IL2533A

TECHNICAL DATA
MULTISTANDARD CMOS IC OF SINGLE CHIP PHONE
WITH DOUBLE SOFT LIMITATION
IL2533A
Description
IL2533AN, IL2533AD 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
РАВХ 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 mА (decreasing upto 5 mА
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
LS
01
28
RI
MFL
02
27
LI
RO
03
26
VSS
VDD
04
25
CS
AGND
05
24
M2
STB
06
23
M1
CI
07
22
LED
LO
08
21
FCI
LCC
09
20
R1
HS/DP
10
19
R2
OSC
11
18
R3
MODE
12
17
R4
C4
13
16
C1
C3
14
15
C2
package pin out
PACKAGE
IL2533AD assembly to 28-pin SO-package
MS-013AE.
IL2533AN assembly to 28-pin DIP-package
MS-011AB.
1
IL2533A
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.
R2
C1
La
SA1
VD1
R1
R15
VT2
L
b
R19
R17
VD5
R9
R14
C7
C5
R12
L1
C1
LS
R1
STB
C11
VD6
C6
AGND
LED
C8
VT4
R7
R8
CS
VT3
R10
Line current
reading
Adaptation to line
Power supply generating
Masking on direct current
R6
RO
R20
C9
Soft encrease
VD D
M2
M1
VSS
R4
VT1
Генератор тона
Tune generator
VD2
R11
C4
R3
Ring frequency
determination
Controlling logic
Sound
RAM switch
off
Keyboard controller
Clock
oscillator
C10
R21
R1
R2
R3
R4
R13
HS/DP
R5
VD3
LLC
MODE С1 С2 С3 С4
MFL
SA3
C2
LLC Hi
VD4
OSC
C3
R18 AGND
SA2
LLC Lo
R16
LLC Off
Keyboard
VD7
VD8
VD9
VD10
Figure 2 – Typical application flow-chat
2
IL2533A
Table 1 – Circuit pins description
Pin
No
01
Pin letter
symbol
LS
02
MFL
03
RO
04
VDD
05
06
AGND
STB
07
CI
08
MO
09
LLC
10
HS/DP
11
OSC
12
MODE
Function
Line current input.
Input for line current determination (responsibility setup)
MF level setup.
For DTMF level setup can be used potential divider, connected from this pin to
AGND and to VSS
Receipt output
Output for controlling of dynamic hearing aid with impedance from 140 to 300
Оhm
Positive supply voltage.
Supply voltage output for circuit
Analog ground, Analog ground for amplifiers
Balanced input side tone.
Input for side tone suppression
Entire impedance output.
For complex impedance, capacitor should be connected to this output
Melody output.
Melody generator PWM-output for tone ring.
When output not active, in ―Switch off‖ state
Line waste compensation.
Selected output for loss compensation in line.
LLC=AGND : 20-50 mА; LLC=VDD : 45-75 mА; LLC=VSS :no compensation
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
Oscillator input.
Input for ceramic resonator (3.5 МHz)
Input of mode denomination selection.
Mode output
Open
Row 1
Row 2
Row 3
Row 4
Row 5
Function
Interlocking number dialing
LD mode, 10 pulse/s, 33/66ms
LD mode, 10 pulse /s , 40/60ms
LD mode, 20 pulse /s , 16/33ms
LD mode, 20 pulse /s , 20/30ms
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
14
15
16
C4
C3
C2
C1
Keyboard line.
(see keyboard scheme at figure 3)
3
IL2533A
Table 1 continued
Pin
No
17
18
19
20
21
Pin letter
symbol
R4
R3
R2
R1
FCI
Function
Keyboard line.
(see keyboard scheme at figure 3)
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
M1
Microphone outputs
24
M2
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
VSS
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)
Indirect memory (two key)
Redialing
LNR key
Insert by LNR pause key
Pause key PS
Р/М key or МТ
Tone/Pulse key (Т/Р)
Temporary MF key ""
Automatic setup key (А – D)
Volumes keys (VOL, "-/+")
Volume reset by off-hook
Tone ring programming
Pause duration ―flash‖ R3
4
10
yes
yes
yes
yes
Р/М
yes
yes
yes
yes
yes
yes
600m
4
IL2533A
KEYBOARD CONNECTING
Keyboard connecting is shown at figure 3.
