LE7920-2DJCT

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The LE7920-2DJCT is a commercially available integrated circuit (IC) which converts digital logic signals into appropriate amplitudes and frequencies of analog electrical signals. It is commonly used in telecom applications such as telecommunication trunk lines, local switching systems, and global access systems. This IC is also applicable in data communications, internetworking, and high-speed network gateways.

Features

In order to meet requirements for telecom applications, the LE7920-2DJCTs feature an ultra-wideband linearity capability with minimized signal distortion, operation from low power supply voltages, and the capability to function up to frequencies of 25.2 GHz. Furthermore, the maximum current consumption of the IC is 5.5 mA and its maximum output amplitude is 4 bars (5 volts). Additionally, the IC uses various normal row and differential row input pins that are compatible with tunneling and transmission. Moreover, the IC is equipped with numerous timing controls such as start pulse and count pulse to enable smooth operations.

Working Principle

The LE7920-2DJCT is designed to function with two types of signals: non-transitional timing signals and repetitive timing signals. During non-transitional timing signals, the IC takes two clock signals, a start pulse and a count pulse, and counts their rising edges before generating an output signal. For these types of operations, the IC is configured to use a 3-wire system for communication. Repetitive timing signals on the other hand, require only one source of timing signals which are generated by the rising and falling edges of the input signals.The LE7920-2DJCT then processes these signals according to input data and the clock signals to produce amplified output signals. The IC functions by generating a series of output pulses that vary in frequency and amplitude according to the input signals. This process is known as frequency modulation. Some of the pulses generated by the IC are sampled and the output is then fed back to the IC to adjust the pulse amplitude and frequency. This concept forms the basis of feedback control and ensures optimum performance of the IC.

Applications

The LE7920-2DJCT is primarily used in telecom applications, though it is also present in industrial applications such as modems, data acquisition systems, and radio receivers. In telecom applications, the IC is used to provide trunk connections due to its wide range of operation and low power consumption. Furthermore, the IC is employed in local switching systems for the purpose of multiplexing current loop signals, and in global access systems to provide analog signals from processors. Additionally, the IC is able to perform local area network conversions, act as a low-speed digital-analog converter, and provide digital transmission line interface exchange.

Conclusion

The LE7920-2DJCT is a versatile, low-power integrated circuit which is commonly used in Telecom applications. Its features include an ultra-wideband linearity capability, operation from low power supply voltages, and the ability to function up to frequencies of 25.2GHz. The IC utilizes normal row and differential row input pins that are compatible with tunneling and transmission, as well as various timing controls to ensure smooth operations. The LE7920-2DJCT is mainly used in trunk connections, local switching systems, and global access systems, as well as low-speed digital-analog conversion, local area network conversions, and digital transmission line interface exchange.

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