LM139ADG4

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LM139ADG4 belongs to the category of Comparators. It is a dual voltage comparator which uses low power supplies for operation, requiring only 20mA maximum supply current and 3.4mA typical supply current for each package type. The LM139ADG4 is designed to compare voltage differentials between two closely referenced voltage and can be used to compare either a single input to a reference or two separate inputs versus each other. The differential input voltage range can reach up to ±15V, and the common-mode range of operating can reach up to -2.2V to Vcc-2V. The high input currents found in good 2.5V logic chips can be used with an LM139ADG4 just as easily as with a standard amplifier stage.

The LM139ADG4 has two phase inverting and two non-inverting comparator amplifiers on the same chip. Each of the four comparators has its own set of offset voltage, voltage bias and supply current. The operating supply voltage range of LM139ADG4 is from 3.0V to 36V, and the storage temperature range can reach from -65°C to 150°C. The LM139ADG4 is rated for 1-kV static discharge protection. With high-gain, high-accuracy and low quiescent current characteristics, the LM139ADG4 comparator can provide reliable performance even under noisy signal conditions.

LM139ADG4 features high speed operation, providing a propagation delay (from signal-input to signal-output) of less than 10ns for one pair of comparators and less than 15ns for two pairs. It also provides a high impedance, rail-to-rail input structure, with input resistance values in the range of 10KΩ to 20KΩ. Other features of LM139ADG4 include the capability to run on low supply currents, rail-to-rail outputs, allowing full range of output-voltage swings even under output loads, and the ability to switch up to 30mA with a power dissipation of 250mW maximum.

The LM139ADG4 device is typically used in applications such as Robotics, Industrial Control, Motor Control, Automated Test Equipment, Automated Process Control, Biolettronics and more. The comparator has wide applications in designing of digital circuits and systems, such as the generation of PCM (Pulse Code Modulation), DEM (Differential Encoding Modulation) and Continuous Phase Modulation signals which are used in medical systems. Other applications of the LM139ADG4 include event timing control, pulse width monitoring, switch contact debouncing, window comparator, instrumentation, high-efficiency power supplies, power sequencing and switching

The basic working principle of the LM139ADG4 is to compare the potential difference between the two input terminals and to produce a corresponding output voltage. It acts as a transducer that can transform voltage changes into current changes. When the input voltage increases, the output voltage also increases and vice versa. The output voltage is proportional to the difference between the two input voltages. When the two input voltages are equal, there is no voltage difference, thus the output voltage will be zero.

It is important to note that the LM139ADG4 comparator is not a data selector, and should not be used for that purpose. Also, the device is unsuitable for high-side sensing applications, as the common-mode range of its output is limited.

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