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CMX624D5 Datasheet(PDF) 10 Page - CML Microcircuits |
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CMX624D5 Datasheet(HTML) 10 Page - CML Microcircuits |
10 / 26 page V23 / Bell 202 Modem CMX624 2003 CML Microsystems Plc 10 D/624/7 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 Hz dBm V23 Bell 202 Figure 5 Maximum Out of Band Tx Line Energy Limits 1.5.8 Transmit Output Buffer This buffer amplifier, connected to the TXN, TXO and TXON pins, is intended for use as a Tx line driver as shown in Section 1.6.1. Two symmetrical outputs are provided for use with a balanced load to give sufficient Tx line signal levels even at low VDD. If this is not required the TXON output can be disabled. If the buffer is used as a balanced line driver, then bit 6 of the SETUP Register should be set to ‘1’ (TXON output enabled). Setting bit 6 to ‘0’ disables the TXON output and the buffer draws less current from the supply. When bit 6 is set to '0' the TXON pin should be left open circuit. N.B. The TXO output is unaffected by this bit. 1.5.9 Ring Signal Detector This block, which functions even in Zero Power mode, can be used to detect a telephone line Ring Signal or Line Voltage Reversal and then generate a Interrupt Request signal to wake up the µC at the start of a call. Suitable interface circuits are shown in Section 1.6.2. The output of this block is the ‘Ring Detect’ line shown in Figure 1 which directly drives bit 6 of the FLAGS Register. Any ‘0’ to ‘1’ or ‘1’ to ‘0’ change on this line will also set the ‘Ring Detect Change’ bit (5) of the FLAGS Register. If this block is not used, then the RD and RT pins should be connected to VSS and the ‘Ring Detect Change’ bit (5) of the IRQ MASK Register set to ‘0’. |
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