Datasheet > CD22859E

CD22859E

更新时间： 2024-11-04 22:35:47

品牌	Logo	应用领域
英特矽尔 - INTERSIL		/
页数	文件大小	规格书
5页	42K
描述
Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator

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CD22859E 数据手册

CD22859

Semiconductor

Data Sheet

February 1999

File Number 1257.4

Monolithic Silicon COS/MOS Dual-Tone

Multifrequency Tone Generator

Features

• Mute Drivers On-Chip

[ /Title The CD22859 is a CMOS dual-tone multifrequency (DTMF)

• Device Power can Either be Regulated DC or Telephone

Loop Current

tone generator for use in dual-tone telephone dialing

(CD22

859)

/Sub-

ject

(Monol

ithic

Sili-

systems. The device can easily be interfaced to a standard

push-button telephone keyboard to provide enabling

operation directly with the telephone lines.

• Use of an Inexpensive 3.579545MHz TV Crystal Provides

High Accuracy and Stability for all Frequencies

The CD22859 generates standard DTMF sinusoidal dialing

tones from an on-chip reference crystal oscillator. The

reference oscillator uses an inexpensive 3.579545MHz color

TV crystal to create highly stable and accurate tones. The

Applications

• For Use In Dual-tone Telephone Dialing Systems

Pinout

con

sinusoidal tones are digitally synthesized by a stair-step

approximation.

CD22859

(PDIP)

TOP VIEW

COS/

MOS

Dual-

Tone

Multi-

fre-

quency

Tone

Gener-

ator)

One of four low-frequency band row tones and one of four

high-frequency band column tones are selected by driving

one of the four row inputs and one of the four column inputs

low. Simultaneous selection of more than one row input

and/or more than one column input will inhibit tone

16 V

OUT

15 CD

14 R1

13 R2

12 R3

11 R4

10 RX

generation, or generate a single-tone sinusoid. These

operating modes are described in the functional truth table.

Control logic is included to allow easy interface to standard

K500-type telephones. Two CMOS outputs (T , R ) capable

of driving external pnp receiver and transmitter muting

transistors are provided. A low input to the CD pin inhibits

tone generation, turns off the reference oscillator and causes

OSC1

/Autho

r ()

OSC2

/Key-

words

(Har-

ris

T and R outputs to go to logic ‘0’. During tone generation

X X

mode, CD = 1 and T , R = logic 1.

The row, column and CD inputs are provided with pull-up

resistors to allow the use of SPST switch matrixes.

Semi-

con-

ductor,

Tele-

com,

Ordering Information

TEMP.

PKG.

NO.

PART NUMBER RANGE ( C)

PACKAGE

16 Ld PDIP

CD22859E -40 to 85

E16.3

SLICs,

SLACs

, Tele-

phone,

Tele-

phony,

WLL,

Wire-

less

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

4-126

12 3 4 5

中文翻译

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