Key closed, RON MAX = 1 Ohm
Key opened, ROFF MIN = 1 Ohm
C1
C2
C3
C4
R1
P/M
1
2
3
R2
4
5
6
7
R3
8
9
0
*
R4
#
R1
R2
R3
LNR
VOL
+
-
A
B
C
D
RP
PS
T/P
M1
M2
M3
M4
MR
Figure 3 – Keyboard connecting
Power-up set up
On-chip voltage on preset circuit traces supply voltage V DD during receiver off-hook.
When VDD increase reaches level approximately 1.2 V, preset circuit empties RAM.
Direct current conditions
Typical operational range is from 13 to 100 mА. Operational range by lowered effectiveness
is from 5 to 13 mА (parallel operation). In operational range all functions are active.
By line currents lower than 13 mА 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 mА by following form:
VLS = VLI + ILINE  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 ZAC, Ohm, is determining according to
following form
ZAC = 33  Z1
5
IL2533A
(2) Z1 direct current value should be 30 Ohm for maintaining of correct characteristics on direct
current.
Reverse damping and suppressing of side current can be set up not depending of each other.
8
VL
S
(V)
6
VL
I
5
4
Variable signals
absence
3
2
1
0
10
20
30
40
Line current
60
70
80
90 (mА) 100
Figure 4 – Direct current characteristics. Dependence of potentials at LI and LS outputs from
line current
SPEECH CIRCUIT
Speech circuit consists of transmitting and receiving chains with double soft limitation, line
attenuation compensation and side current suppression.
TRANSMITTING
Amplification of transmitting chain is 37 dB for matched load line 600 Ohm from М1/М2 to LS
(see test circuit at figure 5). Microphone input is differential input with input resistance 20 kOhm.
Soft limitation circuit limits output voltage at LI to 2 VPEAK (see figure 5). Increase front
duration is 30mcs/6dB and decay front duration is 20mcs/6dB. When no-signal mode is active,
during dialing or after Р/М key pressing, amplification coefficient is reducing by more than 60 dB.
RECEIVING
Amplification coefficient of receiving circuit is 3 dB for 600 Ohm of line load (test circuit at
figure 5). Differential-mode signal RI and STB are receiving input. When no-signal mode is active
during dialing, amplification coefficient decreases for more than 60 dB. During DIMF dialing,
supporting tone is applied to the receiver. DIMF signal is supporting tone, with level lower than
minus 30 dB relative to line signal.
Pressing Volume key can change receiving amplification coefficient. VOL key gives raising
5.4 dB and has two-state function, i.e. repetitive key pressing sets up initial value of amplification
coefficient. As alternative can be used ―+/–― keys. ―+‖key increases coefficient by 8.1 dB in 3 levels,
and ―–― key decreases by 5.4 dB in 2 levels (general range 13.5 dB). Volume is set to initial value
by switch hook actuation.
Soft limitation circuit adjust voltage at receipt output (RO) no more than 1VPEAK (see figure 6)
6
IL2533A
It prevents from sharp distortion and acoustic impact.
SIDE TONE
Good side tone suppression can be reached by using of following equal
Z BAL
Z
 2
Z LINE Z1
(3).
Signal of side tone suppression is applied to STB input (see figure 8).
LINE ATTENUATION COMPENSATION
Line attenuation compensation is controlled by circuit output. When this mode is activated,
transmission and receipt coefficient is decreasing by 6 dB by line currents from 20 to 50 mА, when
LLC = AGND, and by currents from 45 to 75 mА, when LLC corresponds to high state (@R1=30
Ом). Line attenuation compensation become disconnected, when LLC corresponds to low state
(see figure 7).
