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CML Semiconductor Products
Call Progress Tone Detector
1.0 Features Worldwide Application Single Tone Decoding Dual Tone Decoding US-Busy Tones Identified Special Information Tones Identified
FX643
D/643/4 March 1996 Provisional Issue
* * * * *
* * * * *
Voice Detected Wide Dynamic Signal Range Low Working Voltage Standard 3.58MHz Clock Input Standard 8-pin DIP and 16-pin SOIC Packages
1.1
Brief Description
The FX643 decodes the audible tone signals provided by Telecom Systems Worldwide to indicate Dial, Ringing, Busy, Unobtainable and other stages of a call attempt. Detection of these signals is essential to applications involving machine dialling or automatic call placement. The FX643 provides the key features needed for intelligent full-function Call Progress monitoring. In addition to detecting the full range of standard Call Progress tones, the FX643 adds single and dual tone decoding for better cross-system Call Progress monitoring. The FX643 also directly identifies the "US Busy" tones, and the international Special Information Tones, saving the time needed for "cadence verification" under Busy and Unobtainable conditions. The FX643 will also decode and indicate speech, or other Non-Call Progress signals: this reduces voice-falsing of Call Progress tones and adds Voice-Answer as a "connected" prompt. The FX643 uses new digital signal processing techniques to provide these advantages. It is a low cost, low power product with superior performance. It is available in industry standard 8-pin and 16-pin packages.
(c) 1996 Consumer Microcircuits Limited
Call Progress Tone Detector
FX643
CONTENTS Section Page
1.0 Features......................................................................................................1 1.1 Brief Description ........................................................................................1 1.2 Block Diagram............................................................................................3 1.3 Signal List ..................................................................................................4 1.4 External Components ................................................................................5 1.5 General Description ...................................................................................6 1.5.1 Overall Function Description .........................................................6 1.5.2 Glossary.......................................................................................6 1.5.3 Block Diagram Description............................................................7 1.5.4 Decode Output Truth Table ..........................................................8 1.6 Application Notes ......................................................................................8 1.6.1 General ........................................................................................8 1.7 Performance Specification ........................................................................9 1.7.1 Electrical Performance..................................................................9 1.7.2 Packaging ..................................................................................14
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.2
Block Diagram
Note: XTALN for 16-pin SOIC (D4) package only.
Figure 1 Block Diagram
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.3
Signal List
Package D4 Pin No. 2
Package P1 Pin No. 1
Signal
Description
Name XTAL/CLOCK
Type I/P The external clock input to the clock divider circuit. Also, the input to the on-chip oscillator, for external Xtal circuit (D4 package only). The inverted output of the on-chip oscillator (D4 package only). When a single tone within the range of the Call Progress Band or Non Call Progress Band, or a Special Information Tone, is detected, this output goes to a logic "1". A logic "0" pulse of at least 1s applied to this input resets the decoder circuits and forces DETECT1, DETECT2 and DETECT3 outputs to a logic "0". When a call progress signal is detected, this output goes to a logic "1". Signal input. Signals to this pin should be ac coupled. The dc bias of this pin is set internally. The negative supply rail (ground). This output is used in conjunction with DETECT1. When DETECT1 is at a logic "1", this output goes to a logic "1" if a Call Progress High Band signal is detected. When DETECT1 is at a logic "0", this output goes to a logic "1" if a Non Call Progress signal is detected.
3
-
XTALN
O/P
4
2
DETECT3
O/P
5
3
ENABLE
I/P
7 10 12 13
4 5 6 7
DETECT1 SIGIN Vss DETECT2
O/P I/P Power O/P
15
8
VDD
Power
The positive supply rail. This pin should be decoupled to VSS by a capacitor. Internal connection. Do not make any connection to these pins.
1, 6, 8, 9, 11, 14, 16
-
NC
Notes: I/P = O/P =
Input Output
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.4
External Components
Typical Values: C1 1nF 20% at 5V, 560pF 20% at 3.3V C2 0.1F 20% (For details of clock frequency, refer to Section 1.7.1) C3, C4 33pF 20% R1 1M 10% X1 3.579545MHz (Refer to Section 1.7.1)
Figure 2 Recommended External Components
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.5
1.5.1
General Description
Overall Function Description The FX643 Call Progress Tone Detector uses different tone detection methods from those commonly found with other products. Many traditional devices use a bandpass filter followed by an energy detector. The filter is usually designed to pass input signals with a frequency between about 300Hz and 700Hz, and the amplitudes of signals in this range are then checked against a level threshold. Any signal of acceptable level in this frequency band is classed as a Call Progress tone, including signals due to speech and noise. False outputs caused by speech are a common feature with these products, and background noise may lead to a stuck "detect" output. The FX643, by contrast, uses a stochastic signal processing technique based on analysis in both the frequency and time domain, with signal amplitude forming a minor part in the decision process. This analysis includes checks on whether the signal has a "profile" which matches international standards for Call Progress tones or Special Information Tones, or a profile more likely to match that of speech, noise or other non-call-progress signals. It checks on whether the signal is a single tone. It also adds checks on whether tones which include frequencies corresponding with the "US Busy" signals have been detected. The following Glossary, and the Decode Truth Table in section 1.5.4, provide a simple explanation of the decoding functions and features offered by the FX643.
