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data bulletin MX602 ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. calling line identifier / callin g line identifier on call waitin g preliminary information features applications 'zero-power' ring or line polarity reversal detector v23/bell202 fsk demodulator with data retiming facility dual-tone alert detector m c interrupt / wake-up output to minimize system operating power low power operation 0.5ma/1.0ma at 3.3v/5.5v dd 1 m a max. 'zero-power' current caller id caller id on call waiting (telephones and adjunct boxes) xtal xtal - + bandpass filter fsk demod level detector tone alert detector data retiming mode control logic rxd rxclk in- in+ ampout power supply circuits xtal osc and clock dividers det rd rt v dd v bias v ss zp mode input signal amplifier irq the MX602 is a low power cmos device used for the reception of physical layer signals in bellcore's calling identity delivery (cid) and calling identity on call waiting (cidcw) systems, british telecom calling line identification service (clip), the cable communications association's caller display services (cds), and similar evolving services. the device includes a 'zero-power' ring or line polarity reversal detector, a dual-tone (2130hz plus 2750hz) tone alert signal detector and a 1200-baud fsk v23/bell202 compatible asynchronous data demodulator with a data retiming circuit which removes the need for a uart in the associated c. it is suitable for 'on-hook' use in systems using bellcore specifications tr-nwt-000030 and sr-tsv-002476, british telecom specifications sin227 and sin242, cca tw/p&e/312, etsi ets 300 659-1 and ets 300 659-2 and mercury communications mnr 19. it is also suitable for off-hook use in some of those systems. the MX602 may be used with a 3.0v to 5.0v supply and is available in the following packages: 16-pin soic (MX602dw) and a 16-pin pdip (MX602p).
calling line identifier 2 MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. contents section page 1. block diagram ............................................................................................................... .................. 3 2. signal list ................................................................................................................. ....................... 4 3. external components ......................................................................................................... ............ 5 4. general description ......................................................................................................... ............... 6 4.1 mode control logic ......................................................................................................... ......................... 6 4.2 input signal amplifier ..................................................................................................... .......................... 6 4.3 bandpass filter ............................................................................................................ ............................ 7 4.4 level detector ............................................................................................................. ............................. 7 4.5 fsk demodulator............................................................................................................ ......................... 8 4.6 fsk data retiming .......................................................................................................... ........................ 8 4.7 tone alert detector ........................................................................................................ .......................... 9 4.8 ring or line polarity reversal detector .................................................................................... ............. 10 4.9 xtal osc and clock dividers................................................................................................ ................... 11 5. application notes........................................................................................................... ............... 12 5.1 typical caller identity delivery (caller id) system signals................................................................ .... 12 5.2 MX602 cidcw (calling line identity on call waiting) operation .......................................................... 13 5.2.1 introduction ............................................................................................................. ........................................13 5.2.2 overview ................................................................................................................. ........................................14 5.2.3 detailed procedure for cidcw transaction initiation detection ............................................................ ........16 5.2.4 block diagrams of adjunct box and telephone set interface ................................................................ ........17 5.2.5 timing diagrams.......................................................................................................... ...................................18 6. performance specification................................................................................................... ........ 22 6.1 electrical performance ..................................................................................................... ...................... 22 6.2 packaging .................................................................................................................. ............................ 26 mx com, inc. reserves the right to change specifications at any time and without notice.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 3 1. block diagram xtal xtal - + bandpass filter fsk demod level detector tone alert detector data retiming mode control logic rxd to / from c rxclk in- in+ ampout r8 r6 c6 c8 c9 r5 c5 c2 c1 x1 power supply circuits xtal osc and clock dividers det rd rt v dd v bias v ss ring or line polarity reversal detector input audio band input (components shown for unbalanced input) v dd 3.579545mhz zp mode input signal amplifier irq figure 1: block diagram