7
1
G1
10n
1
2
3
47 кОм
100 мкФ
G8
1 мОм
100 кОм
КТ 660А
(КТ 3107 Б)
10 кОм
К1
мA
SW2
6 кОм
1 мкФ
SW4
15 нФ
3.58 МГц
К3
К2
SW3
10 мкФ
330 кОм
300 Ом
30 Ом
P2
SW1
VSS
CS
LI
RI
STB
LS
FCI
9
7
11
2
5
LLC
CI
OSC
MFL
AGND
10 HS/DP
26
25
27
6
28
1
21
C4
C3
C2
C1
R1
R2
R3
R4
VDD
LED
MO
4
22
8
12
15
16
20
19
18
17
13
14
3
23
M1
R0
24
M2
MODE
MULTI-STANDARD
SINGLE CHIP TELEPHONE
G4
SA2
G3
10 кОм
10 кОм
КТ 520
(КТ 3102Б)
V P1
10V
T1
G5
IL2533
B
G2
S1
2
600
Ом
RL
100 мкФ
A
КТ 521
(КТ3107Б)
1
2
3
4
5
6
7
К4
1 кОм
50 мкФ x10 В
SA1
V P4
10 нФ
10 нФ
P3
мA
К5
22 кОм
T2
150 Ом
G6
G7
“M2”
“M3”
“M4”
“T/P”
“C”
“B”
“A”
“PS”
“+”
“Vol”
“LNR”
“RP”
“R2”
“0”
“R1”
“9”
“8”
“6”
“2”
“#”
“5”
“1”
“4”
“P/M”
100 мкФ
“MR”
“M1”
“D”
“-”
“R3”
“*”
“7”
“3”
IL2533A
8
IL2533A
Figure 6 – Soft limitation and distortion by receipt
12
1,2
VRO
10
1,0
9
8
0,8
Line current 20 mА
Frequency 800 Hz
7
6
0,6
Distortion
Output voltage of receipt circuit (RO), V PEAK
AGC switching
5
Distortion
0,4
4
3
2
0,2
1
0
0
0,25
0,50
0,75
1,00
1,25
1,50
1,75
2,00
Input line voltage (LS), V
PEAK
Tx
(dB )
35
34
33
32
31
30
29
LLC = A GND
LLC = VDD
LLC = VSS
f = 800 Hz
ZLINE = 600 Ohm
VLS = -10 dBm
Current of line
20
30
40
50
60
70
80
(mA )
Typical characteristics and line attenuation compensation for transmitting circuit
Rx
(dB )
4
3
2
1
0
-1
-2
LLC = AGND
LLC = VDD
LLC = VSS
f = 800 Hz
ZLINE = 600 Ohm
VLS = -10 dBm
Current of line
20
30
40
50
60
70
80
(mA )
Typical characteristics and line attenuation compensation for receiving circuit
Figure 7 – Typical characteristics and line attenuation compensation
9
IL2533A
ZIN
Z1
ZBAL
Z2
Figure 8 – Side Tone Balance
DIALING FUNCTION
DIGITAL KEYS
Key scanning is allowed, when HS/DPN is set up as high and VDD is higher than VREF. A valid
key is detected from the keyboard by connecting the appropriate row to the column (RON < 1 кОм).
It can be done using keyboard matrix N x M with single contacts. Four diodes are used for lines
quantity extension (see keyboard connecting at figure 3.). Also it is possible to connect
microcontroller to lines and columns.
P/M KEY
Р/М key is used for entry into the program/no-signal state. Pressing Р/М key disconnects
speech circuit and device is set to program state. Repetitive pressing of P/M key disconnects nosignal mode and program state (function with two states).
When program/no-signal state is activated, light-emitting indication is connected (flash:
80ms ―ON‖ and 1s ―OFF.‖).
SELECTING OF DIALING MODE
Initial mode (LD or MF) can be chosen by output mode.
LD is default selection, time transfer to invoke by pressing T/P key or MF mode can be
invoke by pressing T/P key or "" key (when mode input = line 5, by first pressing of "" key, MF
tone generating). Circuit will revert to initial LD state after pressing of T/P key or after pressing of
R (R1, R2 or R3) key or after switch arm actuation.
When MF mode is selected by output mode, circuit can not be switched to LD and will stay in
MF mode.
AUTOMATIC SET UP KEY
Letter keys allow to use easily services of interconnections automatic setup. Keys А, В, С or
D are available only in MF mode (including temporal MF) and are not saved. Pressing of one of
these keys will invoke transferring of corresponding MF.
Automatic set up keys are not saved to RAM, but sequentially entered signs are
accumulated into FIFO buffer.
Redialing of the last number (LNR) – is a possibility, that allows to transfer repetitive last
hand-dialed number, without pressing the same keys. LNR can be repeated after every receiver
put up. Current RAM contents is overwritten by newly entered data.
Hand-entered number is automatically save to LNR RAM. RAM storage capacity is 31 digit.
If dialed number is larger than 31 digit, LNR possibility will be blocked (until new data will be less
than 31 digit) and further entered data will be buffered to FIFO.
By PS key pressing, pauses can be put out.
10
IL2533A
Digits, dialed later, i.e. digits entered by hand after LNR invocation, are not stored to RAM,
but buffered to FIFO.