1.5.2
Glossary Call Progress Tones: The single and dual frequency tones in the range 350Hz to 620Hz specified widely for call progress signalling. Call Progress Band: The nominal range 340Hz to 650Hz within which the FX643 will detect Call Progress tones. The detection algorithm requires that the tones have the characteristics typical of Call Progress Tones. Call Progress Low Band: The nominal range 340Hz to 490Hz. The FX643 will detect single or dual tones falling entirely within this range as Call Progress Low Band tones. Call Progress High Band: The nominal range 600Hz to 650Hz. Single tones in this range, or dual tones having a material frequency component within this range (e.g. 480 + 620Hz), are detected as Call Progress High Band tones. Special Information Tone: The nominal frequencies 950Hz or 1400Hz or 1800Hz. Non Call Progress Signal: A signal falling within the nominal range (a) 200Hz to 800Hz, but NOT within the Call Progress Band, or (b) within the nominal range 200Hz to 800Hz, but NOT meeting the DETECTION REQUIREMENTS when the signal falls in the Call Progress Band. Subject to the duration and other characteristics of such signals, the FX643 will usually interpret these as a Non Call Progress Signal (e.g. speech or other signal activity). Minimum Input Signal: The minimum signal level for the specified tone decoding performance. The lower level at which absence of an input signal will be registered is not specified.
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
No Signal: A signal falling outside the nominal range 120Hz to 900Hz or Special Information Tone or the absence of an input signal. Either will be detected as a No Signal condition. Nominal: Subject to dynamic tolerances within the signal analysis process. Absolute values are not material or adverse to performance.
1.5.3
Block Diagram Description (reference Figure 1) Slicer The input signal to the slicer is amplified by a self-biased inverting amplifier. The dc bias of this input is internally set at 1/2VDD. Signal Analyser The frequency range, quality and consistency of the input signal is analysed by this functional block. The signal to noise ratio must be 16dB or greater. The signal must be consistent over a period of about 140 ms. These decode criteria are continuously monitored and the assessment is updated every 7 ms, reference Figure 3. The analyser samples the call progress signal at 9.3kHz; so care should be taken to avoid high frequency signals (e.g. 18kHz) aliasing into the call progress band. Control Logic This block categorises the nature of the signal into various decoded output states and controls the two output pins. See the Decode Output Truth Table in section 1.5.4. Clock An external clock source is to be connected to the XTAL/CLOCK input pin. Alternatively, the internal oscillator may be used with an external crystal if the 16-pin SOIC (D4) version of the FX643 is used.
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.5.4
Decode Output Truth Table
DETECT3
DETECT2
DETECT1
CONDITIONS
0
0
0
No Signal
1
0
0
Special Information Tone: Will detect 950, 1400 and 1800Hz tones Call Progress Low Band: Will detect 350+440, 400+450 and 440+480Hz tones, for example Call Progress Low Band: Will detect single 400, 425, 440, and 450Hz tones, for example Call Progress High Band: Will detect 480+620Hz tones, for example
0
0
1
1
0
1
0
1
1
1
1
1
Call Progress High Band: Will detect single 600 and 620Hz tones, for example
0
1
0
Non Call Progress signal, e.g. Voice Activity
1
1
0
Will detect a single tone lying outside the Call Progress Band and within the Non Call Progress signal range
Note that: DETECT1 responds to the whole range of call progress signals from 340Hz to 650Hz DETECT2 responds to higher frequency call progress signals and voice or similar activity DETECT3 responds to and indicates the presence of a single tone
1.6
1.6.1
Application Notes
General On power-up, a logic "0" at the ENABLE input may be used to disable and initialise the device.
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.7
1.7.1
Performance Specification
Electrical Performance
Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the device. Min. -0.3 -0.3 -30 -20 Max. 7.0 VDD + 0.3 +30 +20 Units V V mA mA
Supply (VDD - VSS) Voltage on any pin to VSS Current into or out of VDD and VSS pins Current into or out of any other pin
P1 and D4 Packages Total Allowable Power Dissipation at Tamb = 25C ... Derating Storage Temperature Operating Temperature
Min.
