CML Semiconductor Products Call Progress Tone Detector FX633 D/633/3 March 1996 1.0 Features Provisional Issue • Worldwide Tone Compatibility • Wide Dynamic Signal Range • Single and Dual Tones Detected • Low Voltage Operation • Special US Busy-Detect Output • Standard 8-Pin DIP Package • Special Voice-Detect Output • Standard 3.58MHz Xtal 1.1 Brief Description The FX633 detects the audible tone signals used by most of the world's Telecom Systems to indicate Dial, Ringing, Busy and other conditions found when placing a call. Detection of these call progress stages is essential to the proper operation of automatic calling products. The FX633 adds new features to Call Progress monitoring. It detects and indicates separately the "US Busy" tones, reducing the need to measure "tone cadence" to identify "US Busy". It detects and separately indicates "Voice" and other signals from Call Progress tones, reducing voice-falsing and adding voice-answer as a connection prompt. The FX633 uses the latest signal processing techniques to provide these advantages. It is a low cost, low power product with superior performance. It is available in the industry standard package. 1996 Consumer Microcircuits Limited Call Progress Tone Detector FX633 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 ............................................................. 7 1.6 Application Notes .......................................................................................... 7 1.6.1 General............................................................................................ 7 1.7 Performance Specification ........................................................................... 8 1.7.1 Electrical Performance .................................................................... 8 1.7.2 Packaging...................................................................................... 12 1996 Consumer Microcircuits Limited 2 D/633/3 Call Progress Tone Detector 1.2 FX633 Block Diagram Figure 1 Block Diagram 1996 Consumer Microcircuits Limited 3 D/633/3 Call Progress Tone Detector 1.3 FX633 Signal List Package D4 Package P1 Pin No. Pin No. Name Type 2 1 XTAL/CLOCK I/P The input to the on-chip oscillator, for external Xtal circuit or clock. 3 2 XTALN O/P The inverted output of the on-chip oscillator. 5 3 ENABLE I/P A logic "0" pulse of at least 1µs applied to this input resets the decoder circuits and forces both DETECT1 and DETECT2 outputs to a logic "0". 7 4 DETECT1 O/P When a call progress signal is detected, this output goes to a logic "1". 10 5 SIGIN I/P Signal input. Signals to this pin should be ac coupled. The dc bias of this pin is set internally. 12 6 Vss Power 13 7 DETECT2 O/P Signal Description 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. 15 8 VDD NC 1, 4, 6, 8, 9, 11, 14, 16 Notes: I/P = O/P = 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. Input Output 1996 Consumer Microcircuits Limited 4 D/633/3 Call Progress Tone Detector 1.4 FX633 External Components Typical Values: R1 C1 C2 C3 C4 X1 1MΩ ± 10% 33pF ± 20% 33pF ± 20% 1nF ± 20% at 5V, 560pF ± 20% at 3.3V. 0.1µF ± 20% 3.579545MHz (refer to Section 1.7.1) Figure 2 Recommended External Components 1996 Consumer Microcircuits Limited 5 D/633/3 Call Progress Tone Detector 1.5 General Description 1.5.1 Overall Function Description FX633 The FX633 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 FX633, by contrast, uses a stochastic signal processing technique based on analysis in both the frequency and time domain, with signal amplitude forming a small 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 a profile more likely to match that of speech, noise or other non-callprogress signals. 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 FX633. 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 FX633 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 FX633 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. 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 FX633 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. No Signal: A signal falling outside the nominal range 120Hz to 900Hz 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. 