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Intersil Electronic Components Datasheet

CD22859 Datasheet

Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator

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Semiconductor
DaCNtaaOllSCRhoeEernOCeetrOtBmaSMlaOAiMl:pLEpEcNlTeiDcnEaEtaPtDipoRpRnO@sEDP1hUL-aC8Ar0rTCi0sE-.4cM4oF2Em-eN7bT7r4u7ary 1999
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


Intersil Electronic Components Datasheet

CD22859 Datasheet

Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator

No Preview Available !

CD22859
Absolute Maximum Ratings
Supply Voltage (VDD - VSS). . . . . . . . . . . . . . . . . . . . . . . -0.5 to 12V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD 0.5V
PoTwTAAe=r=D6-i04so0sCoipCatottioo8n56,o0PCoDC.
.
.
.
.
.
.
.
.
......
Derate
.......
Linearly
..
at
. . . . . . . . . . .500mW
1.2mW/oC to 200mW
Thermal Information
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .175oC
Maximum Junction Temperature (Plastic) . . . . . . . . . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC
Operating Conditions
Power Dissipation Per Output . . . . . . . . . . . . . . . . . . . . . . . .100mW
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications TA = -25oC to 60oC, All Voltages Referenced to VSS = 0V
PARAMETER
VDD (V)
MIN
MAX
UNITS
DYNAMIC DC SUPPLY VOLTAGE
Tone Generation Mode with Valid Input (Note 1)
2.5 10
V
Non-Tone Generation (Note 2)
1.7 10
V
DYNAMIC OPERATING CURRENT
Tone Generation Mode
(Outputs Unloaded)
3.7 - 2.7 mA
9.3 - 13 mA
No Keydown Mode
3.7 - 100 µA
9.3 - 200 µA
Input Pull-Up Current
3 - 10
- 400 µA
Input Low Voltage (VIL) Maximum
Input Low Voltage (VIH) Minimum
3 - 10
3 - 10
- 0.2VDD V
- 0.8VDD V
Electrical Specifications TA = -25oC to 60oC
PARAMETER
STATIC TONE OUTPUTS (RL = 82)
VO; Dual-Tone Output
VO (CL); Single-Tone Output, Column (Note 3)
VO (RL); Single-Tone Output, Row (Note 4)
Distortion (Note 5)
Rise and Fall Time (Dual-Tone Out) (Note 6)
Pre-Emphasis (Note 7)
Output Frequency (Note 8)
VDD (V)
VO (V)
MIN
MAX
UNITS
3.7 - 9.3
-
350
700 mVRMS
3.7 - 9.3
-
300
- mVRMS
3.7 - 9.3
-
260
- mVRMS
3.9 - 9.3
-
-
10 %
3.9 - 9.3
-
-
5 ms
3.9 - 9.3
-
1
3 dB
3.9 - 9.3
-
(Nom. -1%) (Nom. +1%)
Hz
4-127


Part Number CD22859
Description Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator
Maker Intersil Corporation
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CD22859 Datasheet PDF






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