M-984-02 Special Information
Tone Detector
•
•
Detects single-frequency tones used for error indica-
tion and call progress in telephone systems
Provides detection windows for:
400/425 Hz (Call Progress)
950 Hz (Special and error indication)
1400 Hz (Special and error indication)
1800 Hz (Special and error indication)
Separate tri-state outputs for each tone window
Inexpensive 3.58 MHz crystal time base
Auxiliary 3.58 MHz clock output
14-pin DIP package and 16-pin SOIC package
Single supply 3 to 5 volt (low power CMOS)
Wide dynamic range (30 dBm)
Applications include: automatic dialers, modems,
telecom test equipment, telephone traffic measure-
ment, service evaluation, billing equipment
In comparison with the earlier M-984, the M-984-02 has wider
acceptance bands for SIT tones to facilitate reception of
tape-loop tones, lower power consumption at 5V operation, 3V
operation, superior temperature performance, lower cost, and is
available in DIP, SOIC, and SOIC tape and reel versions.
Ordering Information
M-984-02P
14-pin plastic DIP
M-984-02S
16-pin plastic, SOIC
M-984-02T
16-pin SOIC, Tape and Reel
Figure 1 Pin Diagram
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•
•
•
•
•
•
The M-984-02 Special Information Tone Detector is a mono-
lithic integrated circuit designed to provide reliable detection of
many common telephone network status signals. In particular, it
detects the signals known as Special information Tones (SITs)
or error tones as defined by the CCITT, and single tones often
used as dial tone, audible ringing, and other general progress in-
dications. The M-984-02 uses CMOS switched capacitor filters
and a crystal time base to achieve the high stability and accu-
racy specified. Each tone detection window has an associated
output pin, which can be placed in a high impedance state for
use with time-share microcomputer bus applications.
Figure 2 Block Diagram
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00023, Rev. B
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 1
M-984-02
Table 1 Pin Functions
Pin
XIN
XOUT
Function
Crystal Connection — 3.58 MHz crystal across these pins will produce the timebase needed for proper operation of the M-984-02.
An external clock signal may be fed to XIN providing the clock signal has a duty cycle of 50
±
10% and comes within 0.2 volts of the
supply rails. XOUT remains unconnected when an external clock is used.
X358
A buffered output pin. A 3.58 MHz clock signal is available for use in other circuits as a timebase. Leave open when unused.
ENVLP The ENVLP pin is a common detection indicator for the four detect pins. Simply put, the ENVLP is a logical “OR” of the active detect
circuits for each of the four windows, though there is a delay provided to permit ENVLP to latch the first active detect pin. ENVLP is
not tri-state controlled.
V
SS
The power supply pins, V
DD
being the most positive. Commonly, V
DD
is at 3-5 volts, while V
SS
is at ground.
V
DD
SIGIN Analog signal input. (Internally capacitively coupled.)
V
REF
V
REF
is a bias voltage generated in the chip for use in external analog circuits, such as active filters and AC-coupled buffers. Leave
open when unused.
OE
The tri-state control pin. OE places the DET pins in the active mode when at logic “1”. When at logic “0,” OE causes the DET out-
puts to appear as high impedance. Should be tied to logic “1” when the M-984-02 is not used in a time-shared bus application.
D1800
D1400 The detect outputs associated with each window. Tri-state control is available through use of the OE pin.
D950 Timing is shown in Figure 4.
D400
Figure 3 Typical Application
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00023, Rev. B
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 2
M-984-02
Table 2 Specifications
Parameter
Operating Conditions V
DD
Power supply noise
Power
V
REF
Signal Detection
Current drain (I
DD
)
V
REF
Impedance
Frequency Range
Level: V
DD
= 5.0V
Level: V
DD
= 3.0V
Duration
Bridge Time
Signal to Noise Ratio
Signal Rejection
Frequency Range
Level: V
DD
= 5.0V
Level: V
DD
= 3.0V
Duration
Outputs
Except X358
Dn pins only
Inputs
EN pin
V
OL
V
OH
I
OZ
V
IL
V
IH
Pull-up and
Pull-down cur-
rents
MODE = V
SS
/XRANGE +V
SS
MODE2 = V
DD
PD = V
DD
SIGIN pin
Voltage range
Input
impedance
Input Spectrum
Clock
External clock
connected to
XIN pin
XIN, XOUT with
crystal ocs. ac-
tive
X358 pin
V
IL
V
IH
Duty cycle
Capacitance
Internal res.