1996 Consumer Microcircuits Limited 6 D/633/3 Call Progress Tone Detector 1.5.3 FX633 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 ½VDD. Signal Analyser The frequency range, quality and consistency of the input signal is analysed by this functional block. To be classified as a call progress signal the input signal frequencies should lie between 340Hz and 650Hz. 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. Xtal/Clock Oscillator If the on-chip Xtal oscillator is to be used, then external components X1, R1, C1 and C2 are required. If an external clock source is to be used, then it should be connected to the XTAL/CLOCK input pin and the XTALN pin should be left unconnected. 1.5.4 Decode Output Truth Table DETECT2 DETECT1 CONDITIONS 0 0 No Signal 0 1 Call Progress Low Band: Will detect 350+440, 400+450, 440+480, 400, 425, 440, and 450Hz tones 1 1 Call Progress High Band: Will detect 480+620, 600 and 620Hz tones 1 0 Non Call Progress signal, e.g. Voice Activity Note that DETECT1 responds to the whole range of call progress tones from 340Hz to 650Hz. 1.6 Application Notes 1.6.1 General On power-up, a logic "0" at the ENABLE input may be used to disable and initialise the device. 1996 Consumer Microcircuits Limited 7 D/633/3 Call Progress Tone Detector 1.7 Performance Specification 1.7.1 Electrical Performance FX633 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 P1 Package Total Allowable Power Dissipation at Tamb = 25°C ... Derating Storage Temperature Operating Temperature Min. Max. 800 13 +125 +85 Units mW mW/°C °C °C D4 Package Total Allowable Power Dissipation at Tamb = 25°C ... Derating Storage Temperature Operating Temperature Min. Max. 800 13 +125 +85 Units mW mW/°C °C °C Max. 5.5 3.59 Units V MHz 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 -55 -40 -55 -40 Operating Limits Correct operation of the device outside these limits is not implied. Notes Supply (VDD - VSS) Xtal Frequency 1996 Consumer Microcircuits Limited 8 Min. 3.0 3.57 D/633/3 Call Progress Tone Detector FX633 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 = - 40°C to +85°C. 0dB = 775mVrms. Notes DC Parameters IDD (ENABLE = "1") IDD (ENABLE = "1") (VDD = 5.0V) (VDD = 3.3V) AC Parameters SIGIN pin Input Impedance Minimum Input Signal Level Input Signal Dynamic Range Signal to Noise Ratio Xtal/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 = 120µA) Output Logic "0" Level (lOL = 360µA) Notes: 1. 2. 3. 4. 5. 6. Min. Typ. Max. Units 1 1 0.5 0.3 1.0 0.7 mA mA 2 3 3 0.35 -40 40 16 MΩ dB dB dB 4 4 40 40 10 20 ns ns MΩ dB 5 5 5 5 6 6 80% 20% +5.0 −5.0 10.0 90% 10% VDD VDD µA pF VDD VDD 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 and DETECT2 pins. 1996 Consumer Microcircuits Limited 9 D/633/3 Call Progress Tone Detector 1.7.1 FX633 Electrical Performance (continued) Figure 3 Timing Diagram: Call Progress Tone(s) Figure 4 Timing Diagram: Non Call Progress Signal 1996 Consumer Microcircuits Limited 10 D/633/3 Call Progress Tone Detector 1.7.1 FX633 Electrical Performance (continued) Figure 5 Timing Diagram: Call Progress Tone(s) to Non Call Progress Signal For the following conditions unless otherwise specified: Xtal Frequency = 3.579545MHz, VDD = 3.3V to 5.0V, Tamb = - 40°C to +85°C, S/N = 20dB. Notes Min. Typ. Max. Units 70 ms Signal Timings (ref. Figures 3, 4 and 5) tI Burst Length Ignored tL Burst Length Detected tGI Call Progress Tone Gap Length Ignored 7 tGD Call Progress Tone Gap Length Detected 7 tRP Call Progress Tone Response Time 145 ms tDRP Call Progress Tone De-response Time 145 ms tGDR Gap Detected Recorded 8 tNG Non Call Progress Signal Gap Length Ignored 9 tNRP Non Call Progress Signal Response Time tDNRP Non Call Progress signal De-response Time tCH State Change Notes: 7. 8. 9. 145 ms 20 40 ms 6 ms 80 145 ms ms 80 0 ms ms ms 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. 1996 Consumer Microcircuits Limited 11 D/633/3 Call Progress Tone Detector 1.7.2 FX633 Packaging Figure 6 P1 Mechanical Outline: Order as part no. FX633P1 Figure 7 D4 Mechanical Outline: Order as part no. FX633D4 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