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cml microcircuits communication semiconductors cmx683 call progress and "voic e" detector ? 2002 cml microsystems plc d/683/1 june 2002 advance information features applications detects single and dual call progress tones worldwide payphone systems worldwide call progress tone compatibility telephone redialling systems "voice" detect outputs (fast and slow) dialling mo dems wide dynamic range with low falsing banking and billing systems low power operation: 600a at 3.0v typ. telecom test equipment 3.58mhz xtal/clock oscillator telecom security systems 1. brief description the cmx683 is a general purpose call progress tone detector for use in monitoring the progress of calls in public switched telephone system (pstn) applications. dial tone, ringing, busy and not available states can be distinguished by using the host c to qualify the cadence of the cp detect output. the cmx683 uses advanced digital techniques to characterise valid call progress tones, unwanted tones, line noise and voice or music signals. in contrast to call progress detection devices based on simpl e filtering techniques, the cmx683 offers excellent sensitivity coupled with low false detection rates. the response time of the cmx683 allows it to operate with almost any call progress system. in particular the ?stuttered dial tone? of voice mail messa ging systems is supported. the use of statistical processing techniques, which analyse signal frequency, duration and amplitude, enable the cmx683 to distinguish voice or music activity from dtmf or call progress signals. separate outputs integrate the " voice" activity over both shorter and longer periods, enabling payphone and other billing systems to commence charging when a line connection has been established. a single 3.58mhz crystal ensures accurate and repeatable performance. with supply requirem ents between 2.7v and 5.5v and a low current consumption, the cmx683 can be easily integrated into a wide range of telecom equipments. the cmx683 has a similar pinout to all commonly used call progress detectors and is available in dip, tssop or soic pack ages.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 2 d/683/1 contents section page 1. brief description ................................ ................................ .................. 1 2. block diagram ................................ ................................ ..................... 3 3. signal list ................................ ................................ ............................ 4 4. external components ................................ ................................ .......... 5 5. general description ................................ ................................ ............. 6 5.1 overall function description ................................ ................. 6 5.2 glossary ................................ ................................ .................. 6 5.3 block diagram description ................................ ..................... 7 5.4 decode output truth table ................................ .................... 7 6. application notes ................................ ................................ ................ 8 7. performance specification ................................ ................................ .. 9 7.1 electrical performance ................................ ............................ 9 7.2 packaging ................................ ................................ .............. 12 note: this product is in development: changes and additions will be made to this specification. items marked tbd or left blank will be included in later issues. information in this data sheet should not be relied upon for final product design.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 3 d/683/1 2. block diagr am figure 1 block diagram
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 4 d/683/1 3. signal list soic package tssop package dip package d4 e4 p1 signal type description pin no. pin no. pin no. name 1 1 nc reserved for future use. do not make any connection to this pin. 2 2 1 xtal i/p the input to the on - chip oscillator, to be used in conjunction with the xtaln output. an external crystal only is required. all other components are on - chip. if the on - chip oscillator is not used, this pin should be connected to v ss . 3 3 clock in i/p the external clock input. connect the config pin to v dd to enable this input. 4 4 2 xtaln o/p the inverted output of the on - chip oscillator. leave unconnected if no t used. 5 5 3 enable i/p a logic 1 applied to this input enables all detector outputs. a logic 0 will force all detector outputs to a logic 0. 6 6 voice slow o/p when a non call progress signal is detected this output goes to a logic 1. (see table 1) . 7 7 4 cp detect o/p when a call progress signal is detected this output goes to a logic 1. (see table 1). 8 8 nc reserved for future use. do not make any connection to this pin. 9 9 nc reserved for future use. do not make any connection to th is pin. 10 10 5 sigin i/p signal input (which should be ac coupled as the dc bias on this pin is set internally). 11 11 nc reserved for future use. do not make any connection to this pin. 12 12 6 v ss power the negative supply rail (ground). 13 13 7 voice fast o/p when a non call progress signal is detected this output goes to a logic 1. (see table 1). 14 14 vref o/p internally generated reference voltage held at ?v dd and available to power external circuits. 15 15 8 v dd power the positive suppl y rail. this pin should be decoupled to v ss by a capacitor. 16 16 config i/p oscillator configuration. leave unconnected when using an external crystal. this pin has an internal pulldown to the v ss pin. notes: i/p = input o/p = output nc = no connection
