DS2180A+

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The DS2180A+ is an IC (Integrated Circuit) that is utilized in equipment requiring data communications over telephone lines. It belongs to a line of analog modem products from Maxim Integrated Products and features a high performance receive and transmit data rate of up to 33.6 kbits/s with ITU V.90-98 K56flex performance. The DS2180A+ also supports MNP®/V.42 error correction protocols, as well as V.42/V.42bis/MNP5 data compression protocols, making it suitable for applications including but not limited to such as credit card authorization, catalog shopping, file transfers and remote control.

In essence, the DS2180A+ is designed to be driven by a microcontroller—an IC or a system-on-a-chip that acts as the brains of a computer. This microcontroller is usually connected to the modem with a UART (Universal Asynchronous Receiver/Transmitter) interface. The modem would then be connected to the telephone line. The UART communicates with the microcontroller and controls the modem. To communicate over the telephone line with another modem, the microcontroller can send commands to the modem to establish and control a data connection.

In order to transmit and receive signals over the telephone line, the DS2180A+ employs a technique known as frequency shift keying (FSK). In FSK, the spatial arrangement of a signal\'s continuous frequency spectrum is used to encode binary information. The receiver must be able to detect and recognize the FSK patterns in order to correctly decode the transmitted message. The DS2180A+ uses two tones: a high frequency Tone A and a low frequency Tone B. For example, a binary ‘1’ is transmitted by sending the high frequency tone and a binary ‘0’ is sent by sending the low frequency tone.

The DS2180A+ also can detect and respond to certain "answer tones" from the remote modem. This is known as modem negotiation, and is used to exchange information and determine the optimal data rate and the type of encoding used. Once the negotiation process is complete and the modems have agreed on the required settings, the data transfer can begin. The transceiver within the DS2180A+ is used to amplify and demodulate the received data, and then convolute it into serial data for communication to the microcontroller. The controller can then take the necessary action based on the data received.

In addition to data modem support, other functions of the DS2180A+ include call progress detection, voice telephony support, acoustic and electrical echo cancellation and Audio-FAX support. The device also integrates a power down mode, advanced speakerphone circuitry and a complementary input/output port. It is manufactured in either a 44-pin LQFP or a 48-pin EBQFP package.

In conclusion, the DS2180A+ is a robust, high performance modem IC that is optimized for use in data, fax and voice applications. It provides high speed data communications with error correction and compression features, and is suitable for a wide range of telephone based applications.

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