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Электронный компонент: IL2411

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TECHNICAL DATA


IL2411N/D
Tone Ringer

The IL2411 is a bipolar integrated circuit designed for telephone
bell replacement.
8-SOP
8-DIP

T
A
= -45
to 65 C
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'
LOGIC DIAGRAM
PIN 1 = V
CC
PIN 5 = GND
1.
Output amplifier
2.
High frequency oscillator
3.
Low frequency oscillator
4.
Hysteresis regulator
(Regulator circuit has built-in hysteresis to
prevent false triggering and rotary dial "Chirps")
PIN ASSIGNMENT
V
R
CC
LFI
LF0
OUT
HFI
HF0
GND
SL
1
IL2411


PIN DESCRIPTION
Name Pin
Description
V
CC
1
Positive power supply.
R
SL
2 External
resistor
LFI
3
Input low frequency oscillator
LF0
4
Output low frequency oscillator
GND
5
Negative power supply
HF0
6
High frequency oscillator output
HFI
7
High frequency oscillator input
Out 8
Tone
output



MAXIMUM RATINGS
*
Symbol Parameter
Value
Unit
V
CC
DC Supply Voltage (Referenced to GND)
to +30.0
V
P
D
Power Dissipation in Still Air, Plastic DIP
400
mW
Tstg
Storage Temperature
-65 to +150
C
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.



RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min
Max
Unit
V
CC
DC Supply Voltage (Referenced to GND)
13.0
29.0
V
T
A
Operating Temperature
-45
+65
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.
2
IL2411






ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND, T
A
= -20 to +70
C)
Guaranteed
Limits
Symbol Parameter
Test
Conditions
Min
Typ
Max
Unit
V
SI
Initiation Supply Voltage
(1)
See Figure 1
16.8
21.2
V
I
SI
Initiation Supply Current
(1)
1.4
4.2
mA
V
SUS
Sustaining Voltage (2)
See Figure 1
9.5
12.2
V
I
SUS
Sustaining Current (2)
No Load V
CC
=V
SUS
See Figure 1
0.7 2.5 mA
V
OH
High-Level Output
Voltage
V
CC
=21V, I
OH
=-15mA,
Pin 6=6V, Pin 7=GND
16.7
21.0 V
V
OL
Low-Level Output
Voltage
V
CC
=21V, I
OL
=15mA,
Pin 6=GND, Pin 7=6V
- 1.8 V
I
IN
Maximun Input Leakage
Current (Pin 3)
Pin 3=6V,Pin 4=GND,
V
CC
=21V
- 1.0
A
(Pin 7) Pin 7=6V,Pin 6=GND,
V
CC
=21V
- 1.0
A
f
H1
High Frequency 1
R
3
=191K
,C
3
=6800pF
461
563 Hz
f
H2
High Frequency 2
R
3
=191K
,C
3
=6800pF
576
704 Hz
f
L
Low Frequency
R
2
=165K
,C
2
=0.47
F
9.0 11.0 Hz

Notes:
1.
Initiation supply voltage (V
SI
) is the supply voltage required to start the tone ringer oscillating.
2.
Sustaining voltage (V
SUS
) is the supply voltage required to maintain oscillation.
3
IL2411

CIRCUIT CURRENT-SUPPLY VOLTAGE (NO LOAD)
Figure 1
SUPPLY CURRENT (NO LOAD) VC. SUPPLY VOLTAGE
Figure 2
4
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.
5