, either in comparator or as a differential amplifier for greater accuracy. When operated in differential amplifier mode, a second reference voltage is applied across the two comparator inputs to effectively increase the sensitivity of the comparator to the input signal.

The LM239AD/E4 is protected from errors caused by high voltage transients and current surges by the two built-in protection diodes. It also includes an open-drain output which allows for pull-up resistors to be connected externally in order to reduce power dissipation.

Conclusion

The LM239AD/E4 is an integrated comparator designed with Linear’s family of CMOS and TTL compatible Logic products. It integrates two independent comparators with a common output stage which gives dual comparator functionalities. It is widely used in a variety of applications including radio, television and telephone call transmitters, medical equipment, appliances, security systems, industrial automation, switching regulators and photoelectric control systems. It is also protected from errors caused by high voltage transients and current surges by two built-in protection diodes and includes an open-drain output for external pull-up resistors.

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