WS2418
TELEPHONE TONE
RINGER WITH BRIDGE DIODE
8 DIP
The WS2418 is a monolithic integrated circuit telephone tone ringer with
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
R
) alternating with a low frequency (f
L
)
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
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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
WS2418
BLOCK DIAGRAM
RECTIFIER
CAPACITOR
ACTIVATION
VOLTAGE ADJUSTABLE
7
TIP
6
8
POWER
SUPPLY
CONTROL
CIRCUIT
LOW
FREQ OSC
HIGH
FREQ OSC
OUTPUT
AMP
5
OUTPUT
RING
1
2
GND
3
4
SWEEP RATE
OUTPUT FREQUENCY
CONTROL CAPACITOR CONTROL RESISTOR
ABSOLUTE MAXIMUM RATINGS (T
A
=25℃)
℃
SYMBOL
V
C
V
C(ON-OFF)
I
CC
T
OPR
T
STG
CHARACTERISTIC
Calling Voltage (f=50H
Z
) Continuous
Calling Voltage (f=50H
Z
)
5 sec On/10 Sec Off
Supply Current
Operating Temperature
Storage and Junction Temperature
VALUE
120
200
22
-20~+70
-65~+150
UNIT
V
RMS
V
RMS
mA
℃
℃
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.
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage:
http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
WS2418
Symbol
V
CC
I
CC
V
ON
V
ONR
V
SUS
R
D(OFF)
V
O(P-P)
I
SC
TELEPHONE TONE
RINGER WITH BRIDGE DIODE
Characteristics
Min.
Typ.
1.5
12.2
8
8
6.4
V
CC
-3
35
DC ELECTRICAL CHARATERISTICS (T
A
=25℃)
℃
Max.
26
1.8
13
10
8.8
Units
V
mA
V
V
V
KΩ
V
mA
Test Conditions
V
CC
=8.8 to 26V
R
A
=1KΩ
Supply Voltage
Current Consumption Without load
Activation Voltage
Activation Voltage Range
Sustaining Voltage
Different
Resistance
in
OFF
Condition
Output Voltage Swing
Short Circuit Current
V
CC
=26V
AC ELECTRICAL CHARACTERISTICS
Symbol
F
H1
F
H2
f
H1R
f
S
Characteristic
Output Frequency
Min.
Typ.
2300+300
1700+300
Max.
Units
H
Z
Test Conditions
V
CC
=26V, R1=14KΩ
V
C
=0V(PIN3)
V
C
=6V(PIN3)
R
1
=27KΩ To 1.7KΩ
R
1
=14KΩ,C
1
=100nF
f
H1
Range
Sweep Frequency
0.1
8
15
KHz
H
Z
TEST AND APPLICATION CIRCUIT
TIP
1
F,250V
AC
2.2K
R
A
0.22 F
10K
C
2
R
2
8
6
5
10K
TEL LINE
C
3
10
F
V
CC
7
1
2
WS2418
Piezo
3
4
V
OUT
1300 :8
C
1
100nF
R
1
12K
RING
5 f , f =
1000
1.75.10
4
1.75
.
800
f
1
=
3.22X
, f
2
=
7
1
S
C (nF )
R
1
(K )
1
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 frequencies generators are switched 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
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.
Analog electronics
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