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Analog Signal Transmission Over Telephone Lines (TC9400)

2016-02-03 13:40  
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This article describes the Analog Signal Transmission Over Telephone Lines (TC9400). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:TC9400.

Telephone line is designed to carry audio signal, which is an alternating current in nature. To transmit measurement signal, which has very low frequency or DC signal, we have to convert the signal into AC with acceptable frequency range for telephone line transmission.

ANALOG SIGNAL TRANSMISSION OVER TELEPHONE LINES1 circuit schematic

For transmitting analog data over telephone lines, its ideal to use the TC9400′s square-wave output. Since the square wave takes up less frequency spectrum a square wave is actually preferred over a pulse waveform for data transmission. By use of low pass filters, the square wave’s spectrum can be further reduced. The TC9400 converts the frequency signal back into a voltage output linearly proportional to the original input voltage at the end of the telephone line.


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