LM139AJ/PB Integrated Circuits (ICs)

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LM139AJ/PB Application Field and Working Principle

LM139AJ/PB are generic low-power, general purpose quad comparators with an operating voltage range of ±2V to ±36V. They are specifically designed to form a high-speed TTL/DTL logic compatible 9-channel analog multiplexer/demultiplexer, reference source and wide-swing current source with guaranteed minimum characteristics.

Introduction

LM139AJ/PB is a high-precision analog multiplexer/demultiplexer, reference source, and wide-swing current source based on quad comparators. It is a 4-bit SRAM cell with a single 4-state buffer. It has a voltage range of ±2V to ±36V, and is designed for low power, general purpose applications. It also has a guaranteed minimum performance, as well as upper and lower levels of operation. Furthermore, it is also TTL/DTL logic compatible.

Application

LM139AJ/PB are most commonly used for analog multiplexer/demultiplexer and wide-swing current source applications. Since it is a low power, general purpose quad comparator, it is typically used in microprocessor systems, analog instrumentation, audio and video switching, analog-to-digital converters (ADC) and voltage reference circuits. It is also commonly used in applications that require a low-offset, high-accuracy reference source. Additionally, since it is TTL/DTL logic compatible, it is often found in logic circuits, counter circuits and voltage reference sources.

Working Principle

The basic function of a comparator is to compare two voltage levels. LM139AJ/PB use differential inputs to compare two voltage levels. When the input voltage difference increases, the output is either low or high depending on the polarity of the inputs. This comparison is done by the way of an internal reference voltage. The comparison is then used to change the current flow of the output.

LM139AJ/PB also come with active-low and active-high reset logic outputs, which allow the device to reset itself after a comparison cycle. This reset logic can be set to either a logical high or low based on the user\'s application requirements. Additionally, LM139AJ/PB come with thermal shutdown and current limiting protection, which keep the device from operating if the temperature exceeds a certain point or if the current draw is too high.

Conclusion

The LM139AJ/PB application field and working principle consists of a quad comparator, which is low in power and designed for general purpose applications. It is most commonly used for analog multiplexer/demultiplexer, reference source and wide-swing current source applications. In order to compare two voltage levels, it utilizes an internal reference voltage and then uses the differential input to change the current flow of its output. Furthermore, it is TTL/DTL logic compatible, and it also comes with reset logic output, thermal shutdown and current limiting protection.

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