REDIALING
The last hand-dialed number can be redial without lever pressing, with the help of RP key. If
dialed number is busy, than pressing of RP key interrupts line for 1.6 с (in order to pass to new
dialing) and after pause number will be repeated.
Redialing function is allowed, if number was dialed before pressing RP key. It can be called
unlimited times till next pressing of the lever. During 1.6-second interval, device is in lower energy
consumption mode for current saving.
REPEATED CALL FUNCTION
Repeated call activation (R1, R2 or R3 keys) will cause flash (with periodic intervals), at that
R1 flashes are never accomplished in LD mode. R2 and R3 will be implemented independently of
mode.
If repeated call is repeated record in digit line, it will be stored into LNR RAM, when digit
(digits) are entered after repeated call.
If redial key is pressed after entering of digit line into FIFO buffer with sequentially entered
digit.
If redial key pressing does not accompanying by digits entering, LNR RAM stays untouched.
After number redialing, pause with duration 270 ms will be accomplished.
Keys from М1 to М12 are keys of direct memory access, and MR key is used for abbreviated
dialing.
Table 2
Memory structure
Number storing
Keys of direct memory access
Indirect memory
Quantity of numbers or keys
14
4
10
Numbers can be stored to on-chip RAM. Every number can contain upto 21 digit (including
pauses).
During programming several pauses can be entered by PS or LNR keys pressing. Every
pause, inserted within first 5 entries will be automatically limited after 2 seconds, while pauses,
inserted after position 5 in the digit line will stop dialing that can be continued after PS or LNR keys
pressing. ―Stop‖ function allows dialing in PABX extension.
Example – 45678–123 is stored in М1, where "–" is pause/waiting, and 123 is extension
number:
1) Lift up the receiver. Wait for tone signal;
2) Press М1 (45678 will be dialed);
3) Wait for tone signal from called РАВХ;
4) Press PS or LNR (123 will be dialed).
Dialing from the memory is cascade. However, one memory cell contents shall be dialed
before new one can be invoked.
РАВХ – PAX with outcoming and incoming communication.
11
IL2533A
FLOATING MARKER METHOD
In order to accomplish simple LNR dialing after connection with Automatic telephone system
Protocol of floating marker is used. If new entry coincides with contained in RAM, LNR key
pressing will cause automatic dialing of rest digits.
If there is inequality in coincidence, than LNR blocked till next lever pressing, and RAM will
contain new number.
Example – (LNR912345 contents, where 9 is access code):
1) Lift up the receiver, wait for Automatic telephone system dial tone;
2) press 9 and wait for outer dial tone;
3) Press LNR (12345 will be dialed).
TONE OSCILLATOR
Tone oscillator includes DTMF tones, three main frequencies for tone ring and quieting
DTMF tones. DTMF oscillator provides 8 frequencies, namely:
Lower Group:
Sig
1 - 2 - 3 697 Hz
ns
А
Sig
4 - 5 - 6 770 Hz
ns
В
Sig
7 - 8 - 9 852 Hz
ns
С
Sig
*-0-#-D
941 Hz
ns
Upper Group
Sig
1-4-7-*
1209 Hz
ns
Sig
2-5-8-0
1336 Hz
ns
Sig
3-6-9-#
1477 Hz
ns
Sig
А–В-С–
1633 Hz
ns
D
The output level of MF can be set by means of the external divider to the pin MFL.
(ZLINE =
Voltage at Pin MFL (2)
1.50 В (AGND)
1.27 B
1.15 B
1.03 B
0.90 B
0.70 B
0.54 B
0.42 B
0.30 B
0.18 B
0.00 B (VSS)
600 Оhm)
DTMF Level (Lower Group)
-4.0 dBm
-5.2 dBm
-6.4 dBm
-7.6 dBm
-8.8 dBm
-10.0 dBm
-11.2 dBm
-12.4 dBm
-13.6 dBm
-14.8 dBm
-16.0 dBm
12
IL2533A
The preliminary distortion constitutes 2.6 dB. MF tones comply with the recommendations of CEPT.
Tone Ring (MELODY / LOUDNESS)
The three main parts for the melodies are as follows: F1 = 800 Hz, F2 = 1067 Hz and F3 =
1333 Hz (± 5 %).
Frequency of repetition and loudness of the tone melody rings can be programmed by
pressing Р/М and #, indicated with a sign in compliance with Table 4.
