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HD6433636SW Datasheet(PDF) 288 Page - Renesas Technology Corp |
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HD6433636SW Datasheet(HTML) 288 Page - Renesas Technology Corp |
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288 / 418 page  274 11.1.1 Features Features of the DTMF generator are as follows. • Generates sine waves with DTMF frequencies from the system clock input at the OSC pins (f OSC) The OSC clock (1.2 MHz to 10 MHz, selectable in 400-kHz steps) is divided to generate a 400-kHz clock. Input to a feedback loop with a modified programmable divider and sine-wave counter, this clock is used to generate sine waves with the DTMF frequencies. • Stable sine-wave output with low distortion Sine waves are output from a high-precision resistor-ladder-type D/A converter. Each cycle is divided into 32 segments to give a stable waveform with low distortion. • Composite or single waveform output Register settings can select combined row-and-column-group output, or independent row- group or column-group output. |
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