HHM1518A3 RF/IF and RFID

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Balun

A balun (a portmanteau of the words balanced and unbalanced) is an electrical device that converts between balanced and unbalanced electrical signals. It is used to increase the balance of a signal path, as well as to reduce signal reflections, impacts on voltage level, crosstalk, and other kinds of electromagnetic interference. It is also useful in providing isolation, when converting between transmission line formats, such as coaxial and twisted pair. Baluns are commonly used in telecommunications and other applications.

HHM1518A3 Application Field and Working Principle

The HHM1518A3 is a low power, high performance, microprocessor-based, bus-powered differential balun device. It converts a differential signal in the range of 500 mVpp to 5 Vpp into a unidirectional signal by using a switching topology. Its output is typically rated to support frequencies from 10 kHz up to 20 MHz. Its features ensure low harmonic distortion, low power consumption, and excellent performance over a wide temperature range.

The HHM1518A3 is designed to support communication systems involving industrial ethernet, Profibus, AS-Interface, and audio signals, making it applicable not only to communication systems but also to automotive, industrial, consumer, and other market segments. Moreover, the HHM1518A3 features digital interfacing so it can be programmed to suit the needs of the specific application.

The HHM1518A3 features bus-powered operation and can be used in both copper and fiber transmission lines. Furthermore, it contains a low-noise power-supply regulator and two bridges to convert the differential signal into a unidirectional signal. The bridges are also designed to protect against over-voltage.

The operation of the balun is based on an oscillator. It is designed to function in two phases: when the bridge is switched, the balun will pass the differential signal as a unidirectional signal. In the off state, there is no voltage at the output. On the control line, a logic low level turns the balun on, and a logic high level turns it off. The linearity and accuracy of the conversion process depend on the size of the power supply voltage.

The HHM1518A3 balun finds its main applications in telecom, car audio, instrumentation, portable electronics, and other applications requiring precise linearity and pinpoint accuracy. Its high performance and low power consumption enable it to be used in a range of environments, with the added benefit of low power consumption. It is supplied in a small, compact package that is able to fit into tight spaces, making it versatile and highly efficient in a range of applications.

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