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參數(shù)資料
| 型號： | CD22859E |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator |
| 中文描述： | TELEPHONE DIALER CKT, PDIP16 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大?。?/td> | 38K |
| 代理商： | CD22859E |
Semiconductor
4-126
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-800-4-HARRIS or 407-727-9207
|
Copyright
Harris Corporation 1999
CD22859
Monolithic Silicon COS/MOS Dual-Tone
Multifrequency Tone Generator
The CD22859 is a CMOS dual-tone multifrequency (DTMF)
tone generator for use in dual-tone telephone dialing
systems. The device can easily be interfaced to a standard
push-button telephone keyboard to provide enabling
operation directly with the telephone lines.
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
sinusoidal tones are digitally synthesized by a stair-step
approximation.
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
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
X
, R
X
) 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
T
X
and R
X
outputs to go to logic ‘0’. During tone generation
mode, CD = 1 and T
X
, R
X
= logic 1.
The row, column and CD inputs are provided with pull-up
resistors to allow the use of SPST switch matrixes.
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
CD22859
(PDIP)
TOP VIEW
Ordering Information
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
CD22859E
-40 to 85
16 Ld PDIP
E16.3
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
V
DD
TX
C1
C2
C3
V
SS
OSC2
OSC1
V
OUT
R1
R2
R3
R4
RX
C4
CD
Data Sheet
February 1999
File Number
1257.4
[ /Title
(CD22
859)
/Sub-
ject
(Monol
ithic
Sili-
con
COS/
MOS
Dual-
Tone
Multi-
fre-
quency
Tone
Gener-
ator)
/Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor,
Tele-
com,
SLICs,
SLACs
, Tele-
phone,
Tele-
phony,
WLL,
Wire-
less
OBSOLETE PRODUCT
or email: centapp@harris.com
Call Central Applications 1-800-442-7747
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