LM139DR Integrated Circuits (ICs)

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The LM139DR is a low-power, high-performance quad voltage comparator with two open-collector outputs. It is manufactured by Texas Instruments and is popular for its unique ability to detect subtle voltage differences and monitor current levels. The device is available in two packages, the TO-220 capacitor and the surface mount. This article will discuss its application field, working principle, performance specifications, and advantages.

Application Field:

The LM139DR comparator is often used in low-power applications where precision and low noise levels are required. It can also be employed to detect small voltage differences between two related signals such as reference and input. Other applications include Pulse-width Modulation (PWM) circuit monitoring and Proportional–Integral–Derivative (PID) feedback control circuits. Low-battery monitoring, current limiting, building automation systems, motor control/protection systems, fault filtering and threshold detection, power-supply tracking, and resistance measurement also rely on this device.

Working Principle:

The LM139DR compares two voltages, V₁ and V₂, and produces an output signal depending on their relationship. It has an open-collector output structure, with an output current of 100mA and voltage drops of 150mV. The comparator work in one of three states based on the comparison: Output is Low if (V₁ < V₂), Output is High if (V₁ > V₂), and Output is Z if (V₁ = V₂).

The LM139DR includes four independent bilateral comparators that can be operated independently to compare two different voltage sources. The device can be connected in an isolated configuration such that each comparator can be configured to operate as an active-low or active-high comparator. It has input common-mode voltage range from V_SS to V_DD + 0.1V, input differential voltage range of 0.5V, and an offset voltage range of -0.15V. Additionally, it has tristate outputs which allow a signal to control the comparator’s output.

Performance Specifications:

The LM139DR offers several performance benefits. Its wide input range, small offset voltage, and fast response time are ideal for precision voltage comparison applications. Its maximum output frequency is 25MHz, and the maximum supply voltage is 32V. It has standard tolerances of 2.5mV and 5mV for input and output offset voltage, respectively. The typical propagation delay of the device is 500ns, and its typical enable/disable time is 6ns. Its typical output source/sink current is 30mA and 100mA, respectively.

Advantages:

The LM139DR boasts several advantages over more traditional comparator solutions. Its low-noise operation makes it suitable for demanding monitoring applications. It also has near-zero power consumption when disabled, which allows for extended battery life. The device’s sophisticated design permits easy interfacing and improved accuracy in voltage comparison. Finally, its versatile package options are ideal for both desktop and embedded applications.

The LM139DR is an excellent choice for applications requiring precision voltage comparison. Its low-noise operation, small offset voltage, and fast response time make it highly suitable for current-level monitoring, low-battery monitoring, and threshold detection. Its open-collector output structure and tristate operation allow for easy interfacing and configuration. Additionally, its wide input range and low-power consumption are ideal for battery-powered applications. The LM139DR is an ideal solution for many voltage-comparison needs.

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