Wing Shing WS2418 Datasheet

The WS2418 is a monolithic integrated circuit telephone tone ringer with

WS2418

TELEPHONE TONE
RINGER WITH BRIDGE DIODE

8 DIP

WS2418

bridge diode, when coupled with an appropriate transducer, it replaces the
electromechanical bell. This device is designed for use with either a piezo
transducer or an inexpensive transformer coupled speaker to produce a pleasing
tone composed of a high frequency (f

) alternating with a low frequency (fL)

R

resulting in a warble frequency. The supply voltage is obtained from the AC
ring signal and the circuit is designed so that noise on the line or variation of
the ringing signal cannot affect correct operating of the device.

FEATURES

! On chip high voltage full wave diode bridge rectifier
! Low current consumption, in order to allow the parallel operation of the 4device
! Low external component count
! Tone and switching frequencies adjustable by external components
! High noise immunity due to built-in voltage current hysteresis
! Activation voltage adjustable
! Internal zener diodes to protect against over voltages
! Ringer impedance adjustable with external components
! Electronic telephone ringers
! Extension ringers

BLOCK DIAGRAM

ACTIVATION
VOLTAGE ADJUSTABLE

67

TIP

RECTIFIER
CAPACITOR

8

POWER

SUPPLY

CONTROL

CIRCUIT

RING

1

234

GND

SWEEP RATE
CONTROL CAPACITOR

ABSOLUTE MAXIMUM RATINGS (T

LOW
FREQ OSC

OUTPUT FREQUENCY
CONTROL RESISTOR

HIGH
FREQ OSC

=25℃℃℃℃)

A

OUTPUT
AMP

5

OUTPUT

SYMBOL CHARACTERISTIC VALUE UNIT

V

C

V

C(ON-OFF)

I

CC

T

OPR

T

STG

Absolute maximum rating are those values beyond which permanent damage to the device may
occur. These are stress rating only and functional operation of the device at or beyond them is not
implied. Long exposure to these conditions may affect device reliability.

Calling Voltage (f=50HZ) Continuous 120 V
Calling Voltage (f=50HZ)

200 V

RMS
RMS

5 sec On/10 Sec Off
Supply Current 22 mA
Operating Temperature -20~+70

Storage and Junction Temperature -65~+150

℃
℃

Wing Shing Computer Components Co., (H.K.)Ltd. Tel:[phone] Fax:[phone]
Homepage: http://www.wingshing.com E-mail: [e-mail]

DC ELECTRICAL CHARATERISTICS (TA=25℃℃℃℃)

WS2418

TELEPHONE TONE
RINGER WITH BRIDGE DIODE

1000

3.22X

Symbol Characteristics Min. Typ. Max. Units Test Conditions

V

V

R

V

V

I

CC

V

ONR

SUS

D(OFF)

O(P-P)

I

SC

Supply Voltage 26 V

CC

Current Consumption Without load 1.5 1.8 mA VCC=8.8 to 26V
Activation Voltage 12.2 13 V

ON

Activation Voltage Range 8 10 V
Sustaining Voltage 8 8.8 V

Different Resistance in OFF

6.4

KΩ

Condition
Output Voltage Swing VCC-3 V
Short Circuit Current 35 mA VCC=26V

R

A

=1KΩ

AC ELECTRICAL CHARACTERISTICS

Symbol Characteristic Min. Typ. Max. Units Test Conditions

f

F
F

H1
H2

H1R

f

Output Frequency

2300+300
1700+300

fH1 Range 0.1 15 KHz
Sweep Frequency 8 H

S

VCC=26V, R1=14KΩ

H

V

Z

=0V(PIN3)

C

VC=6V(PIN3)

=27KΩ To 1.7KΩ

R

1

R1=14KΩ,C1=100nF

Z

TEST AND APPLICATION CIRCUIT

TIP

TEL LINE

RING

1.75

1.75....10

10

1.751.75

ffff

1111

1010

==== , f

RRRR

(K )

(K )

(K )(K )

1

1

1 1

RRRR

1 F,250V

1 F,250V

1 F,250V1 F,250V

CCCC

2222

CCCC

3333

10 F

10 F

10 F10 F

4444

5555

, f

, f

====

ffff

, f

, f, f

, f, f

====

1111

2222

SSSS

7777

AC

AC

ACAC

800

800

800800

C1 (nF )

2.2K

2.2K

2.2K2.2K

VVVV

RRRR

2222

CC

CC

CCCC

AAAA

88885

7777

WS2418

1111 22223

CCCC

1111

100nF

100nF

100nF100nF

56666

55

34

4

33

44

RRRR

1111

12K

12K

12K12K

10K

10K

10K10K

Piezo

Piezo

PiezoPiezo

0.22 F

0.22 F

0.22 F0.22 F

VVVV

OUT

OUT

OUTOUT

10K

10K

10K10K

DESCRIPTION

The WS2418 tone ringer device its power supply by rectifying the AS ringing signal. It uses this
power to activate two tone generators. The two tone frequen cie s genera to rs are switc hed by an internal
oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker, both tone
frequencies and the switch frequency can be externally adjusted

1300 :8

The devices can driver either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case
of using a loudspeaker, a transformer is need.4

An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator,
and high frequency oscillator. To protect the IC telephone line transients, a zener diode is include.