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Электронный компонент: M-982-02

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DS-M982-02-R4
M-982-02
Precise Call Progress Tone Detector
1
Description
Features
Precise detection of call progress tones
Linear (analog) input
Digital (CMOS compatible), tri-state outputs
22-pin DIP and 20-pin SOIC
Single supply 3 to 5 volt (low power CMOS)
Inexpensive 3.58 MHz crystal time base
Wide dynamic range (30 dB)
Lower power consumption (power-down mode)
425 Hz detection
Applications
Automatic dialers
Dialing modems
Traffic
Measurement equipment
Test equipment
Service evaluation
Billing systems
The M-982-02 is an integrated circuit precise tone
detector for special-purpose use in automatic following
of switched telephone calls. The circuit uses low-
power CMOS techniques to provide the complete fil-
tering and control required for this function. The basic
timing of the M-982-02 is designed to permit operation
with almost any progress tone system.The use of inte-
grated circuit techniques allows the M-982-02 to pack
the five filters for call progress following into a single
22-pin DIP or 20-pin SOIC. A 3.58 MHz crystal-con-
trolled time base guarantees accuracy and repeatabil-
ity.
The M-982-02 is an enhanced drop-in replacement for
the M-982-01. It has a wider operating voltage range
(down to 3V). It has lower power consumption under
normal operating conditions. In addition, a power-
down (PD) feature is provided to further reduce power
consumption when inactive. It includes a 425 Hz
detector to support common international call progress
requirement.
Block Diagram
Ordering Information
Part #
Description
M-982-02P
22-pin plastic DIP
M-982-02S
20-pin plastic SOIC
M-982-02T
20-pin plastic SOIC,Tape and Reel
Pin Diagram
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2
M-982-02
Rev. 4
Absolute Maximum Ratings
Storage Temperature
-40 to 150C
Operating Ambient Temperature
-40 to 85C
V
DD
7V
Input Voltage on SIGIN
V
SS
- 6.5 to V
DD
+ 0.3V
Input Voltages (except SIGIN)
V
SS
- 0.3 to V
DD
+ 0.3 V
Lead Soldering Temperature
260 C for 5 seconds
Note: Exceeding these ratings may permanently damage the M-982-02.
Absolute Maximum Ratings are stress ratings. Stresses in
excess of these ratings can cause permanent damage to
the device. Functional operation of the device at these or
any other conditions beyond those indicated in the opera-
tional sections of this data sheet is not implied. Exposure of
the device to the absolute maximum ratings for an extend-
ed period may degrade the device and effect its reliability.
Specifications
Parameter
Conditions
Min
Max
Units
Notes
Operating V
DD
-
2.7
5.5
V
-
Conditions
Power supply noise
0.1 - 5 kHz
-
20
mV p-p
Power
Current drain (I
DD
)
V
REF
open
-
15
mA
-
V
REF
V
REF
-
48% of V
DD
52% of V
DD
V
-
Impedance
-
3.25
8.25
kW
Signal
Frequency range
in-band signal
-1
+1
% of f
o
1
Detection
Level: V
DD
= 5.0V
XRANGE = open
-30
0
dBm
(24.5 mV)
(775 mV)
XRANGE = V
SS
-40
-10
dBm
(7.8 mV)
(245 mV)
-
Level: V
DD
= 3.0V
XRANGE = open
-33 (17.4 mV)
-3 (549 mV)
dBm
XRANGE = V
SS
-43 (5.5 mV)
-13 (173.5 mV)
dBm
Duration (t
DD
)
-
200
-
ms
Bridge time (t
BB
)
-
-
20
ms
Level skew between adjacent
inband signals
for detection of both
-
6
dB
High level to low level signal for
high = 0 dBm (775 mV)
1
-
s
-
detection of both (t
IL
)
low = -30 dBm (24.5 mV)
Time to output (t
DO
)
SIGIN
-24 dBm
-
200
ms
SIGIN < -24 dBm
-
240
ms
-
Time from DET n to STROBE (t
DS
)
-
-
10
ms
Signal
Frequency range
-
-6
-6
% of f
o
1
Rejection
Level: V
DD
= 5.0V
XRANGE = open
-
-50(2.5 mV)
dBm
XRANGE = V
SS
-
-60 (0.8 mV)
dBm
Level: V
DD
= 3.0V
XRANGE= open
-
-53 (1.7 mV)
dBm
XRANGE = V
SS
-
-63 (.6 mV)
dBm
Interval duration (t
ID
)
-
160
-
ms
Time to output (T
IO
)
-
-
200
ms
Outputs
DET n,
V
OL
I
SINK
= -1mA
-
0.5
V
STROBE pins
V
OH
I
SOURCE
=1mA
V
DD
-0.5
-
V
-
DET n pins
I
OZ
V
O
=V
DD
, V
SS
-
1
A
Inputs
EN, OE, XRANGE,
VIL
-
-
0.5
V
-
MODE, PD pins
VIH
VDD = 5V
VDD - 2.0
-
V
VDD = 2.7V
VDD - 0.5
-
V
Pull-up and Pull-down
MODE = VSS
VDD = 5V
12.5
50
A
currents
VDD = 2.7V
4
20
A
/Xrange = VSS
-
2
6
A
PD =VDD
-
4
10
A
M-982-02
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3
Rev. 4
Call Progress Tones
Frequency (HZ)
Use
1
2
350
440
Dial Tone
400
Off
Special
440
Off
Alert Tone
440
480
Audible Ring
440
620
Pre-empt
480
Off
Bell High Tone
480
620
Reorder (Bell Low)
350
Off
Special
620
Off
Special
941
1209
DTMF "
*
"
425
Off
European
Specifications (continued)
Parameter
Conditions
Min
Max
Units
Notes
SIGIN pin
Voltage range
-
-6.5
VDD
V
Input impedance
f=500 Hz
80
-
k
Input spectrum
-
-
28
kHz
Clock
External clock
VIL
XOUT open
-
0.2
V
connected to XIN pin
VIH
XOUT open
VDD-0.2
-
V
Duty cycle
XOUT open
40
60
%
XIN, XOUT with crystal Capacitance
-
-
10
pF
osc. active
Internal resistance
-
20
-
MW
Power up (TPU)
PD hi to lo
-
30
ms
X358 pin
VOL
CL = 20 pF,
-
0.2
V
ISINK = -1mA
VOH
CL = 20 pF,
ISOURCE =1mA
VDD - 0.2
-
V
Duty cycle
CL = 20 pF
40
60
%
Tri-state
tEN,(High Z to Low Z)
CL = 50 pF,
-
250
ns
Operation
tDE,(Low Z to High )Z
RL = 100 kW
-
250
ns
Unless otherwise noted, V
DD
- V
SS
= 5V, Ta = 25C, PD at logical low state, and XRANGE at a logical high state.
