IL9270N
DTMF signal receiver
(analog HM9270)
IC IL9270N is (DTMF) signal two-channel receiver-decoder (code 2 from 8).IÑ is fabricated
on CÌÎS technology and containes bandpass filters on switched capacitors. IC checks
length of incoming twochannel signal dispatches and pauses between them. Information
output as 4-digit binary code.IC clocking is carried out from quartz(-crystal) resonator with
frequency Fc= 3,579545 ÌHz.
MAIN CHARACTERISTICS
demodulates all 16 standard DTMF signals
Low consumed capacitance: 15 mW
One power source: 5 V+-5%
quarts generator with frequency 3,58 mHz is used
three state outputs
probability of mistaken decoding is 1/10000
Package - plastic 18-connection DIP (type 2104.18-À)
APPLICATION
* Àutomatic Òelephone Station
* call alert paging
* remote control systems
* credit card systems
* button telephone systems
* answering mashine
* domestic auto systems
Arrangement and purpose of outputs
Pin
01
02
03
04
05,06
07,08
09
10
11·14
15
16
17
18
Symbol
IN+
IN-
CS
Vref
NC
OSC1,2
GND
TOE
Q1-Q4
StD
ESt
St/GT
Vcc
Purpose
non inverting input ÎA
inverting input ÎA
operational amplifier outputÎA)
reference voltage output (Vcc/2)
unconnected
tact input/output.
general
input of output inable
three state data output
control outputèÿ
output of early control
control input/output
power +5 V
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax:
+375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
IL9270N
block-scheme
High
Group
Filter
Two-tone
input
filter
Amplifier
Digital
detector
Code
transformer
Output
cascascade
IN+
Q1
Q2
Q3
Q4
IN-
CS
High
Group
Filter
Offset
voltage
Amplifier
Reference
voltage
OSC1
T ct
a
Generator
OSC2
Reference
voltage
generator
Control
Logic
Vcc
Gnd
Vref
St/Gt
Est
StD
TOE
Reference table of received DTMF signal and code under formation
low group
frequency,
Hz
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
high group
frequency,
Hz
1209
1336
1477
1209
1336
1477
1209
1336
1477
1209
1336
1477
1633
1633
1633
1633
code under formation
Q4
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
Q3
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
IÑ IL9270 connection scheme
Q2
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
Q1
1
0
1
1
1
0
1
0
1
0
1
0
1
0
1
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax:
+375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
IL9270N
DC ELECTRICAL CHARACTERISTICS(V
CC
= 5 V
±
5%, T
A
= +25° C)
Symbol
Parameter
Test Conditions
Guaranteed Limits
Min
V
CC
I
CC
I
SO
I
OL
I
OH
V
TSt
R
IN
V
REF
A
VOL
R
OR
Supply Voltage
Supply Current
Maximum Pull Up (Source)
Current
Minimum Output-Low (Sink)
Current
Minimum Output-High
(Source) Current
Steering Threshold Voltage
Input Impedance (Signal
Inputs 1,2)
Output Voltage
DC Open Loop Voltage Gain
Output Resistance
Parameter
Guaranteed Limits
Min
SIGNAL CONDITION
Valid Input Signal
Level (each tone of composite
signal)
Freq. Deviation Accept Limit
Freq. Deviation Reject Limit
Third Tone Tolerance
Dial Tone Tolerance
Symbol
Parameter
18
±3.5
-16
22
Guaranteed
Limits
Notes
MIN
MAX
883
±1.5
27.5
mV
RMS
m V
RMS
%
%
dB
Typ
Max
@ 1 KHz
No Load
OE = 0 V
V
OUT
=0.4 V
V
OUT
=4.6 V
0.8
0.35
2.2
8
2.4
65
10
Unit
2.8
2.5
4.75
3.0
Typ
Max
5.25
9.0
24
V
mA
µA
mA
mA
V
MΩ
V
dB
kΩ
Notes
Unit
AC ELECTRICAL CHARACTERISTICS (V
CC
= 5.0 V, T
A
=+25° C, F
CLK
= 3.579545 MHz)
TIMING REQUIREMENTS (V
CC
= 5.0 V, T
A
= +25°C, F
CLK
= 3.579545 Mhz)
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax:
+375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
IL9270N
Min
t
DP
t
DA
t
REC
t
REC
t
ID
t
DO
Tone Present Detection Time
Tone Absent Detection Time
Maximum Tone Duration Accept
Minimum Tone Duration Reject
Acceptable Interdigit Pause
Rejectable Interdigit Pause
20
20
40
5
0.5
Max
14
8.5
40
Unit
ms
ms
ms
ms
ms
ms
Refer to
“Guard Time
Adjustment
(User
Adjustable)
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax:
+375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
IL9270N
Time diagram
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax:
+375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
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