Table 4
SIG FREQUENCY OF REPETITION
N
1
1 time (50 msec pause)
2
1 time (50 msec pause)
3
1 time (50 msec pause)
4
4 times
5
4 times
6
4 times (by default)
7
10 times
8
10 times
9
10 times
0
None
LOUDNESS
-16 dB
- 7 dB
0 dB (max)
-16 dB
- 7 dB
0 dB (max)
-16 dB
- 7 dB
0 dB (max)
OFF
The procedure is completed by the repetitious pressing of the key Р/М.
The default setting complies with the figure 6, i.e. after the supply ON preset the device will be
started with the repetition rate of 4 and the maximum loudness. If the sign 0 is programmed, then
the tone ring will be disabled until the next receiver lift, when it is set for the last preset value,
previous to zero. The programmed preset values are stored in RAM on the chip.
The repetition frequency signifies, that the sequence from 6 frequencies is repeated 1.4 or
10 times during 1 sec.
The frequency sequence is controlled by means of the sequence register as follows:
Sequence F1 F2 F3 F1 F2 F3 .....
QUIETING TONE
During the MF dialing the number the DIMF tones are applied to the phone speaker as a
comforting tone.
In the course of programming entry of the keys is indicated by means of the quieting tone of
1477 Hz. The quieting tone level constitutes approximately 60 mB at the output of RO. Duration
constitutes 40 msec. After each key pressing in the program mode.
When the program mode is terminated with the key Р/М, the identification tone is applied of
140 msec. An erroneous key pressing shall cause termination of the program mode, indicated by
the denial tone 4 times of 40 msec with the pauses of 28 msec between the tone enablings.
13
IL2533A
IDENTIFICATION OF THE RING FREQUENCY
The ring frequency identification block assumes, that only the signals with the frequencies
between 13 and 70 Hz shall be considered as the real ringing signals. The real ringing signal
identification time constitutes 1/f sec, where f is equal to the ring frequency.
When the real ringing signal is continuously available during 73 msec, the melody generator
is activated and remains active as long as the ring signal is available.
As soon as the melody generator is started, the ring signal is continuously monitored, and
the melody generator is enabled or disabled instantly in compliance with the short time availability
of the correct or erroneous ring signal appropriately (until the next supply enabling or hanging up
the recever).
하
하
Громкость
26dB
+
0 dB
80 k
Комфорт.
Comfor
тон
t tone
10dB
+
+
8k
STB
SC
RO
Z LINE
RI
DTMF
ZBAL
(10 x ZLINE)
300 Ом
30 Ом
LI
Компенсация
потерь в линии
ZREF
Line lose compensation
+
20 k
ZSYN
(970 Ом)
CS
12dB
+
Отключ.
23dB
+
Offзвука
sound
CI
20 k
M1
M2
32.3 x Z REF
Figure 9 – Speech circuit model by the alternating current
14
IL2533A
LEGEND
STATUSES
INPUTS
No
operation
(receiver put, no
ring)
PROCESSING
Receiver
up
lift-
Receiver putup
Speech mode
Forced
break (sec)
Number
dialing (LD
or MF)
Key pressing
Cut-off from
outsiders
Saving
(storing
RAM)
Number entry
Programming
Entry in
compliance
with text
Erroneous
program entry
in
Processing
in
compliance
with text
Read-out
from
memory
Incorrect entry
Status
compliance
text
in
with
Figure 10 – Symbols
15
IL2533A
16
IL2533A
Figure 11 – Ring tone programming
17
IL2533A
Figure 12 – Time MF
18
IL2533A
Entry of the keys, different from the procedure, shall be
ignored. Exit of the program mode from each status with
the receiver put-up or by the key Р/М
Program status
Speech circuit off
LED enabling
Any incorrectly
entered
key
shall cause exit
from
the
program status
Melody
generator
enabling
Entries (0 - 9, *, PS or LNR, R1, R2, R3)
shall be stored directly into the selected
position in memory
Figure 13 – Storing numbers
19
IL2533A
Complex impedance (270 Оhm + 750 Оhm // 150 nF)
Figure 14 – Automatic number dialing
20
IL2533A
Those components are included only, which are required for representing the complete
functions of the microcircuits.
The external components can be altered for compliance with the requirements of the various
national standards and for matching the various converters.
As a microcircuit is a component, but not a complete system, it cannot be applied as
a separately positioned individual element on the standard basis. Consequently, the
complete compliance with any standards depends upon application, where a microcircuit
is used, and therefore selection of the standard application is the responsibility
prerequisite of the Customer, and the manufacturer does not check the device for
compliance with the concrete standards.