Power levels are in dBm referenced to 600 ohm. DC voltages are referenced to V
SS
.
Notes:
1. Per tone.
Pin Functions
Pin
Funtion
DET 1
Active high tri-state output, detect for 350 Hz.
DET 2
Active high tir-state ooutput, detect for 400/620 Hz.
(See Note.)
DET 3
Active high tri-state output, detect for 440 Hz.
DET 4
Active high tri-state output, detect for 480 Hz.
DET 5
Active high tri-state output, detect for 425 Hz.
EN
Active high enabled, when low drives STROBE low.
OE
Active high input. When low tri-state DET n pins.
SIGIN
Analog signal input (internally capacitive coupled).
STROBE
Active high output, indicates valid DET n.
V
DD
Most positive power supply input pin.
V
REF
Internally generated mid-power supply voltage
(output).
V
SS
Most negative power supply input pin.
X358
Buffered oscillator output (3.58 MHz).
XIN
Crystal oscillator or digital clock input.
XOUT
Crystal oscillator output. Used only with a crystal.
Use X358 when clock output signal is required.
XRANGE
Active low input. Adds 10 dB of gain to input stage.
MODE
Compatibility selection. Connection to VSS selects
400 Hz detection. (M-981-02 emulation.) Connection
to V
DD
or no connection selects 620 Hz detection.
PD
Power-down operation, logic high inhibits internal
clock. Internal pulldown resistor.
Note: This output indicates 400 Hz detect when MODE is connected to V
SS
and 620
Hz detect when open, or connected to V
DD
.
Truth Table
Signal Present (fo)
Mode
Det 1
Det 2
Det 3
Det 4
Det 5
Strobe
PD
OE
EN
350 Hz
X
1
X
X
X
X
1
0
1
1
400 Hz (Note)
0
X
1
X
X
X
1
0
1
1
620 Hz (Note)
1/open
X
1
X
X
X
1
0
1
1
440 Hz
X
X
X
1
X
X
1
0
1
1
480 Hz
X
X
X
X
1
X
1
0
1
1
425 Hz
X
X
X
X
X
1
1
0
1
1
Other (no detect)
X
0
0
0
0
0
0
0
1
1
Any
X
0
0
0
0
0
0
1
1
X
Any
X
0
0
0
0
0
0
0
1
0
Any
X
High Impedance
X
0
0
1
Any
X
High Impedance
0
0
0
0
Any
X
High Impedance
X
1
0
X
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4
M-982-02
Rev. 4
Call Progress Tone Detection
Call progress tones are audible tones sent from
switching systems to calling parties to show the status
of calls. Calling parties can identify the success of a
call placed by what is heard after dialing. The type of
tone used and its timing vary from system to system,
and though intended for human ears these signals can
provide valuable information for automated calling sys-
tems.
The M-982-02 contains five signal detectors sensitive
to the frequencies often used for these progress tones.
Electronic equipment monitoring the DET n outputs of
the M-982-02 can determine the nature of signals
present by measuring their duty cycle. See the Tri-
State Timing Diagram on page 5 for a diagram of a cir-
cuit that could be used to permit a microcomputer to
directly monitor tones on the telephone line. Much of
the character of the progress tones is in their duty
cycle or cadence (sometimes referred to as interrup-
tion rate). This information, coupled with level and fre-
quency indication from the M-982-02, can be used to
decide what progress tones have been encountered.
For example,dial tones as shown in the Call Progress
Tone tabel on page 3 are usually "on" continuously and
last until the first dial digit is received by the switching
system. Line Busy, on the other hand, is turned off and
on at a rate of 1 Hz with a a 50% duty cycle, or an inter-
ruption rate of 60 times per minute (60 IPM). The tones
can be distinguished in this way. It should be noted that
while such techniques will usually be effective, there
are some circumstances in which the M-982-02 cannot
be accurately used. Examples include situations
where ringback tone may be short or not even encoun-
tered. Ringback may be provided at ringing voltage fre-
quency (20 or 30 Hz) with some harmonics and may
not fall in the detect range, and speech or other strong
noise may obscure tones making cadence measure-
ment difficult.
Standards do exist and should be consulted for your
particular application. In North America AT&Ts "Notes
on the Network" or EIAs RS-464 PBX standard should
be reviewed. In Europe tone plans may vary with
locale, in which case the CEPT administration in each
country must be consulted. Outside these areas,
national PTT organizations can provide information on
the systems within their borders.
M-982-02
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5
Rev. 4
Signal Timing
Tri-State Timing
Power-Down Timing
Typical Application