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Part: M-980-02T
Category:
Communication
Description: 3v/5v General Purpose Call Progress Tone Detector
Company: Clare, Inc.
Datasheet: Download M-980-02T datasheet File size : 875 kB
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Datasheet text preview:
M-980-02
3V/5V General Purpose Call Progress Tone Detector
Features · 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 · Automatic dialers · Dialing modems · Traffic measurement equipment · Test equipment · Service evaluation · Billing systems Pin Diagram Description 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 M980-02 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 8pin 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.
Ordering Information Part # M-980-02P M-980-02S M-980-02T Description 8-pin plastic DIP 16-pin SOIC 16-pin SOIC, Tape and Reel
Block Diagram
DS-M980-02-R3
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1
M-980-02
Absolute Maximum Ratings
DC Supply Voltage (VDD - VSS) 6.0V Voltage on SIGNAL IN(VDD+ 0.5V) to (VSS-12V) Voltage on Any Pin Except SIGNAL IN (VDD + 0.5V) to VSS -0.5V Storage Temperature Range -65° to 150°C Operating Temperature -40°C to 85°C Lead Soldering Temperature 260° for 5 seconds
Note: Exceeding these ratings may permanently damage the M-980-02.
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 Supply Current Signal Detection Level (5V) Level (3V) Duration Level 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 -
Signal Rejection
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
Duration Logic 0 Logic 1 Logic 0 Logic 1
Deviation Resistance AC + DC level Impedance (500 Hz) 3V operation 5V operation
Unless otherwise noted, VDD - VSS = 2.8 to 5.5 V and Ta = 25°C Notes: 1. 0 dBm = 0.775 Vrms. 2. F = 315 to 640 Hz. 3. F > 1025 Hz, < 190 Hz. 4. Output current = 1 mA, VSS - VDD - 3.0V. 5. Input current - 10 mA max. 6. External clock. 7. Nominal = (VDD + VSS)/2. 8. Signal dropping from -38 to -65 dBm. 9. Signal dropping from -10 to -65 dBm.
Pin Description
Pin SIGIN DETECT ENABLE VDD VREF VSS XIN, XOUT Descriptions 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.
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Rev. 3
M-980-02
Signal Timing
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-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 M980-02, 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" 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 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&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.
Device Timing
Time tMD tID tB 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. 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.
Rev. 3
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