1 Line adaptation.
Power selection.
D. C. masking.
2 Line current read-out.
3 Soft limitation of the automatic gain control.
4 Melody sequence setting block.
5 Ring frequency limitation.
6 Control logic.
7 Current generator.
8 Oscilloscope.
9 RAM. Melody.
Automatic number dialer.
10 Keyboard.
МЕТHOD OF OPERATION
PRINCIPLES OF OPERATION
Methods of the microcircuit potentialities application are optimized in such a way, so as:
- to comply with the expectations of the user;
- to be easy for training and upgradation;
- not to cause any automatic functions, which are not expected by the user
- to protect the user from making the critical errors, i.е. from dialing incorrect numbers,
deletion of the stored numbers, etc.;
- to be matching, simple and convenient in operation.
Молчание
Маскирование
HS/DP
tIDP
tPDP
tB
tM
tB
tM
tIDP
tPDP
tB
tM
Figure 15 – Time chart of the number dialing
21
IL2533A
MUTE
MASK
HS/DPN
tIDP
tPDP
tB
tM
tB
tM
tAP
tIDP
tPDP
tB
tM
Figure 16 – Time chart of the LD number dialing with the access pause
MUTE
MASK
HS/DPN
TONE
tIDP
tIDP
tAP
tIDP
Figure 17 – Time chart of the MF number dialing
MUTE
MASK
HS/DPN
tM
tFD
tM
tPFP
tM
tFD
tM
Figure 18 – Flashing time chart
22
IL2533A
Figure 19 – Time chart of the number redialing
Table 5 – ELECTRIC CHARACTERISTICS
( VDD = (4.5 ± 0.5) V; ILINE = 15 mA; f = 800 Hz; Та = (–25; +70) °С, if otherwise not stated below)
Description of Parameter,
Unit of Measurement
Consumption current, mА
Storage current, mcА
Parameter
Letter
Identification
IDD1
IDD2
IDD3
IDD4
IDDO
Norm
Mode
Speech mode
1)
MF dialing
2)
LD dialing . VDD=2.5 V
Ring mode. VDD=2.5 V
Standby mode.
VDD = 2 V; Ta = 25 °C
Not less
Not more
–
5
8.0
0.4
0.6
0.1
1.5
1.5
1.5
4.0
4.0
–
5.0
35.1
-0.8
38.1
0.8
–
4)
1.6VPEAK
15
22.5
15
15
2
2.4VPEAK
25
37.5
25
25
Remark
–
Low level output current, mА
by output CS
by output HS/DP
by output MO
by output LED
Line voltage (by preset default value), V
Transfer gain coefficient, dB
Alteration of gain coefficient depending on
frequency, dB
Distortion coefficient, %
Soft limitation level, V
Soft limitation overload, dB
Input signal rise time, mcsec/6dB
Input signal fall time, msec/6dB
Input impedance, kОhm,
By inputs М1, М2
Attenuation during silence, dB
Output noise voltage, dBm
Input voltage range, V, by inputs М1, М2
IOL(CS)
VOL = 0.4 V
IOL(HS/DP)
IOL(MO)
IOL(LED)
VLI
13 mА  IL  100 mА
Transfer (TX)
ATX
М1, М2 relative to LI
М1, М2 relative to LI.
ATX/F
f = (500 – 3400) Hz
3)
THD1
VLI  0.25VRMS
VAGC1
Speech mode
ASCO
–
tATTACK
–
tDECAY
–
ZIN
AMUTE
VNO1
VIN MAX1
Silence mode
Та = 25 °C
Differential
Single-sided
60
–
–
- 72
0.75VPEAK 1.25VPEAK
0.375VPEAK 0.625VPEAK
–
23
IL2533A
Table 5 Continued
Parameter
Letter
Mode
Identification
Output Driver (BJT)
Input voltage range, V, by input LI
VIN MAX2
–
Dynamic range, V
VTX
–
Reflection attenuation, dB
RL
ZRL = 1000 Оhm,
Та = 25 °C
Attenuation alteration from temperature,
–
ZAC/ТЕМР
Оhm/°С
Reception (RX)
Reception gain coefficient (by default), dB
ARX0
LI relative to RO
Loudness gain coefficient, dB
AVOL1
Key VOL
Loudness gain coefficient, dB
AVOL2
(-/+) keys
Alteration of the gain coefficient from the
f from 500 to 3400 Hz
ARX/F
input frequency, dB
Distortion coefficient, %
ТНD2
Speech mode.
