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CD22859

Intersil Corporation
Part Number CD22859
Manufacturer Intersil Corporation
Description Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator
Published Mar 23, 2005
Detailed Description 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 ...
Datasheet PDF File CD22859 PDF File

CD22859
CD22859

Overview
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 oscillator uses an inexpensive 3.
579545MHz color SiliTV crystal to create highly stable and accurate tones.
The con sinusoidal tones are digitally synthesized by a stair-step approximation.
COS/ MOS One of four low-frequency band row tones and one of four Dual- high-frequency band column tones are selected by driving one of the four row inputs and one of the four column inputs Tone Multi- low.
Simultaneous selection of more than one row input and/or more than one column input will inhibit tone fregeneration, or generate a single-tone sinusoid.
These quency operating modes are described in the functional truth table.
Tone Gener- Control logic is included to allow easy interface to standard K500-type telephones.
Two CMOS outputs (TX, RX) capable ator) of driving external pnp receiver and transmitter muting /Autho transistors are provided.
A low input to the CD pin inhibits r () tone generation, turns off the reference oscillator and causes TX and RX outputs to go to logic ‘0’.
During tone generation /Keymode, CD = 1 and TX, RX = logic 1.
words (HarThe row, column and CD inputs are provided with pull-up resistors to allow the use of SPST switch matrixes.
ris SemiOrdering Information conTEMP.
PKG.
ductor, PART NUMBER RANGE (oC) PACKAGE NO.
TeleCD22859E -40 to 85 16 Ld PDIP E16.
3 com...


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