-55 -40
Max. 800 13 +125 +85
Units mW mW/C C C
Operating Limits Correct operation of the device outside these limits is not implied. Notes Supply (VDD - VSS) Xtal Frequency Min. 3.0 3.57 Max. 5.5 3.59 Units V MHz
(c) 1996 Consumer Microcircuits Limited
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FX643
Operating Characteristics For the following conditions unless otherwise specified: Xtal Frequency = 3.579545MHz, S/N = 16 dB, Noise Bandwidth = 5 kHz, VDD = 3.3V to 5.0V, Tamb = - 40C to +85C. 0dB = 775mVrms. Notes DC Parameters IDD (ENABLE = "1") IDD (ENABLE = "1") (VDD = 5.0V) (VDD = 3.3V) 1 1 Min. Typ. 0.5 0.3 Max. 1.0 0.7 Units mA mA
AC Parameters SIGIN pin Input Impedance (at 100Hz) Minimum Input Signal Level Input Signal Dynamic Range Signal to Noise Ratio Clock Input 'High' Pulse Width 'Low' Pulse Width Input Impedance (at 100Hz) Gain (I/P = 1mV rms at 100Hz) Logic Interface Input Logic "1" Level Input Logic "0" Level Input Leakage Current (Vin = 0 to VDD) Input Capacitance Output Logic "1" Level (lOH = 120A) Output Logic "0" Level (lOL = 360A)
2 3 3
0.35 -40 40 16
M dB dB dB
4 4
40 40 10 20
ns ns M dB
5 5 5 5 6 6
80% 5.0 10.0 90% 10% 20% +5.0
VDD VDD A pF VDD VDD
Notes:
1. 2. 3. 4. 5. 6.
Not including any current drawn from the device pins by external circuitry. Small signal impedance over the frequency range 100Hz to 2000Hz and at 5.0V. The input level is not critical as the detector uses a stochastic algorithm. Timing for an external input to the XTAL/CLOCK pin. ENABLE pin. DETECT1, DETECT2 and DETECT3 pins.
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.7.1
Electrical Performance (continued)
Figure 3 Timing Diagram: Call Progress Tone(s)
Note 1:
DETECT3 is "1" only when the Call Progress Signal, or a Non Call Progress Signal, is a single frequency tone.
Figure 4 Timing Diagram: Non Call Progress Signal
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
1.7.1
Electrical Performance (continued)
Figure 5 Timing Diagram: Call Progress Tone(s) to Non Call Progress Signal
Note 1:
DETECT3 is "1" only when the Call Progress Signal, or a Non Call Progress Signal, is a single frequency tone.
Figure 6 Timing Diagram: Special Information Tones
(c) 1996 Consumer Microcircuits Limited
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Call Progress Tone Detector
FX643
For the following conditions unless otherwise specified: Xtal Frequency = 3.579545MHz, VDD = 3.3V to 5.0V, Tamb = - 40C to +85C, S/N = 20dB. Notes Signal Timings (ref. Figures 3, 4, 5 and 6) tI tL tGI tGD tRP tDRP tGDR tNG tNRP tNDRP tCH Burst Length Ignored Burst Length Detected Call Progress Tone Gap Length Ignored Call Progress Tone Gap Length Detected Call Progress Tone Response Time Call Progress Tone De-response Time Gap Detected Recorded Non Call Progress Signal Gap Length Ignored Non Call Progress Signal Response Time Non Call Progress signal De-response Time State Change 0 10 10 7,10,11 7,10 10 10 8,10 9 145 80 6 80 40 145 145 145 20 70 ms ms ms ms ms ms ms ms ms ms ms Min. Typ. Max. Units
Notes:
7. 8. 9. 10. 11.
Only applies to bursts of the same frequency. To acknowledge a short tone gap 40 ms, No Signal is indicated for a minimum of 6ms. If the gap > 90 ms, a No Signal state will be decoded. Timings also apply to Special Information Tone. Special Information Tone Gap Length Ignored is 15ms maximum.
(c) 1996 Consumer Microcircuits Limited
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D/643/4
Call Progress Tone Detector
FX643
1.7.2
Packaging
Figure 7 P1 Mechanical Outline: Order as part no. FX643P1
Figure 8 D4 Mechanical Outline: Order as part no. FX643D4
Handling precautions: This product includes input protection, however, precautions should be taken to prevent device damage from electro-static discharge. CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent licences are implied. CML reserves the right at any time without notice to change the said circuitry and this product specification. CML has a policy of testing every product shipped using calibrated test equipment to ensure compliance with this product specification. Specific testing of all circuit parameters is not necessarily performed.
CONSUMER MICROCIRCUITS LIMITED
1 WHEATON ROAD WITHAM - ESSEX CM8 3TD - ENGLAND Telephone: Telefax: +44 1376 513833 +44 1376 518247

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