VRI  0.25 VRMS
Soft limitation level, V
VAGC2
Speech mode
Soft limitation overload, dB
ASCO
Speech mode
Input signal rise time, mcsec/6dB
tATTACK
VRI  0.8 VRMS
Input signal fall time, msec/6dB
tDECAY
–
5)
Noise output voltage, dBm
VNO2
Speech mode.
Та = 25 °C
Undesirable frequency components, dBm
VUFC
from 50 to 20 kHz
Input impedance, kOhm, by input RI
ZIN RI
Speech mode
Input voltage range, V, by input RI
VIN RI
Speech mode
Side tone suppresion, dB
AST
VRI  0.25 VRMS
Input voltage range, V, by input STB
VINST
Speech mode
Input impedance, kOhm, by input STB
ZIN STB
Speech mode
6)
DTMF Mode
Frequency deviation, %
F
MF tone level (lower group), dB
VMF1
MFL = AGND
VMF2
MFL = VSS
Fore-distortion from the low level to high
–
VL-H
level, dB
Undesirable frequency components, dBm
VUFC1
f from 300 Hz to 5 kHz
MFL = VSS
VUFC2
f from 5 to 14 kHz
VUFC3
f from14 to 28.5 kHz
VUFC4
f from 28.5 to 40 kHz
Tone duration, msec
tTD
Mode: line 6 or 7
Intertone pause, msec
tITP1
Mode:line 6
tITP2
Mode: line 7
Tone rise time, msec
tTR
Tone fall time, msec
tTF
Keyboard
Wobble elimination time, msec
td
Input HS/DP
Wobble elimination during transfer from low
tHS-L
Receiver lift-up
status to high status, msec
Wobble elimination during transfer from
tHS-H1
No LD number dialing
high status to low status, msec
`LD mode
Number dialing rate, pulse/sec
tDR1
Mode: line 1, 2 or 5
tDR2
Mode: line 3 or 4
Pulse duration, msec
t/B1
Mode: line 2
t/B2
Mode: line 4
t/B3
Mode: line 1 or 5
t/B4
Mode: line 3
Description of Parameter,
Unit of Measurement
Norm
Remark
min
max
-2VPEAK
1.5VPEAK
18
2VPEAK
2.5VPEAK
–
0.375
0.675
1.5
4.4
7.1
-1.5
4.5
6.4
9.1
1.5
–
2
0.8VPEAK
–
22.5
15
–
1.2VPEAK
10
37.5
25
-72
7.5
–2VPEAK
26
–2VPEAK
75
-60
8.5
2VPEAK
–
2VPEAK
85
–
-2.5
-14.5
1.8
1.2
-5.5
-17.5
3.0
1
–
–
2
80
80
150
–
-40
-50
-70
-80
85
85
170
5
13.5
16.5
13.5
16.5
200
220
9.53
19.05
57
28.5
63
31.5
10.5
21
63
31.5
69
34.5
3, 4
3
3, 4
5
–
Table 5 Continued
24
IL2533A
Parameter
Norm
Letter
Mode
Remark
min
max
Identification
tHS-H2
In progress of LD number dialing
260
280
Duration of interpulse pause, msec
tM1
Mode: line 2
38
42
tM2
Mode: line 4
19
21
tM3
Mode: line 1 or 5
31.5
34.5
tM4
Mode: line 3
15.7
17.3
Fore-digit pause, msec
tPDP
LD dialing. Alternately buttons 2,
31.5
38.5
1 are pressed
Internal sign pause, msec
tIDP
Mode: line 1, 2, 3, 4 or 5
800
880
Flash duration, msec
tFD1
Key R1
100
102
tFD2
Key R2
270
300
tFD3
Key R3
600
650
Duration of entry pause, msec
tAP
–
2.0
2.12
6
Time of repeat line interruption, sec
tRP
LD dialing.
