Semiconductor T UCT ROD ACEMEN 47 P E 7 T L OLE REP 00-442-7 OBS ENDED 8 M ns 1 .
com COM pplicatio @harris E R NOSheet tapp ral A Data February 1999 Cent ail: cen l l a m C e or CD22859 File Number 1257.
4 Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator [ /Title The CD22859 is a CMOS dual-tone multifrequency (DTMF) (CD22 tone generator for use in dual-tone telephone dialing systems.
The device can easily be interfaced to a standard 859) push-button telephone keyboard to provide enabling /Suboperation directly with the telephone lines.
ject (Monol The CD22859 generates standard DTMF sinusoidal dialing tones from an on-chip reference crystal oscillator.
The ithic reference...

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