Replacement of
KA2418
MIK2418
Tone Ringer with Brige
Diode
December 1997 - revised May 2000
Description
The MIK2418 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
Applications
Electronic telephone ringers
Extension ringes
Package Information
Block Diagram
Absolute Maximum Ratings
(Ta=25
C)
Symbol Parameter Maximum
Units
V
C
Calling Voltage (f=50Hz) Continuous
120
Vrms
V
C(ON-OFF)
Calling Voltage (f=50Hz)
5 Sec On/10 Sec OFF
200 Vrms
I
CC
Supply
Current
22
mA
T
OPR
Operating
Temperature
-20
+70
C
Tstg
Storage and Junction Temperature
-65
+150
C
Absolute maximum ratings are those values beyond which permanent damage to the device may occur. These are stress ratings only
and functional operation of the device at or beyond them is not implied. Long exposure to these conditions may affect device reliability.
Page 1 of 3
Replacement of
KA2418
MIK2418
Tone Ringer with Brige
Diode
December 1997 - revised May 2000
DC Electrical Characteristics
(T
a
= 25
C)
Symbol Parameter
Test
Conditions
Min
Typ
Max
Units
V
CC
Supply
Voltage
26
V
I
CC
Current Consumption without Load
V
CC
= 8.8 to 26V
1.5
1.8
mA
V
ON
Activation
Voltage
12.2
13
V
V
ONR
Activation Voltage Range
R
A
= 1K
8 10
V
V
SUS
Sustaining
Voltage
8
8.8
V
R
D(OFF)
Differential Resistance in Off Condition
6.4
K
V
O(P-P)
Output Voltage Swing
V
CC
- 3
V
I
SC
Short Circuit Current
V
CC
= 26V
35
mA
AC Electrical Characteristics
Symbol Characteristic
Test
Conditions
Min
Typ
Max
Units
f
H1
2300
f
H2
Output Frequency
V
CC
= 26V, R
1
= 14K
V
C
= 0V (Pin 3)
V
C
= 6V (Pin 3)
1700
Hz
f
H1R
f
H1
Range
R
1
= 27K
to 1.7 K
0.1 15
KHz
f
S
Sweep
Frequency
R
1
= 14K
,C1 = 100nF
10 Hz
Test and Application Circuit
MIK2418
R
A
TIP
V
CC
8
6
5
7
1
2
3
4
RING
TEL LINE
1 F, 250V
AC
2.2K
R
2
R
1
14K
C
2
C
3
10 F
C
1
100nF
0.22F
10K
10K
1300
: 8
Piezo
V
OUT
+
)
(
1000
,
7
5
,
)
(
10
22
.
3
1
1
2
1
4
1
nF
C
f
f
f
K
R
f
s
=
=
=
Description
The MIK2418 tone ringer devices 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 device can drive either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using a loudspeaker, a
transformer is need.
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 included.
Page 2 of 3
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