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CMX624D5 Datasheet(PDF) 6 Page - CML Microcircuits |
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CMX624D5 Datasheet(HTML) 6 Page - CML Microcircuits |
6 / 26 page V23 / Bell 202 Modem CMX624 2003 CML Microsystems Plc 6 D/624/7 1.4 External Components R1 100k Ω C1, C2 18pF X1 3.579545MHz C3, C4 0.1 µF C5 * Resistors ±5%, capacitors ±10% unless otherwise stated. * This component is only required for compatibility with CMX644A, see CMX644A Data Sheet for further details. Figure 2 Recommended External Components for Typical Application 1.5 General Description The CMX624 contains a V.23/Bell 202 compatible FSK modem capable of duplex operation at 1200/75 or 1200/150 bps over a 2-wire line or 1200/1200 bps over a 4-wire line, a flexible FSK data UART, a receive FSK or Call Progress Tone energy detector, a 2100Hz detector, a DTMF generator, a Tx line driving buffer amplifier, a telephone line Ringing Signal or Line Voltage Reversal detector and a 3.579545MHz Xtal oscillator. These functions are all controlled over a ‘C-BUS’ serial µC interface which also carries the transmit and receive FSK modem data. 1.5.1 Xtal Osc and Clock Dividers Frequency and timing accuracy of the CMX624 is determined by a 3.579545MHz clock present at the XTAL/CLOCK pin. This may be generated by the on-chip oscillator inverter using the external components C1, C2 and X1 of Figure 2, or may be supplied from an external source to the XTAL/CLOCK input. If the clock is supplied from an external source, C1, C2 and X1 should not be fitted. The on-chip oscillator is turned off in the 'Zero-Power' mode. If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must be set when the clock is not available. Failure to observe this rule may cause a rise in the supply current drawn by CMX624. |
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