CD22859 - Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator
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 prov
CD22859 Features
* Mute Drivers On-Chip
* Device Power can Either be Regulated DC or Telephone Loop Current
* Use of an Inexpensive 3.579545MHz TV Crystal Provides High Accuracy and Stability for all Frequencies Applications
* For Use In Dual-tone Telephone Dialing Systems Pinout CD