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 5 d/683/1 4. external components typical values: c1 0.1f 20% c2 0.1f 20% x1 3.579545mhz (refer to section 1.7.1) note: c1 is not required if the input is referenced to vref. figure 2 recommended external components to achieve good noise performance, v dd decoupling and protection of the receive path from extraneous in - band signals are very important. it is recommended that the printed circuit board is laid out with a ground plane in the cmx683 area to provide a low impedance connection between the v ss pin and the v dd decoupling capacitor.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 6 d/683/1 5. general description 5.1 overall function description the cmx683 call progress tone detector uses different tone detection methods from those commonly found with other products. many traditional devices from other suppliers use a bandpass filter followed by an energy detector. the filter is usua lly designed to pass input signals with a frequency between about 300 and 700 hz, 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 t one, including signals due to speech, music, dtmf and noise. false outputs are a common feature with these products. to avoid background noise causing a stuck ?detect? output, the sensitivity of such devices is often poor. the cmx683, by contrast, uses a stochastic signal processing technique based on analysis in both the frequency and time domains, with signal amplitude forming part of the decision process. this analysis includes checks on whether the signal has a profile which matches international s tandards for call progress tones, or whether the profile is more likely to match that of dtmf, speech, music, noise or no signal. the frequency response of the cmx683 is confined to the call progress band, plus a small extension above and below this band. this ensures that the cmx683 will not respond to fax, modem or other out - of - band signals. the following glossary and the decode truth table in section 5.4 provide a simple explanation of the decoding functions and features offered by the cmx683. 5.2 g lossary call progress tones: the single and dual frequency tones in the range 350 to 620 hz which are specified widely for call progress signalling. call progress band: the nominal range 315 to 650 hz within which th e cmx683 will detect call progress tones. the detection algorithm requires that these tones have the characteristics typical of call progress tones. no signal: the absence of an input signal (below the detection threshold) or a signal below 190hz or a signal between 900hz and 10khz. non call progress ("voice") signal: a signal falling within the nominal range of 190 to 895 hz, but not within the call progress band or a signal falling within the nominal range of 190 to 895 hz, but not me eting the call progress detection requirements for that part of the signal which falls within the call progress band. subject to the duration and other characteristics of such signals, the cmx683 will usually interpret these as a non call progres s signal (ie "voice" activity). note that signals above 10khz should not exceed - 38db (relative to 775mvrms), to avoid aliasing. nominal: subject to dynamic tolerances within the signal analysis process. absolute values are not material or adverse to performance.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 7 d/683/1 5.3 block diagram description amplifier the input signal is amplified by a self - biased inverting amplifier. the dc bias of this input is internally set at ?v dd. signal analyser the f requency 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 must lie between 315 and 650 hz, and the signal to noise ratio must be 16db or greate r. the signal must have a minimum rms amplitude of about - 60db (relative to 775mvrms) and the signal must be consistent over a period of about 80ms. these decode criteria are continuously monitored and the assessment is updated every 6ms. to be classifi ed as a non call progress ("voice") signal the input signal frequencies must lie between 190 and 895 hz and the frequencies must not match the predefined profiles for dtmf or call progress signals. the signal must have a minimum rms amplitude of about - 6 0db (relative to 775mvrms) and the signal must show activity over a period of about 145ms (fast response) or 500ms (slow response). control and output logic this block categorises the nature of the signal into call progress and non call progress output states. a non call progress output is further checked for activity over a longer detection period, resulting in a voice fast output responding to speech/music in around 145ms and a voice slow output (with a more consistent detection) responding in around 500ms. if the voice fast output is at logic 1 for more than 51% of the previous 728ms then the voice slow output will change to a logic 1. if the voice fast output is at logic 1 for less than 10% of the previous 728ms then the voice slow output will chan ge to a logic 0. the decode output truth table on the following page gives further details. also refer to the timing diagram in figure 4. level detector the level detector operates by measuring the level of the amplified input signal and comparing it with a preset threshold, which has a nominal value of - 42db (relative to 775mvrms). the level detector output goes to the control and output logic block, where the call progress signal and voice detector outputs are gated with the level detector output. the cp detect, voice fast and voice slow outputs are valid only if the input signal level is above this preset threshold. xtal oscillator if the on - chip xtal oscillator is to be used, an external 3.58mhz crystal (x1) only is required and the config pin should be left unconnected. if an external clock source is to be used, the clock should be connected to the clock in input pin and the xtal pin should be connected to v ss . the xtaln pin should be left unconnected and the config pin must be connected to v dd . note that this external clock option is not available with the p1 package. 