M-982-02
Precise Call Progress Tone Detector
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
Description
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.
Applications
•
Automatic dialers
•
Dialing modems
•
Traffic
•
Measurement equipment
•
Test equipment
•
Service evaluation
•
Billing systems
Pin Diagram
Ordering Information
Part #
Description
M-982-02P
M-982-02S
M-982-02T
22-pin plastic DIP
20-pin plastic SOIC
20-pin plastic SOIC,Tape and Reel
Block Diagram
DS-M982-02-R4
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1
M-982-02
Absolute Maximum Ratings
Storage Temperature
Operating Ambient Temperature
V
DD
Input Voltage on SIGIN
Input Voltages (except SIGIN)
Lead Soldering Temperature
-40 to 150°C
-40 to 85°C
7V
V
SS
- 6.5 to V
DD
+ 0.3V
V
SS
- 0.3 to V
DD
+ 0.3 V
260° C for 5 seconds
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.
Note:
Exceeding these ratings may permanently damage the M-982-02.
Specifications
Parameter
Operating
Conditions
Power
V
REF
Signal
Detection
V
DD
Power supply noise
Current drain (I
DD
)
V
REF
Impedance
Frequency range
Level: V
DD
= 5.0V
Conditions
-
0.1 - 5 kHz
V
REF
open
-
-
in-band signal
XRANGE = open
XRANGE = V
SS
Level: V
DD
= 3.0V
Duration (t
DD
)
Bridge time (t
BB
)
Level skew between adjacent
inband signals
High level to low level signal for
detection of both (t
IL
)
Time to output (t
DO
)
XRANGE = open
XRANGE = V
SS
-
-
Min
2.7
-
-
48% of V
DD
3.25
-1
-30
(24.5 mV)
-40
(7.8 mV)
-33 (17.4 mV)
-43 (5.5 mV)
200
-
-
1
-
-
-
-6
-
-
-
-
160
-
-
V
DD
-0.5
-
-
VDD - 2.0
VDD - 0.5
12.5
4
2
4
Max
5.5
20
15
52% of V
DD
8.25
+1
0
(775 mV)
-10
(245 mV)
-3 (549 mV)
-13 (173.5 mV)
-
20
6
-
200
240
10
-6
-50(2.5 mV)
-60 (0.8 mV)
-53 (1.7 mV)
-63 (.6 mV)
-
200
0.5
-
1
0.5
-
-
50
20
6
10
Units
V
mV p-p
mA
V
kW
% of f
o
dBm
dBm
-
dBm
dBm
ms
ms
dB
s
ms
ms
ms
% of f
o
dBm
dBm
dBm
dBm
ms
ms
V
V
µA
V
V
V
µA
µA
µA
µA
Rev. 4
Notes
-
-
-
1
Signal
Rejection
Outputs
Inputs
for detection of both
high = 0 dBm (775 mV)
low = -30 dBm (24.5 mV)
SIGIN
≈
-24 dBm
SIGIN < -24 dBm
Time from DET n to STROBE (t
DS
)
-
Frequency range
-
Level: V
DD
= 5.0V
XRANGE = open
XRANGE = V
SS
Level: V
DD
= 3.0V
XRANGE= open
XRANGE = V
SS
Interval duration (t
ID
)
-
Time to output (T
IO
)
-
DET n,
V
OL
I
SINK
= -1mA
STROBE pins
V
OH
I
SOURCE
=1mA
DET n pins
I
OZ
V
O
=V
DD
, V
SS
EN, OE, XRANGE,
VIL
-
MODE, PD pins
VIH
VDD = 5V
VDD = 2.7V
Pull-up and Pull-down MODE = VSS
VDD = 5V
currents
VDD = 2.7V
/Xrange = VSS
-
PD =VDD
-
-
-
1
-
-
2
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M-982-02
Specifications (continued)
Parameter
Voltage range
Input impedance
Input spectrum
External clock
VIL
connected to XIN pin
VIH
Duty cycle
XIN, XOUT with crystal Capacitance
osc. active
Internal resistance
Power up (TPU)
X358 pin
VOL
VOH
Duty cycle
CL = 50 pF,
RL = 100 kW
SIGIN pin
Conditions
-
f=500 Hz
-
XOUT open
XOUT open
XOUT open
-
-
PD hi to lo
CL = 20 pF,
ISINK = -1mA
CL = 20 pF,
ISOURCE =1mA
CL = 20 pF
-
-
Min
-6.5
80
-
-
VDD-0.2
40
-
20
-
-
Max
VDD
-
28
0.2
-
60
10
-
30
0.2
Units
V
kΩ
kHz
V
V
%
pF
MW
ms
V
Notes
Clock
Tri-state
Operation
tEN,(High Z to Low Z)
tDE,(Low Z to High )Z
VDD - 0.2
40
250
250
-
60
ns
ns
V
%
Unless otherwise noted, V
DD
- V
SS
= 5V, Ta = 25°C, 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
DET 1
DET 2
DET 3
DET 4
DET 5
EN
OE
SIGIN
STROBE
V
DD
V
REF
V
SS
X358
XIN
XOUT
XRANGE
MODE
Funtion
Active high tri-state output, detect for 350 Hz.
Active high tir-state ooutput, detect for 400/620 Hz.
(See Note.)
Active high tri-state output, detect for 440 Hz.
Active high tri-state output, detect for 480 Hz.
Active high tri-state output, detect for 425 Hz.
Active high enabled, when low drives STROBE low.
Active high input. When low tri-state DET n pins.
Analog signal input (internally capacitive coupled).
Active high output, indicates valid DET n.
Most positive power supply input pin.
Internally generated mid-power supply voltage
(output).
Most negative power supply input pin.
Buffered oscillator output (3.58 MHz).
Crystal oscillator or digital clock input.
Crystal oscillator output. Used only with a crystal.
Use X358 when clock output signal is required.
Active low input. Adds 10 dB of gain to input stage.
Compatibility selection. Connection to VSS selects
400 Hz detection. (M-981-02 emulation.) Connection
to V
DD
or no connection selects 620 Hz detection.
Power-down operation, logic high inhibits internal
clock. Internal pulldown resistor.
Call Progress Tones
Frequency (HZ)
1
350
400
440
440
440
480
480
350
620
941
425
2
440
Off
Off
480
620
Off
620
Off
Off
1209
Off
Dial Tone
Special
Alert Tone
Audible Ring
Pre-empt
Bell High Tone
Reorder (Bell Low)
Special
Special
DTMF “ ”
European
Use
*
PD
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
.
Rev. 4
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3
M-982-02
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.
Truth Table
Signal Present (fo)
350 Hz
400 Hz (Note)
620 Hz (Note)
440 Hz
480 Hz
425 Hz
Other (no detect)
Any
Any
Any
Any
Any
Mode
X
0
1/open
X
X
X
X
X
X
X
X
X
Det 1
1
X
X
X
X
X
0
0
0
Det 2
X
1
1
X
X
X
0
0
0
Det 3
Det 4
X
X
X
X
X
X
1
X
X
1
X
X
0
0
0
0
0
0
High Impedance
High Impedance
High Impedance
Det 5
X
X
X
X
X
1
0
0
0
Strobe
1
1
1
1
1
1
0
0
0
X
0
X
PD
0
0
0
0
0
0
0
1
0
0
0
1
OE
1
1
1
1
1
1
1
1
1
0
0
0
EN
1
1
1
1
1
1
1
X
0
1
0
X
4
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Rev. 4
M-982-02
Signal Timing
Tri-State Timing
Power-Down Timing
Typical Application
Rev. 4
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5
FPGA/CPLD
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