Datasheet M-982-02T, M-982-02P, M-982-02S Datasheet (CLARE)

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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 low­power CMOS techniques to provide the complete fil­tering 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 inte­grated 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-con­trolled time base guarantees accuracy and repeatabil­ity.

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 power­down (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 150°C

Operating Ambient Temperature -40 to 85°C

V

DD

7V

Input Voltage on SIGIN VSS- 6.5 to VDD+ 0.3V

Input Voltages (except SIGIN) VSS- 0.3 to VDD+ 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 opera­tional sections of this data sheet is not implied. Exposure of
the device to the absolute maximum ratings for an extend­ed 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

)--20ms
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

)- -10ms

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 VDD-0.5 - V -

DET n pins I

OZ

VO=VDD, V

SS

-1µA

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 µA
currents VDD = 2.7V 4 20 µA

/Xrange = VSS - 2 6 µA

PD =VDD - 4 10 µA

M-982-02

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3

Rev. 4

Call Progress Tones

Frequency (HZ) Use

12

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 - kΩ
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, VDD- VSS= 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 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 VDDor 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 VSSand 620
Hz detect when open, or connected to VDD.

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 sys­tems.

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 Tri­State Timing Diagram on page 5 for a diagram of a cir­cuit 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 interrup­tion rate). This information, coupled with level and fre­quency 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 inter­ruption 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 encoun­tered. Ringback may be provided at ringing voltage fre­quency (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 measure­ment 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

Tolerances (mm) SAE

approximation(inches)

Min Max Min Max

A 2.35 2.65 .0926 .1043

A1 .10 .30 .0040 .0118

b .33 .51 .013 .020

D 12.60 13.00 .4961 .5118

E 7.4 7.6 .2914 .2992

e 1.27 BSC .050 BSC

H 10.00 10.65 .394 .419

L .40 1.27 .016 .050

Tolerances (inches) Metric

Approximation (mm)

Min Nom Max Min Nom Max

A - - .210 - - 5.33

A1 .015 - - .38 - -

b .014 - .022 .36 - .56

b2 .045 .060 .065 1.1 1.5 1.7

C .009 - .015 .23 - .38

D 1.065 1.085 1.120 27.1 27.6 28.4

E .390 .415 .425 9.9 10.5 10.8

E1 .330 .360 .390 8.4 9.1 9.9

e .100 BSC 2.54 BSC

ec 0° 15° 15° 0° 15°

L .115 .130 .160 2.9 3.3 4.1

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6

M-982-02

Rev. 4

Package Dimensions

Dimensions

mm

(inches)

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the accuracy or completeness of the contents of this publication
and reserves the right to make changes to specifications and
product descriptions at any time without notice. Neither circuit
patent licenses nor indemnity are expressed or implied. Except as
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Inc. assumes no liability whatsoever, and disclaims any express or
implied warranty, relating to its products including, but not limit­ed to, the implied warranty of merchantability, fitness for a partic­ular purpose, or infringement of any intellectual property right.

The products described in this document are not designed,
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of Clare’s product may result in direct physical harm, injury, or
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Specification: DS-M982-02-R4
©Copyright 2001, Clare, Inc.
All rights reserved. Printed in USA.
7/24/01