MT90812AL1

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The MT90812AL1 is an advanced, low-cost physical layer device for telecommunications networks. It integrates several baseband processing functions, including differentiating symbols from a digital data stream, creating an amplitude-modulated (AM) waveform, restoring the transmitted-carrier information, encoding transmit information, buffering the processed transmission data, demodulating AM signals, and decoding received data. It can be used in any type of communications terminal, including consumer electronic devices, industrial networking products, and internet appliances. The device is compliant with the popular communication interface standards, providing a communication interface with up to 2 Mbps transfer rate.

The key features of MT90812AL1 based on the application field and its working principle include:

Interface

• USB 2.0 interface with a data rate of up to 2 Mbps.
• Integrated USB PHY, Controller, and multiple protocols.
• Support for multiple communication protocols, including USB, RS-232, Ethernet, and Wi-Fi.

Data Transfer

• Multiple frequency modulation and data transmission modes.
• Adaptive equalizer to combat noise.
• Receiver sensitivity of -68dBm.

Miscellaneous

• Automatic gain control and timing control.
• Elimination of harmonics generated by the transmitted signal.
• Low power operation and high reliability.

The initialization of the device is done by a host processor or controller. After successful communication has been established, MT90812AL1 is connected with the interface. The data to be transmitted is encoded, modulated, and sent out on the transmission line. At the receiver, the incoming data is demodulated, decoded and compared to the transmitted data. The difference between the transmitted and received data is then used to determine the quality of the link.

At the transmitter, the device’s transmitter section contains an encoder for converting data into a suitable format for data transmission. It also includes a RAM for buffering the transmitted data. Finally, an amplitude modulator is used to create an amplitude-modulated waveform from the input digital data stream. The transmitter records the data errors and tries to minimize them by using the automatic gain control feature of the device.

At the receiver, the demodulator uses the amplitude-modulated waveform and the received carrier information to recover the transmitted data. The received data is then decoded and stored in the RAM utilizing the built-in decoder. Finally, the processor compares the received data with the transmitted data and calculates the quality of the transmission link.

When connected with the host processor, MT90812AL1 is capable of transmitting and receiving data to and from the other device. The device’s multiple protocols support different types of repeaters and serial connections. Because of the device’s low power operation, high reliability, excellent receiver sensitivity, and wide variety of communication protocols, MT90812AL1 is an ideal choice for telecommunications applications.

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