Intersil Corporation CD22859 Datasheet

Semiconductor

CD22859

OBSOLETE PRODUCT

NO RECOMMENDED REPLACEMENT

Data Sheet February 1999 File Number

Call Central Applications 1-800-442-7747

or email: [e-mail]

1257.4

[ /Title
(CD22

859)
/Sub­ject
(Monol
ithic
Sili­con
COS/
MOS
Dual­Tone
Multi­fre­quency
Tone
Gener­ator)
/Autho
r ()
/Key­words
(Har­ris
Semi­con­ductor,
Tele­com,
SLICs,
SLACs
, Tele­phone,
Tele­phony,
WLL,
Wire­less

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 inexpensive3.579545MHz 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
of driving external pnp receiver and transmitter muting
transistors are provided. A low input to the
tone generation, turns off the reference oscillator and causes
T

and RX outputs to go to logic ‘0’. During tone generation

X

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.

CD pin inhibits

X,RX

) capable

Ordering Information

TEMP.

PART NUMBER

CD22859E -40 to 85 16 Ld PDIP E16.3

RANGE (oC) PACKAGE

PKG.

NO.

Features

• Mute Drivers On-Chip

• Device Power can Either be Regulated DC or T elephone
Loop Current

• Use of an Inexpensive 3.579545MHz TV Crystal Provides
High Accuracy and Stability for all F requencies

Applications

• For Use In Dual-tone Telephone Dialing Systems

Pinout

CD22859

(PDIP)

TOP VIEW

V

V

DD

TX
C1
C2
C3

V

SS

OSC1
OSC2

1
2
3
4
5
6
7
8

16

OUT

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

CD22859

Absolute Maximum Ratings Thermal Information

Supply Voltage (VDD - VSS). . . . . . . . . . . . . . . . . . . . . . . -0.5 to 12V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD 0.5V

Power Dissipation, P

TA = -40oC to 60oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500mW

TA = 60oC to 85oC . . . . . Derate Linearly at 1.2mW/oC to 200mW

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

D

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

Electrical Specifications T

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)

No Keydown Mode 3.7 - 100 µA

Input Pull-Up Current 3 - 10 - 400 µA

Input Low Voltage (VIL) Maximum 3 - 10 - 0.2V

Input Low Voltage (VIH) Minimum 3 - 10 - 0.8V

Electrical Specifications T

= -25oC to 60oC, All Voltages Referenced to VSS = 0V

A

PARAMETER VDD (V) MIN MAX UNITS

3.7 - 2.7 mA

9.3 - 13 mA

9.3 - 200 µA

DD

DD

= -25oC to 60oC

A

V

V

PARAMETER VDD (V) VO (V) MIN MAX UNITS

STATIC TONE OUTPUTS (RL = 82Ω)

VO; Dual-Tone Output 3.7 - 9.3 - 350 700 mV

VO (CL); Single-Tone Output, Column (Note 3) 3.7 - 9.3 - 300 - mV

VO (RL); Single-Tone Output, Row (Note 4) 3.7 - 9.3 - 260 - mV

Distortion (Note 5) 3.9 - 9.3 - - 10 %

Rise and Fall Time (Dual-Tone Out) (Note 6) 3.9 - 9.3 - - 5 ms

Pre-Emphasis (Note 7) 3.9 - 9.3 - 1 3 dB

Output Frequency (Note 8) 3.9 - 9.3 - (Nom. -1%) (Nom. +1%) Hz

4-127

RMS

RMS

RMS