TECHNICAL DATA
Tone Ringer
The IL2411 is a bipolar integrated circuit designed for
telephone bell replacement.
IL2411N/D
SOP 8
Designed for Telephone Bell Replacement
Low Current Drain
Adjustable 2-frequency Tone
Adjustable Warbling Rate
Extension Tone Ringer Modules
Alarms or Other Alerting Devices
Adjustable for Reduced Supply Initiation Current.
Built-in hysteresis prevents false triggering and rotary dial
‘Chirps’
DIP 8
T
A
= -45 to 65 C
ORDERING INFORMATION
Device
IL2411N
IL2411D
IL2411DT
Operating
Temperature Range
T
A
= -45 to 65 C
Package
DIP8
SOP8
SOP8
Packing
Tube
Tube
Tape & Reel
LOGIC DIAGRAM
PIN ASSIGNMENT
V CC
R
SL
LFI
LF0
OUT
HFI
HF0
GND
PIN 1 = V
CC
PIN 5 = GND
1.
2.
3.
4.
Output amplifier
High frequency oscillator
Low frequency oscillator
Hysteresis regulator
(Regulator circuit has built-in hysteresis to
prevent false triggering and rotary dial “Chirps”)
2011, March, Rev. 01
IL2411
PIN DESCRIPTION
Name
V
CC
R
SL
LFI
LF0
GND
HF0
HFI
Out
Pin
1
2
3
4
5
6
7
8
Positive power supply.
External resistor
Input low frequency oscillator
Output low frequency oscillator
Negative power supply
High frequency oscillator output
High frequency oscillator input
Tone output
Description
MAXIMUM RATINGS
*
Symbol
V
CC
P
D
Tstg
Parameter
DC Supply Voltage (Referenced to GND)
Power Dissipation in Still Air, Plastic DIP
Storage Temperature
Value
to +30.0
400
-65 to +150
Unit
V
mW
C
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
T
A
Parameter
DC Supply Voltage (Referenced to GND)
Operating Temperature
Min
13.0
-45
Max
29.0
+65
Unit
V
C
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
outputs must be left open.
2011, March, Rev. 01
IL2411
APPLICATION CIRCUIT
F
igure 3
APPLICATION NOTE
The application circuit illustrates the use of the IL2411 devices in typical telephone or extension tone ringer application.
The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenuated by capacitor C
1
and resistor R
1
.
C
1
also provides isolation from DC voltages (48V) on the exchange line.
After full wave rectification by the bridge diode, the waveform is filtered by capacitor C
4
to provide a DC supply for the
tone ringer chip.
As this voltage exceeds the initiation voltage (V
SI
), oscillation starts.
With the components shown, the ouptut frequency chops between 512(f
h1
) and 640Hz(f
h2
) at a 10Hz(f
L
) rate.
The loudspeaker load is coupled through a 1300 to 8 transformer.
The output coupling capacitor C
5
is required with transformer coupled loads.
When driving a piezo-ceramic transducer type load, the coupling C
5
and transformer (1300:8) are not required.
However, a current limiting resistor is required.
The low frequency oscillator oscillates at a rate (f
L
) controlled by an external resistor (R
2
) and capacitor (C
2
).
The frequency can be determined using the relation f
L
=1/1.289R
2
*C
2
. The high frequency oscillates at a f
H1
, f
H2
controlled by an external resistor (R
3
) and capacitor (C
3
). The frequency can be determined using the relation
f
H1
=1/1.504R
3
*C
3
, f
H2
=1/1.203R
3
*C
3
.
Pin 2 allows connection of an external resistor R
SL
, which is used to program the solpe of the supply current vs supply
voltage characteristics (see Fig2), and hence the supply current up to the initiation voltage ( V
SI
). This initiation voltage
remains constant independent of R
SL
.
The supply current drawn prior to triggering varies inversely with R
SL
, decreasing for increasing value of resistance.
Thus, increasing the value of R
SL
will decrease the amount of AC ringing current required to trigger the device. As such,
longer sucribser loops are possible since less voltage is dropped per unit length of loop wire due to the lower current
level. R
SL
can also be used to compensated for smaller AC couplin capacitors (C
5
on Fig 3) (higher impedance) to the
line which can be used to alter the ringer equivalence number of a tone ringer circuit.
The graph in Fig2 illustrates the variation of supply current with supply voltage. Three curves are drawn to show the
variation of initiation current with R
SL
. Curve B( R
SL
=6.8K) shows the I-V characteristic for the IL2411 tone ringer.
Curve A is a plot with R
SL
<6.8K and shows an increase in the current drawn up to the initiation voltageV
SI
. The I-V
characteristic after initiation remains unchanged. Curve C illustrates the effect of increasing R
SL
above 6.8K initiation
current decreases but again current after triggering is unchanged.
2011, March, Rev. 01
无线连接
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