V
OL
V
OH
Tri-state Operation
Duty cycle
t
EN
(High Z to Low Z)
Conditions
−
0.1 - 5 kHz
V
REF
open
−
−
−
−
Min
2.7
−
−
48% of V
DD
3.25
Note 1
-30 (24.5 mV)
-33 (17.4 mV)
85
50
−
16
Note 1
−
−
−
−
V
DD
-0.5
−
−
V
DD
-2.0
V
DD
- 0.5
12.5
4
2
12.5
12.5
4
-6.5
80
−
−
V
DD
- 0.2
40
−
20
−
V
DD
- 0.5
40
−
Max
5.5
20
15
52% of V
DD
8.25
Note 1
0 (775 mV)
-3 (173.5 mV)
−
−
15
−
Note 1
-40 (7.8 mV)
-43 (5.5 mV)
50
0.5
−
1
0.5
−
−
50
20
6
100
25
10
V
DD
−
28
0.2
−
60
10
−
0.5
−
60
250
dBm
dBm
ms
ms
ms
dB
dBm
dBm
ms
V
V
µA
V
V
V
µA
µA
µA
µA
µA
µA
V
kΩ
kHz
V
V
%
pF
MΩ
V
V
%
ns
ns
Units
V
mV p-p
mA
V
kΩ
−
f
c
= 400 Hz
f
c
= 950, 1400, 1800 Hz
−
−
−
−
−
−
I
SINK
= -1.0 mA
I
SOURCE
= 1.0 mA
V
O
= V
DD
, V
SS
−
V
DD
= 5V
V
DD
= 2.7V
V
DD
= 5V
V
DD
= 2.7V
−
V
DD
= 5V
V
DD
= 2.7V
−
−
f = 500 Hz
−
XOUT open
XOUT open
XOUT open
−
−
C
L
= 20 pF, I
SINK
= -1.0 mA
C
L
= 20 pF, I
SOURCE
= 1.0 mA
C
L
= 20 pF
C
L
= 50 pF
250
t
DE
(Low Z to High Z)
RL = 100 KΩ
−
Unless otherwise noted, specifications hold over V
DD
- V
SS
= 2.8V to 5.5V power supply, and T
OL
-40°C to +85°C.
Notes:
1. See Table 3 for detection/rejection frequencies.
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00023, Rev. B
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 3
M-984-02
Table 3 Detector Frequency Windows
Detector
D400
D950
D1400
D1800
Low Reject
363
835
1275
1656
Low Accept
392
885
1328
1722
High Accept
459
1016
1472
1854
High Reject
493
1070
1527
1924
Table 4 Absolute Maximum Ratings
DC Supply Voltage
Input Voltage on SIGIN
Input Voltage on Any Pin (except SIGIN)
Storage Temperature Range
Operating Temperature Range
Lead Soldering Temperature
Note:
Exceeding these ratings may permanently damage the device.
7V
V
SS
- 6.5V to V
DD
+0.3V
V
SS
- 0.3 to V
DD
+ 0.3V
-40°C to +150°C
-40°C to +85°C
260°C for 5 seconds
Figure 4 Timing Diagram
Figure 5 Tri-State Timing
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00023, Rev. B
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 4
M-984-02
A
A1
b
b
2
C
D
E
E1
e
e
c
L
Tolerances
(inches)
Metric (mm)
Min
Max
Min
Max
.210
5.33
.015
.38
.014
.022
.36
.56
.045
.070
1.1
1.8
.008
.014
.20
.36
.735
.775
18.7
19.7
.300
.325
7.6
8.3
.240
.280
6.1
7.1
.100 BSC
2.54 BSC
15°
0°
15°
0°
.115
.150
2.9
4.1
A
A1
b
D
E
e
H
L
Tolerances
(Inches)
Metric (mm)
Min
Max
Min
Max
.093
.104
2.35
2.65
.004
.012
.10
.30
.013
.020
.33
.51
.398
.413
10.10
10.50
.291
.299
7.4
7.6
.050 BSC
1.27 BSC
.394
.419
10.00
10.65
.016
.050
.40
1.27
Figure 5 Package Dimensions
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
40-406-00023, Rev. B
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
E-mail: info@teltone.com Internet: www.teltone.com
Page 5
