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Электронный компонент: IL2533D

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TECHNICAL DATA
MULTISTANDARD
CMOS
IC
OF SINGLE CHIP PHONE WITH
DOUBLE SOFT LIMITATION
Description
IL2533N, IL2533D is CMOS IC, supporting all functions, necessary for design of electronic
telephone with high characteristics. Standard application circuit is shown at figure 2.
Device includes LD/MF constant automatic dialer, melodies generation, ring frequency
identification and high quality circuit for line/speech.
RAM at chip, intended for redialing of 31-digit number and memory elements, containing upto 21
symbols/data. Floating marker method enables to use LNR function under control of different
systems. Device contains volume control of hearing aid. Volume is controlled by VOL button
(5.4dB) or "-/+" button (plus 8.1/minus 5.4dB in 5 levels).

Main features
Line/speech circuit. LD/MF constant automatic dialer
and tone ring at one 28-pin CMOS chip.
Operational range 13 to 100 m (decreasing upto 5 m
causes productivity deterioration).
Soft limitation for elimination of drastic distortion.
Controlling of received signal volume.
Automatic line loss compensation.
Low noise level (max - 72 dBmp).
Actual or complex impedance.
Switching LD/MF dialing.
Tone damper during programming.
Redial of the last 31 digit number.
Reference storage.
Redial of busy line or previous connection.
Pause button for applying to pause or waiting function.
3 pulse flashes: buttons, "R1"-100 ms, "R2" - 280 ms
and "R3" - 375/600 ms.
Active RC-filter on chip.
Circuit of ring frequency determination.
Three-tone melody generator
01
02
28
27
03
04
26
25
05
06
24
23
07
08
22
21
09
11
20
18
13
14
16
15
10
12
19
17
LS
MFL
RO
VDD
AGND
STB
CI
LO
LCC
OSC
C4
C3
HS/DP
MODE
RI
LI
VSS
CS
M2
M1
LED
FCI
R1
R3
C1
C2
R2
R4
package pin out
PACKAGE
IL2533D assembly to 28-pin SO-package
MS-013AE.
IL2533N assembly to 28-pin DIP-package
MS-011AB.






1
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IL2533


Versatility of the circuit provides possibility of variants selecting on circuit`s pin and several outer
components. It allows adapting easily to the requirements of different standard (post, telephone
and telegraph). Description of circuits` pins is shown at table 1.


La
L
b
Adaptation to line
Power supply generating
Masking on direct current
V
DD
L1
CS
C1
Line current
reading
Soft encrease
LS
Tune generator
Ring frequency
determination
Controlling logic
V
SS
HS/DP
LLC
R1
STB
AGND
Clock
oscillator
OSC
AGND
LLC Hi
LLC Lo
LLC Off
Keyboard controller
RAM
MFL
Sound
switch
off
LED
RO
M2
M1
R1
R2
R3
R4
4
3
2
1
Keyboard
MODE
R1
R2
C1
R3
R4
R5
R6
R7
R8
R9
R10
R11
R13
R12
R14
R15
R16
R17
R18
R19
R20
R21
C4
C2
C3
C5
C6
C7
C8
C9
C10
C11
SA1
SA2
SA3
VD1
VD2
VD3
VD4
VD5
VD6
VD9
VD10
VD8
VD7
VT1
VT2
VT3
VT4
Figure 2 - Typical application flow-chat
2
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IL2533


