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HD6433636SW Datasheet(PDF) 294 Page - Renesas Technology Corp |
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HD6433636SW Datasheet(HTML) 294 Page - Renesas Technology Corp |
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294 / 418 page  280 11.3 Operation 11.3.1 Output Waveform The DTMF generator outputs a row-group or column-group sine wave (DTMF signal) or a combined row-column waveform at the TONED pin. These signals are generated by a high- precision resistor-ladder-type D/A converter circuit. The output frequency is selected by DTCR. Figure 11.3 shows an equivalent circuit for the TONED output. Figure 11.4 shows the output waveform of an independent row-group or column-group signal. One cycle of the output is divided into 32 segments, giving a stable output with low distortion. Control Output control Row Column VT GND ref TONED Figure 11.3 Equivalent Circuit for TONED Output 123456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Time slot VT GND ref Figure 11.4 TONED Output Waveform (Independent Row- or Column-Group Output) |
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