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M-980-02 3V/5V General Purpose Call Progress Tone Detector
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Covers the 315 to 640 Hz range (common call progress) Sensitivity to -38 dBm Dynamic range over 38 dB 40 ms minimum detect 8-pin DIP or 16-pin SOIC Single supply CMOS (low power) Supply range 2.8 to 5.5 VDC Inexpensive 3.58 MHz time base Low power consumption (15 mW at 3V) Applications include: automatic dialers, dialing modems, traffic measurement equipment, test equipment, service evaluation, billing systems Figure 1 Pin Diagram
The M-980-02 is an integrated circuit tone detector for general 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-980-02 is designed to permit operation with almost any progress tone system. The use of integrated circuit techniques allows the M-980-02 to pack the complete frequency and amplitude portion of call progress following into a single 8-pin DIP or 16-pin SOIC. A 3.58 MHz crystal-controlled time base guarantees accuracy and repeatability. 3V/5V operation increases customer flexibility, improves reliability, and minimizes power consumption. 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 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 M-980-02 is a signal detector sensitive to the frequencies most often used for these progress tones. Electronic equipment monitoring the DETECT output of the M-980-02 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 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-980-02, can be used to decide what progress tones have been encountered. Table 5 shows some call progress tones with on/off times; 0.25/0.25 being 250 ms on, 250 ms off on a repeating basis. For example, dial tones as shown in the table are usually "on" con-
Figure 2 Block Diagram
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M-980-02
Table 1 Pin Descriptions
PIN SIGIN DETECT ENABLE VDD VREF VSS XIN, XOUT Description Signal input, AC or DC coupled (see level limitations elsewhere). Active output indicating signal detection. Activated by ENABLE. Enables DETECT output. Used to mask signal activity. Most positive power supply pin. Internally generated reference voltage. (VSS + VDD) /2 volts. Most negative power supply pin. Crystal attachment pins. XIN may be used as the input for an external 3.58 MHz clock.
Figure 3 Signal Timing (See Table 2) tinuously 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 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-980-02 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. Detection of "answer" is most difficult for many reasons. One way to determine if a called party has answered is by looking for a short burst of DETECT indications without a cadence match (produced by a click and "hello" at the far end). Some applications will require special methods like speech detection, but most can be reliably handled with the M-980-02 and simple cadence measurement. As can be seen, the tones used for the same purposes in different systems may not be the same. 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 administration in each country must be consulted. Outside these areas, national PTT organizations can provide information on the systems within their borders. Ordering Information M-980-02P M-980-02S M-980-02T 8-pin plastic DIP 16-pin SOIC 16-pin SOIC, Tape and Reel
Table 2 Device Timing
Time tMD tID Value 40 ms 40 ms @ -38 dBm 85 ms @ -10 dBm 18 ms Significance A valid tone will always be detected if it is at least 40 ms long. Inter-tone gaps must be detected if greater than this duration.
tB Drop-outs of valid tone of up to 18 ms will be ignored. Note: Application or removal of high level signals outside the must detect range may cause momentary detection, which may be filtered by time guarding the output.
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M-980-02
Table 3 Absolute Maximum Ratings
DC Supply Voltage (VDD - VSS) Voltage on SIGNAL IN Voltage on Any Pin Except SIGNAL IN Storage Temperature Range Operating Temperature Lead Soldering Temperature Note: Exceeding these ratings may permanently damage the M-980-02. 6.0V (VDD + 0.5V) to (VSS -12V) (VDD + 0.5V) to VSS -0.5V -65 to 150C -40C to 85C 260 for 5 seconds
Table 4 Specifications
Parameter Supply Current Signal Detection Level (5V) Level (3V) Duration Signal Rejection Level Inband (5V) Inband (3V) Outband Quiet Interval Detect "Detect" Output Pin "Enable", "XIN" Input Pin "XIN" Duty Cycle "XOUT" Loading "VREF" Output Pin "SIGIN" Input Pin Power Consumption Deviation Resistance AC + DC level Impedance (500 Hz) 3V operation 5V operation Duration Logic 0 Logic 1 Logic 0 Logic 1 Min - -38 -40 40 - - - 40 85 - VDD - 0.5 VSS VDD - 0.2 40 - -2 3.25 VSS - 5V 80 - - Max 5 0 0 - -50 -55 0 - - 0.5 - VSS + 0.2 VDD 60 10 +2 6.75 VDD - 15 25 Units mA dBm dBm ms dBm dBm dBm ms ms V V V V % pF % k V k mW mW Notes 101,2 - - 1,2 - 1,3 8 9 4 4 5 5 6 - 7 - - - - -
Unless otherwise noted, VDD - VSS = 2.8 to 5.5 V and Ta = 25C Notes: 1. 0 dBm = 0.775 Vrms. 6. External clock. 2. F = 315 to 640 Hz. 7. Nominal = (VDD + VSS)/2. 3. F > 1025 Hz, < 190 Hz. 8. Signal dropping from -38 to -65 dBm. 4. Output current = 1 mA, VSS - VDD - 3.0V. 9. Signal dropping from -10 to -65 dBm. 5. Input current - 10 A max. 10. Typical supply current 4 mA.
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M-980-02
Table 5 Call Progress Tones
Frequency 1 350 425 600 400 480 600 480 600 440 500 440 Frequency 2 +440 -- X 120 -- +620 X 120 +620 X 120 + 480 X 40 On/Off Continuous Use Dial tones
0.5/0.5s 0.25/0.25s 2.0/4.0s 0.5s burst
Line Busy Tones Reorder Tones Audible Ringing Various
Figure 4 Telephone Line Circuit Application
Figure 5 Detect Range
Figure 6 Input Signal Configuration
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M-980-02
A A1 b b2 C D E E1 e ec 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 .355 .400 9.02 10.16 .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 .0926 .1043 2.35 2.65 .0040 .0118 .10 .30 .013 .020 .33 .51 .3977 .4133 10.10 10.50 .2914 .2992 7.4 7.6 .050 BSC 1.27 BSC .394 .419 10.00 10.65 .016 .050 .40 1.27
Figure 7 Package Dimensions
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Worldwide Sales Offices
CLARE LOCATIONS
Clare Headquarters 78 Cherry Hill Drive Beverly, MA 01915 Tel: 1-978-524-6700 Fax: 1-978-524-4900 Toll Free: 1-800-27-CLARE Clare Micronix Division 145 Columbia Aliso Viejo, CA 92656-1490 Tel: 1-949-831-4622 Fax: 1-949-831-4628
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Clare cannot assume responsibility for use of any circuitry other then circuitry entirely embodied in this Clare product. No circuit patent licenses nor indemnity are expressed or implied. Clare reserves the right to change the specification and circuitry, without notice at an y time. The products described in this document are not intended for use in medical implantation or other direct life support applications where malfunction may result in direct physical harm, injury or death to a person.
Specification: 40-406-00018, Rev. B (c) Copyright 2000, CP Clare Corporation d/b/a Clare All rights reserved. Printed in USA. 07/28/00

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