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