TS2418
1-4
2004/09 rev. A
TS2418
Telephone tone ringer with bridge diode
Supply Voltage 26V (max.)
Calling Voltage (f=50Hz) Continuous
General Description
The TS2418 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 can not affect correct operation 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 4 devices.
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.
Ordering Information
Part No.
Operating Temp.
Package
TS2418CD
DIP-8
TS2418CS
-20 ~ +70
o
C
SOP-8
Block Diagram
TS2418
2-4
2004/09 rev. A
Absolute Maximum Rating
Description Symbol
Value
Unit
Calling Voltage (f=50Hz) Continuous
V
TP
120
Vrms
Calling Voltage (f=50Hz) 5 Sec ON/10 Sec OFF
V
TP
200
Vrms
Supply Current
I
CC
22
mA
Operating Temperature
T
OP
-20~+70
0
C
Storage and Junction Temperature Tstg
-65~+150
0
C
Note: *Maximum Rating are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
Recommended Operating Conditions
Description Symbol
Min
Max
Unit
Supply Voltage
V
CC
-- 26 V
Operating Temperature
T
A
-20 +70
0
C
Note: This device contains protection circuitry to guard against damage due to high static voltages or electric fields.
However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this
high-impedance circuit. For proper operation, V
IN
and V
OUT
should be constrained to the range GND
(V
IN
or V
OUT
)
V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
). Unused output must
be left open.
Electrical Characteristics
(Ta=25
0
C
unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
V
CC
-- -- 26 V
Current Consumption without Load
I
CC
Vs = 8.8 to 26V
--
1.5
1.8
mA
Activation Voltage
V
ON
12.2 -- 13 V
Activation Voltage Range
V
ONR
R
A
=1K
8.0
--
10
V
Sustaining Voltage
V
SUS
8.0 -- 8.8 V
Differential Resistance in Off Condition
R
D
6.4 -- -- K
Output Voltage Swing
V
OUT
-- V
CC
-3 -- V
Short Circuit Current
I
OUT
Vs=26V
-- 35 -- mA
AC Operation
Output Frequency
f
H1
f
H2
f
H1
f
H2
V
CC
=26V,R1=14K
V
CC
=0V
V
CC
=6V
2300
1700
Hz
Hz
f
H1
Range
R1=27K
to 1.7 K
0.1
--
15
KHz
Sweep Frequency
f
L
R1=14K
,C1=100nF --
10
--
Hz
TS2418
3-4
2004/09 rev. A
Test and Application Circuit
.
Description:
The TS2418 tone ringer derives its power supply by rectifying the AC ringing signal. It uses this power to activate two
tone generators. The two tone frequencies generated are switched by internal oscillator in a fast sequence and made
audible across an output amplifier in the loudspeaker; both tone frequencies and the switching frequency can be
externally adjusted.
The device can drive either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using a
loud-speaker, a transformer is needed.
An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, and high f
frequency oscillator. To protect the IC from telephone line transients, a zener Diode is included.
TS2418
4-4
2004/09 rev. A
SOP-8 Mechanical Drawing
C
P
B
D
K
G
1
8
A
16
9
R
M
F
SOP-8 DIMENSION
MILLIMETERS INCHES
DIM
MIN MAX MIN MAX
A 4.80 5.00 0.189 0.196
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G
1.27 (typ)
0.05 (typ)
K 0.10 0.25 0.004 0.009
M 0
o
7
o
0
o
7
o
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
DIP-8 Mechanical Drawing
C
K
D
G
B
A
1
8
4
5
L
M
J
DIP-8 DIMENSION
MILLIMETERS INCHES
DIM
MIN MAX MIN MAX
A 9.07 9.32 0.357 0.367
B 6.22 6.48 0.245 0.255
C 3.18 4.45 0.125 0.135
D 0.35 0.55 0.019 0.020
G
2.54 (typ)
0.10 (typ)
J 0.29 0.31 0.011 0.012
K 3.25 3.35 0.128 0.132
L 7.75 8.00 0.305 0.315
M - 10
o
- 10
o
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