M-982-02 Precise Call Progress Tone Detector
•
•
•
•
•
•
•
•
•
•
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 include: automatic dialers, dialing mo-
dems, traffic measurement equipment, test equipment,
service evaluation, billing systems
Figure 1 Pin Diagram
Hz detector to support common international call progress re-
quirement.
The M-982-02 is also designed to replace the M-981-01 through
the use of the new MODE pin. With the MODE pin open or tied
to V
DD
, the M-982-02 operates in the M-982-01 compatible
mode. With the MODE pin tied to V
SS
, it operates in the
M-981-01 compatible mode.
Call Progress Tone Detection
Call progress tones are audible tones sent from switching sys-
tems to calling parties to show the status of calls. Calling parties
can identify the success of a call placed by what is heard after di-
aling. 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 Teltone M-982-02 is an integrated circuit precise tone de-
tector for special-purpose use in automatic following of switched
telephone calls. The circuit uses low-power 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 condi-
tions. In addition, a power-down (PD) feature is provided to fur-
ther reduce power consumption when inactive. It includes a 425
Figure 2 Block Diagram
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00022, Rev. A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 1
M-982-02
The Teltone 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 Figure 4 for a diagram of a circuit that could be used
to permit a microcomputer to directly monitor tones on the tele-
phone 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 indica-
Table 1 Pin Functions
Pin
DET 1
DET 2
Function
Figure 3 Signal Timing (See Table 3)
Active high tri-state output, detect for 350 Hz.
Active high tri-state output, 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-states 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 (out-
put)
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 V
SS
selects
400 Hz detection. (M-981-01 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
.
Figure 4 Tri-State Timing
Figure 5 Power-Down Timing
Table 2 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
X
X
X
1
X
X
0
0
0
High Impedance
High Impedance
High Impedance
DET 4
X
X
X
X
1
X
0
0
0
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
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00022, Rev. A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 2
M-982-02
Table 3 Specifications
Parameter
Operating V
DD
Conditions Power supply noise
Power
Current drain (I
DD
)
V
REF
Signal
Detection
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
)
Time from DET n to STROBE (t
DS
)
Signal
Rejection
Frequency range
Level: V
DD
= 5.0V
Level: V
DD
= 3.0V
Interval duration (t
ID
)
Time to output (T
IO
)
DET n,
STROBE pins
DET n pins
Inputs
XRANGE = open
XRANGE = V
SS
—
—
for detection of both
high = 0 dBm (775 mV)
low = -30 dBm (24.5 mV)
SIGIN
≥
-24 dBm
SIGIN
<
-24 dBm
—
—
XRANGE = open
XRANGE = V
SS
XRANGE= open
XRANGE = V
SS
—
—
I
SINK
= -1mA
I
SOURCE
=1mA
V
O
=V
DD
, V
SS
—
V
DD
= 5V
V
DD
= 2.7V
V
DD
= 5V
V
DD
= 2.7V
/Xrange = V
SS
PD = V
DD
SIGIN pin
Voltage range
Input impedance
Input spectrum
Clock
External clock connected
to XIN pin
XIN, XOUT with crystal
osc. active
X358 pin
V
IL
V
IH
Duty cycle
Capacitance
Internal resistance
Power up (T
PU
)
V
OL
V
OH
Duty cycle
—
—
—
f=500 Hz
—
XOUT open
XOUT open
XOUT open
—
—
PD hi to lo
C
L
= 20 pF,
I
SINK
= -1mA
C
L
= 20 pF,
I
SOURCE
= 1mA
C
L
= 20 pF
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
—
—
V
DD
- 2.0
V
DD
- 0.5
12.5
4
2
4
-6.5
80
—
—
V
DD
-0.2
40
—
20
—
—
V
DD
- 0.2
40
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
V
DD
—
28
0.2
—
60
10
—
30
0.2
—
60
Units
V
mV p-p
mA
V
KΩ
% of f
o
dBm
dBm
dBm
dBm
ms
ms
dB
s
ms
ms
µs
% of f
o
dBm
dBm
dBm
dBm
ms
ms
V
V
µA
V
V
V
µA
µA
µA
µA
V
KΩ
kHz
V
V
%
pF
MΩ
ms
V
V
%
1
1
Notes
Outputs
V
OL
V
OH
I
OZ
EN, OE, XRANGE, MODE, V
IL
PD pins
V
IH
Pull-up and Pull-down
currents
MODE = V
SS
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00022, Rev. A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 3
M-982-02
Table 3 Specifications (continued)
Tri-state
Operation
—
250
ns
t
EN
,(High Z to Low Z)
C
L
= 50 pF,
R
L
= 100 KΩ
—
250
ns
t
DE
,(Low Z to High )Z
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.
Table 4 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
Table 5 Absolute Maximum Ratings
-40 to 150°C
Storage Temperature
-40 to 85°C
Operating Ambient Temperature
7V
V
DD
V
SS
- 6.5 to V
DD
+ 0.3V
Input Voltage on SIGIN
V
SS
- 0.3 to V
DD
+ 0.3 V
Input Voltages (except SIGIN)
260° C for 5 seconds
Lead Soldering Temperature
Note:
Exceeding these ratings may permanently damage the
M-982-02.
Use
Dial Tone
Special
Alert Tone
Audible Ring
Pre-empt
Bell High Tone
Reorder (Bell Low)
Special
Special
DTMF “p”
European
Figure 6 Typical Application
tion from the M-982-02, can be used to decide what progress
tones have been encountered. For example, dial tones as
shown in Table 4 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 accu-
rately used. Examples include situations where ringback tone
may be short or not even encountered. Ringback may be pro-
vided at ringing voltage frequency (20 or 30 Hz) with some har-
monics and may not fall in the detect range, and speech or other
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00022, Rev. A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 4
M-982-02
A
A1
b
b
2
C
D
E
E1
e
e
c
L
Tolerances (inches)
Min
Nom
Max
.210
.015
.014
.022
.045
.060
.065
.009
.015
1.065 1.085 1.120
.390
.415
.425
.330
.360
.390
.100 BSC
15°
15°
0°
.115
.130
.160
Metric Approximation (mm)
Min
Nom
Max
5.33
.38
.36
.56
1.1
1.5
1.7
.23
.38
27.1
27.6
28.4
9.9
10.5
10.8
8.4
9.1
9.9
2.54 BSC
0°
15°
2.9
3.3
4.1
A
A1
b
D
E
e
H
L
Tolerances SAE approximation
(mm)
(inches)
Min Max
Min
Max
2.35 2.65
.0926
.1043
.10
.30
.0040
.0118
.33
.51
.013
.020
12.60 13.00 .4961
.5118
7.4
7.6
.2914
.2992
1.27 BSC
.050 BSC
10.00 10.65
.394
.419
.40
1.27
.016
.050
Figure 6 Package Dimensions
strong noise may obscure tones making cadence measurement
difficult.
Standards do exist and should be consulted for your particular
application. In North America AT&T’s “Notes on the Network” or
EIA’s RS-464 PBX standard should be reviewed. In Europe
tone plans may vary with locale, in which case the CEPT admin-
istration in each country must be consulted. Outside these ar-
eas, national PTT organizations can provide information on the
systems within their borders.
Ordering Information
M-982-02P
M-982-02S
M-982-02T
22-pin plastic DIP
20-pin plastic SOIC
20-pin plastic SOIC,Tape and Reel
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00022, Rev. A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 5