Table 1 - Circuit pins description
Pin
No
Pin letter
symbol
Function
01
LS
Line current input.
Input for line current determination (responsibility setup)
02
MFL
MF level setup.
For DTMF level setup can be used potential divider, connected from this pin to
A
GND
and to V
SS
03 RO
Receipt
output
Output for controlling of dynamic hearing aid with impedance from 140 to 300
hm
04 V
DD
Positive supply voltage.
Supply voltage output for circuit
05 A
GND
Analog ground, Analog ground for amplifiers
06
STB
Balanced input side tone.
Input for side tone suppression
07
CI
Entire impedance output.
For complex impedance, capacitor should be connected to this output
08
MO
Melody output.
Melody generator PWM-output for tone ring.
When output not active, in "Switch off" state
09
LLC
Line waste compensation.
Selected output for loss compensation in line.
LLC=A
GND
: 20-50 m; LLC=V
DD
: 45-75 m; LLC=V
SS
:no compensation
10
HS/DP
Switch hook input and output of pulse dialing.
Analog input/output, establishing by high switch hooks by off-hook and open
drain set it in low state during interruptions for pulse dialing and flash pulses
11 OSC
Oscillator
input.
Input for ceramic resonator (3.5 Hz)
12
MODE
Input of mode denomination selection.
Mode
output
Function
Open
Interlocking number dialing
Row 1
LD mode, 10 pulse/s, 33/66ms
Row 2
LD mode, 10 pulse /s , 40/60ms
Row 3
LD mode, 20 pulse /s , 16/33ms
Row 4
LD mode, 20 pulse /s , 20/30ms
Row 5
LD mode, 10 pulse /s, 33/66ms. Temporary MF with
tone on first button input "
"
Row 6
Only MF, 82/82ms
Row 7
Only MF, 82/160ms
Note - Pulse/s -- pulses per second.
During temporary MF : 82/160ms
13 C4
14 C3
15 C2
16 C1
Keyboard line.
(see keyboard scheme at figure 3)
3
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IL2533

Table 1 continued
Pin
No
Pin letter
symbol
Function
17 R4
18 R3
19 R2
20 R1
Keyboard line.
(see keyboard scheme at figure 3)
21
FCI
Frequency comparator input.
Schmitt flip-flop input for ring frequency determination
22
LED
LED output driver.
Output for LED control, blinking in "Program / Mute "state
23
24
M1
M2
Microphone outputs
Differential inputs for microphone (electret type)
25
CS
Input of current shunting control.
Given N-channel output with open drain controls outer shunting high capacity
transistor for modulation of line voltage and for line shorting during period of
pulse number dialing
26 V
SS
Negative supply connection
27 LI
Line
input.
Input is used for power abstraction and (adjusting) of line current
28
RI
Receipt input.
Input for signal received
*Note - LD - pulse number dialing;
*MF - frequency number dialing;
*DTMF - two-frequency dialing (often case of frequence dialing)

Function selection (general table)
Function
Straight memory (single key)
4
Indirect memory (two key)
10
Redialing yes
LNR key
yes
Insert by LNR pause key
yes
Pause key PS
yes
/ key or
/
Tone/Pulse key (/) yes
Temporary MF key "
"
yes
Automatic setup key ( - D)
yes
Volumes keys (VOL, "-/+")
yes
Volume reset by off-hook
yes
Tone ring programming
yes
Pause duration "flash" R3
600m
4
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IL2533

KEYBOARD CONNECTING
Keyboard connecting is shown at figure 3.
Key closed, R
ON
MAX
= 1 Ohm
Key opened, R
OFF MIN
= 1 Ohm
P/M
1
2
3
4
5
6
7
8
9
0
*
#
R1
R2
R3
LNR
VOL
+
-
A
B
C
D
RP
PS
T/P
M1
M2
M3
M4
MR
C1
C2
C3
C4
R1
R2
R3
R4
Figure 3 - Keyboard connecting
Power-up set up
On-chip voltage on preset circuit traces supply voltage V
DD
during receiver off-hook.
When V
DD
increase reaches level approximately 1.2 V, preset circuit empties RAM.
Direct current conditions
Typical operational range is from 13 to 100 m. Operational range by lowered effectiveness
is from 5 to 13 m (parallel operation). In operational range all functions are active.
By line currents lower than 13 m microcircuit provides additional decrease lower than 4.5 V
in order to allow parallel operation (see fig. 4).
Direct current characteristic (excluding diode bridge) determining by voltage to LI and R1
resistor by line currents higher than 13 m by following form:
V
LS
= V
LI
+ I
LINE
R1
(1). Voltage at LI is 4.5 V in typical operational range. In dialing mode, speech scheme and
inactive device parts is in mode of decreased power consumption with the purpose of current
saving. CS output pulls up to Vss in order to connect outer shunting transistor for supporting of low
voltage at LS output within periods forming.
IMPEDANCE FOR ALTERNATING CURRENT
Circuit impedance on alternating current is adjusting by outer components. Impedance can
be actual and complex. Alternating-current resistance Z
AC
, Ohm, is determining according to
following form
Z
AC
= 33
Z
1
5

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