5.4 decode output truth table in the following truth table it should be noted that it is possible to get both cp detect an d voice fast or voice slow outputs simultaneously at logic 1. if the activity is initially consistent with and meets the call progress signal profile, the cp detect output will go to logic 1. if the activity subsequently meets the non call progress signa l profile, the voice fast output (and, eventually, the voice slow output) will go to a logic 1 without changing the cp detect output. the host c must then use cadence information to decide what signal is present. note that cp detect responds to the who le range of call progress tones from 315 to 650 hz.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 8 d/683/1 conditions cp detect "voice" fast/slow no signal 0 0 call progress signal: will detect 350+440, 400+450, 440+480, 400, 425, 440, 450, 480+620, 600 and 620hz tones 1 0 dtmf signal 0 0 non call progre ss signal (eg voice) 0 1 fax/modem or other out - of - band signals 0 0 table 1 decode output truth table 6. application notes on power - up, it will take no more than 15ms to initialise the internal state. this delay should be accounted for before the cp detect, voice slow and voice fast outputs are valid. figure 3 a typical telephone line circuit application r1 470k w r4 470k w c2 0.1f r2 470k w r5 100k w c3 0.01f 250v r3 470k w r6 100k w c4 0.01f 250v c5 0.1f note: 1. resistors 1%, capacitors 20%, unless otherwise stated. 2. a low offset opamp is needed. the decoupling capacitor c1 is not required if the quiescent dc level at the opamp output is the same as vref.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 9 d/683/1 7. performance specificatio n 7.1 electrical performance 7.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. units supply (v dd - v ss ) - 0.3 7.0 v voltage on any pin to v ss - 0.3 v dd + 0.3 v current into or out of v dd and v ss pins - 30 +30 ma current into or out of any other pin - 20 +20 ma p1 package min. max. units total allowable power dissipation at tamb = 25 c 800 mw ... derating 13.0 mw/c storage temperature - 55 +125 c operating temperature - 40 +85 c e4 package min. max. units total allowable power dissipation at tamb = 25c 300 mw ... derating 5.0 mw/c storage temperature - 55 +125 c operating temperature - 40 +85 c d4 package min. max. units total allowable power dissipation at tamb = 25c 800 mw ... derating 13.0 mw/c storage temperature - 55 +125 c operating temperature - 40 +85 c operating li mits correct operation of the device outside these limits is not implied. notes min. max. units supply (v dd - v ss ) 2.7 5.5 v xtal frequency 3.57 3.59 mhz
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 10 d/683/1 7.1.3 operating characteristics details in this section represent design target values a nd are not currently guaranteed. xtal frequency = 3.579545mhz, s/n = 16db, noise bandwidth = 5khz, v dd = 3.0v to 5.0v, tamb = - 40c to +85c. 0db = 775mvrms. notes min. typ. max. units dc parameters i dd (enable = 0) (v dd = 5.0v) 1 ? 250 ? a i dd (enable = 1) (v dd = 5.0v) 1 ? 1.0 1.5 ma i dd (enable = 1) (v dd = 3.0v) 1 ? 0.6 1.0 ma v ref output 8 45% 50% 55% v dd a c parameters sigin pin input impedance 2 ? 0.1 ? m w minimum input signal le vel ? - 38.0 ? db input signal dynamic range 40.0 ? ? db signal to noise ratio 16.0 ? ? clock input ?high? pulse width 3 100 ? ? ns ?low? pulse width 3 100 ? ? ns gain (i/p = 1mvrms at 100hz) 20.0 ? ? db leve l detector must detect signal level 4 - 38.0 ? ? db must not detect signal level 4 ? ? - 50.0 db call progress band 7 must detect range 315 ? 650 hz must not detect range 750 ? 250 hz logic interface input logic 1 l evel 5 80% ? ? v dd input logic 0 level 5 ? ? 20% v dd input leakage current (vin = 0 to v dd ) 5 - 5.0 ? +5.0 a input capacitance 5 ? 7.5 ? pf output logic 1 level (l oh = 120a) 6 90% ? ? v dd output logic 0 level (l ol = 360a) 6 ? ? 10% v dd notes: 1. not including any current drawn from the cmx683 pins by external circuitry. 2. small signal impedance over the frequency range 100hz to 2000hz and at v dd = 5.0v. 3. timing for an external input to the clock in pin. 4. input sign al level at v dd = 5.0v, scale signal for different v dd . 5. enable and config pins. 6. cp detect, voice fast and voice slow pins. 7. nominal values which are subject to dynamic tolerances within the signal analysis process, as a result of using stochas tic signal processing techniques. 8. load impedance on this output must exceed 330k w .
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 11 d/683/1 electrical performance (continued) figure 4 c parallel interface timings for the following conditions unless otherwise specified: xtal f requency = 3.579545mhz, v dd = 3.0v to 5.0v, tamb = - 40c to +85c, s/n = 20db. notes min. typ. max. units signal timings (ref. figure 4) t l burst length ignored 40.0 ms t l burst length detected 80.0 ms t gi call progress tone gap le ngth ignored 9 20.0 ms t gd call progress tone gap length detected 9 40.0 ms t rp call progress tone response time 10 80.0 ms t drp call progress tone de - response time 10 80.0 ms notes: 9. only applies to bursts of the same frequency. 10. measured with 350 + 440 hz tone pair.
call progress and "voice" detector cmx683 ? 2002 cml microsystems plc 12 d/683/1 7.2 packaging figure 5 soic mechanical outline: order as part no. cmx683d4 figure 6 tssop mechanical outline: order as part no. cmx683e4
call progress and "voice" detector cmx683 handling precautions: this product includes input protection, however, precautions should be taken to prev ent 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. www.cmlmi cro.com oval park - langford - maldon - essex - cm9 6wg - england. tel: +44 (0)1621 875500 fax: +44 (0)1621 875600 sales: sales@cmlmicro.com technical support: techsupport@cmlmicro.com 4800 bethania station road - winston - salem - n c 27105 - usa. tel: +1 336 744 5050, 800 638 5577 fax: +1 336 744 5054 sales: us.sales@cmlmicro.com technical support: us.techsupport@cmlmicro.com no 2 kallang pudding road - 09 to 05/06 mactech industrial building - singapore 349307. tel: +65 745 0426 fax: +65 7452917 sales: sg.sales@cmlmicro.com technical support: sg.techsupport@cmlmicro.com figure 7 dip mechanical outline: order as part no. cmx683p1

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