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73K324L-IGT Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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73K324L-IGT Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers |
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2 / 31 page  73K324L CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem 2 DESCRIPTION (continued) The 73K324L offers full hardware and software compatibility with other products in TDK Semiconductor's K-Series family of single-chip modems, allowing system upgrades with a single component change. The 73K324L is ideal for use in free-standing or integral system modem products where full-duplex 2400 bit/s operation with Alternate mode capability is required. Its high functionality, low power consumption, and efficient packaging simplify design requirements and increase system reliability. A complete modem requires only the addition of the phone line interface, a control microprocessor, and RS-232 level converters for a typical system. The 73K324L is designed to provide a complete V.22bis, V.22, Bell 212A, V.21, and V.23 compatible modem on a chip. Many functions were included to simplify implementation in typical modem designs. In addition to the basic 2400 bit/s QAM, 1200/600 bit/s DPSK and 1200/300/75 bit/s FSK modulator/demodulator sections, the device also includes synch/asynch buffering, DTMF, answer, soft carrier, guard, and calling tone generator capabilities. Handshake pattern detectors simplify control of connect sequences, and precise tone detectors allow accurate detection of call progress, answer, calling, and soft carrier turn off tones. All Operating modes defined by the incorporated standards are included, and Test modes are provided. Most functions are selectable as options, and logical defaults are provided. The device can be directly interfaced to a microprocessor via its 8-bit multiplexed address/data bus for control and status monitoring. Data communications takes place through a separate serial port. Data may also be sent and received through the control registers. This simplifies designs requiring speed buffering, error control and compression. FUNCTIONAL DESCRIPTION QAM MODULATOR/DEMODULATOR The 73K324L encodes incoming data into quad-bits represented by 16 possible signal points with specific phase and amplitude levels. The baseband signal is then filtered to reduce intersymbol interference on the bandlimited telephone network. The modulator transmits this encoded data using either a 1200 Hz (Originate mode) or 2400 Hz (Answer mode) carrier. The demodulator, although more complex, essentially reverses this procedure while also recovering the data clock from the incoming signal. Adaptive equalization corrects for varying line conditions by automatically changing filter parameters to compensate for line characteristics. DPSK MODULATOR/DEMODULATOR The 73K324L modulates a serial bit stream into di-bit pairs that are represented by four possible phase shifts as prescribed by the Bell 212A/V.22 standards. The baseband signal is then filtered to reduce intersymbol interference on the bandlimited 2-wire PSTN line. Transmission occurs on either a 1200 Hz (Originate mode) or 2400 Hz carrier (Answer mode). Demodulation is the reverse of the modulation process, with the incoming analog signal eventually decoded into di-bits and converted back to a serial bit stream. The demodulator also recovers the clock, which was encoded into the analog signal during modulation. Demodulation occurs using either a 1200 Hz carrier (Answer mode or ALB Originate mode) or a 2400 Hz carrier (Originate mode or ALB Answer mode). The 73K324L use a phase locked loop coherent demodulation technique that offers excellent performance. Adaptive equalization is also used in DPSK modes for optimum operation with varying lines. FSK MODULATOR/DEMODULATOR The FSK modulator/demodulator produces a frequency modulated analog output signal using two discrete frequencies to represent the binary data. V.21 frequencies of 980 and 1180 Hz (originate mark and space), or 1650 and 1850 Hz (answer mark and space) are used in V.21 mode. V.23 mode uses 1300 and 2100 Hz for the main channel or 390 and 450 Hz for the back channel. Demodulation involves detecting the received frequencies and decoding them into the appropriate binary value. The rate converter and scrambler/descrambler are automatically bypassed in the FSK modes. PASSBAND FILTERS AND EQUALIZERS High and low band filters are included to shape the amplitude and phase response of the transmit and receive signals and to provide compromise delay equalization as well as rejection of out-of-band signals. The transmit signal filtering corresponds to a √&%% raised cosine frequency response characteristic. |
Similar Part No. - 73K324L-IGT |
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Similar Description - 73K324L-IGT |
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