1.5
1.7
–
RP button pressing
Tone Ring
Melody output, V
VMO
Ring mode
–
–
Melody delay, мс
tMO
–
10
Ring frequency, Hz
f1
760
840
f2
1015
1120
f3
1260
1400
Call signal detection time, msec
tDT
–
150
Minimum detectable frequency, Hz
fMIN
Ring mode
–
13
–
Maximum detectable frequency, Hz
fMAX
70
–
–
Quieting Tone. Program Mode
Tone frequency, Hz
fPT
Programming mode, key entry
1400
1550
Voltage level at output RO, mV
VRT
Programming mode
55
65
Pulse duration while pressing a key, msec
tRTD-E
Key value entry
35
–
Confirmation pulse duration, msec
tRTD-A
Limited by the key Р/М
105
175
Deviation pulse duration, msec
tRTD-R
Incorrect key entry in the
140
180
7
program mode
–
Light Diode Output
LED enabling time, msec
tLED-ON
Programming mode
80
–
Interval, sec
tLED-OFF
1
–
Comfort Tone (DIMF)
Voltage level at output RO relative to the
VCT
–
-30
voltage level at input LS, dB
Notes
1 It does not enable the frequency deviation of the ceramic resonator
2 Relative to the high group
3 Values are valid at the time of the automatic number dialing and have the minimum value at the time of the manual
number dialing, i.е. the tones will last as long as the key is pressed
4 At the time of the temporary MF mode
5 Rise time is the time from reaching 10% of the final value till the tone amplitude gets 90% of its final value
6 Pauses, entered within the limits of the first 5 entries of the sign chain, shall be automatically limited after 2 sec.
Pauses, entered after position 5, can be limited manually only by pressing the key PS or LNR
7 Incorrect entry of a key in the program mode shall cause the tone sequence with 4 packs of tones of 40 msec and
the pauses between the packs of 28 msec and the forced exit from the program mode
Description of Parameter,
Unit of Measurement
1)
MF dialing – frequency number dialing
LD dialing – pulse number dialing
3)
VRMS – functioning voltage of the sinusoidal signal
4)
VPEAK – peak (amplitude span) voltage of the sinusoidal signal
5)
dBm – voltage value, determined by formula
1 dBm = 20 lg V / 0.775 V
(4)
where V – voltage, V
6)
DTMF – dual frequency number dialing ( particular case of the frequency dialing)
2)
25
IL2533A
Table 6 – Limit Permissible and Limit Modes of Microcircuit Operation
Limit
Mode
Parameter
Letter
Identification
Description of Mode Parameter,
Unit of Measurement
Supply voltage, V
Low level input voltage, V
High level input voltage, V
Input voltage by pin LS, В
Permissible
Norm
VDD
VIL
VIH
VI
Norm
min
4.0
0
0.7VDD
–
max
5.0
0.3VDD
VDD
–
–
–
3.58
–
By pin LI, CS
By pin STB, RI
By pin MO
Input current, mA
Frequency, MHz
Storage temperature, °С
Limit Mode
II
F
TSTG
2,5
min
-0.3
-0.3
0.7VDD
-0.3
-0.3
-2.0
-0.3
-25
–
-65
max
7.0
0.3VDD
VDD+0.3
1.0
8.0
VDD+0.3
35.0
25
3.58
125
10
Soft limitation
9
2,0
8
7
Current of line 20 mA
Frequency 800Hz
1,5
Distortion, %
Output voltage of line (LS), VPEAK
VLS
6
5
Distortion
1,0
4
3
0,5
2
1
0
0
25
50
75
100
125
150
Output voltage (microphone inputs M1,M2), мVPEAK
Figure 20 – Soft limitation and distortion during transfer
26
IL2533A
N SUFFIX PLASTIC DIP
(MS - 001AB)
Dimension, mm
A
15
28
B
1
14
Symbol
MIN
MAX
A
35.1
39.7
B
12.32
14.73
C
F
6.35
D
0.36
0.56
F
0.77
1.78
L
C
G
2.54
H
15.24
-T- SEATING
PLANE
N
G
K
M
H
D
J
J
0
10
K
2.92
5.08
L
15.24
15.87
M
0.2
0.38
N
0.38
0.25 (0.010) M T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
D SUFFIX SOIC
(MS - 059AD)
Dimension, mm
A
28
Symbol
MIN
MAX
A
17.7
18.5
B
8.23
8.9
C
2.35
3.05
D
0.35
0.5
F
0.4
1.27
15
B
H
1
P
14
G
R x 45
C
-TK
D
SEATING
PLANE
0.25 (0.010) M T C M
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B ‑ 0.25 mm (0.010) per side.
J
F
G
1.27
H
11.43
M
J
0
8
K
0.05
0.35
M
0.14
0.32
P
11.5
12.7
R
0.25
0.75
27