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PDF CD22859E Data sheet ( Hoja de datos )
| Número de pieza | CD22859E | |
| Descripción | Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CD22859E (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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Semiconductor
CD22859
File Number 1257.4
Monolithic Silicon COS/MOS Dual-Tone
Multifrequency Tone Generator
[ /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
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 (TX, RX) 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
TX and RX outputs to go to logic ‘0’. During tone generation
mode, CD = 1 and TX, RX = logic 1.
The row, column and CD inputs are provided with pull-up
resistors to allow the use of SPST switch matrixes.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
CD22859E
-40 to 85 16 Ld PDIP
PKG.
NO.
E16.3
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
VDD 1
TX 2
C1 3
C2 4
C3 5
VSS 6
OSC1 7
OSC2 8
16 VOUT
15 CD
14 R1
13 R2
12 R3
11 R4
10 RX
9 C4
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
1 page  
Functional Diagram
C1 3
C2 4
C3 5
C4 9
CD 15
VDD
R1 14
R2 13
R3 12
R4 11
OSC 1 7
OSC 2 8
CD22859
VDD
COUNT CONT.
COL. DIVIDER
C1-46 C3-38
C2-42 C4-34
COL
SENSE
COL INH
÷ 32
DA
ROW
SENSE
ROW DIVIDER
R1-80 R3-66
R2-73 R4-59
COUNT
CONT.
÷ 32
DA
ROW INH
ENABLE
OP AMP
OSC
÷2
MUTE
CONTROL
VDD
1
16
VOUT
RX
10
TX
2
VSS
6
d a D1
L1 G
1K D2
1.65K
2.55K
I 51K
TX RX
F RR
B GN
GN
g
f
IT
VDD
+
RX
TX
/CD
1
OSC1
A
K
b
L2
a
c
C2
C1
R1
V1
R2
V2
L4
C3
L1 L2
D3 NETWORK
OSC2
8
VOUT
RL
R4
R3
VSS
C
D4
FIGURE 2. INTERFACE WITH STANDARD K500 TELEPHONE NETWORK
KEYPAD
123
456
789
*0#
4-130
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet CD22859E.PDF ] | |
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