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 4 2. signal list pin no. signal type description 1 xtal output output of the on-chip xtal oscillator inverter 2 xtal input input to the on-chip xtal oscillator inverter 3 rd input (s) input to the ring or line polarity reversal detector 4 rt input / output open-drain output and schmitt trigger input forming part of the ring or line polarity reversal detector. an external resistor to v dd and a capacitor to v ss should be connected to rt to filter and extend the rd input signal 5 ampout output output of the on-chip input signal amplifier 6 in - input inverting input to the on-chip input signal amplifier 7 in + input non-inverting input to the on-chip input signal amplifier 8v ss power negative supply 9v bias output internally generated bias voltage, held at v dd /2 when the device is not in 'zero-power' mode. should be bypassed to v ss by a capacitor mounted close to the device pins. 10 mode input (s) input used to select the operating mode. 11 zp input (s) high level on this input selects 'zero-power' mode. 12 irq output open-drain output (active low) that may be used as an interrupt request / wake-up input to the associated c. an external pull-up resistor should be connected between this output and v dd . 13 det output logic level output driven by the ring or line polarity reversal detector, the tone alert detector or the fsk level detect circuits, depending on the operating mode. 14 rxclk input logic level input which may be used to clock received data bits out of the fsk data retiming block 15 rxd output logic level output carrying either the raw output of the fsk demodulator or re-timed 8-bit characters depending on the state of the rxclk input 16 v dd power positive supply. levels and thresholds within the device are proportional to this voltage. should be bypassed to v ss by a capacitor mounted close to the device pins. notes: input (s) = schmitt trigger input
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 5 3. external components line 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 xtal v dd v ss v bias ampout in+ in- rd rt rxd rxclk det irq zp mode x1 r1 r2 r3 r4 r5 r8 r6 r7 r9 r10 r11 d1-d4 c3 c2 c1 c4 c5 c6 c7 c8 c9 v dd v dd to / fr o m c line protection network a b MX602 xtal r1 470k w 1% r11 100k w 20% r2 note 1 1% c1, c2 18pf 20% r3, r4 c3, c4 0.1 m f 20% r5, r6 470k w 1% c5 0.33 m f 20% r7 c6, c7 680pf 20% r8 note 2, 3 470k w @ 3.3v 680k w @ 5.0v 1% c8,c9 0.1 m f 20% r9 note 2 240k w @ 3.3v 200k w @ 5.0v 1% x1 note 4 3.579545mhz 0.1% r10 160k w 1% d1 - d4 1n4004 figure 2 : recommended external components for dual bellcore and british telecom application recommended external component notes: 1. see section 4.8 2. see section 4.2 3. the recommended values of r8 were selected for applications in both bellcore and british telecom systems. optimum bellcore-only operation may be achieved by reducing the value of r8 e.g. to 656k w @ 5.0v. 4. for best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of v dd , peak to peak. tuning fork crystals generally cannot meet this requirement. to obtain crystal oscillator design assistance, consult your crystal manufacturer.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 6 4. general description 4.1 mode control logic the MX602's operating mode and the source of the det and irq outputs are determined by the logic levels applied to the mode and zp input pins; zp mode mode det output from irq output from 0 0 tone alert detect tone alert signal detection end of tone alert signal ring or line polarity reversal detector 0 1 fsk receive fsk level detector fsk data retiming (if enabled) and ring or line polarity reversal detector 1 0 zero-power ring or line polarity reversal detector ring or line polarity reversal detector 1 1 zero-power ring or line polarity reversal detector none in the 'zero-power' modes, power is removed from all of the internal circuitry except for the ring or line polarity reversal detector and the det and irq outputs. 4.2 input signal amplifier this amplifier is used to convert the balanced fsk and tone alert signals received over the telephone line to an unbalanced signal of the correct amplitude for the fsk receiver and tone alert detector circuits. - + v ss v bias ampout in+ in- r8 r6 r7 r9 r10 c6 c7 c9 a b input signal amplifier figure 3: input signal amplifier, balanced input configuration the design equations for this circuit are: differential volta g e gain v v = r9 = r8 r10 (r8 - r10) r6 = r7 = 470k r10 = 160k ampout (b-a) r r 8 6 ww the target differential voltage gain depends on the expected signal levels between the a and b wires and the MX602's internal overload and threshold levels, which are proportional to the supply voltage. the MX602 has been designed to meet the related specifications when r8 = 470k w at v dd = 3.3v nominal, rising to 680k w at v dd = 5.0v (see note) and r9 = 240k w at v dd = 3.3v dropping to 200k w at v dd = 5.0v as shown in section 4.2 figure 5 notes: 1. the recommended values of r8 were selected for applications in both bellcore and british telecom systems. optimum bellcore-only operation may be achieved by reducing the value of r8 e.g. to 656k w @ 5.0v.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 7 the input signal amplifier may also be used, with different external components, to allow the MX602 to operate from an unbalanced signal source as shown in figure 4. in this unbalanced signal configuration, the values of r6 and r8 are the same as used for the balanced input configuration @ 3.3v nominal. - + v ss v bias ampout in+ in- r8 r6 c6 c9 a input signal amplifier figure 4: input signal amplifier, unbalanced input configuration 0 100 200 300 400 500 600 700 800 900 1000 3 3.5 4 4.5 5 5.5 v dd r8 and r9 : k w r9 r8 figure 5: input signal amplifier, optimum values of r8 and r9 vs. v dd 4.3 bandpass filter is used to attenuate out of band noise and interfering signals from reaching the fsk demodulator, tone alert detector and level detector circuits. the characteristics of this filter, differs between fsk and tone alert modes. switched capacitor filter stages clocked at 57.7khz provide primary filtering. if the input signal is band limited to 28.85khz then no anti-aliasing filtering is required. 4.4 level detector this block operates by measuring the level of the signal at the output of the bandpass filter. it then compares it against a threshold which depends on whether fsk receive or tone alert detect mode has been selected. in tone alert detect mode the output of the level detector block provides an input to the tone alert signal detector. in fsk receive mode the MX602 det output will be set high when the level has exceeded the threshold for a sufficient duration. amplitude and time hysteresis are used to reduce chattering of the det output in marginal conditions. note: in fsk receive mode, this circuit may also respond to non-fsk signals such as speech.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 8 det line signal mode, zp fsk receiver mode fsk signal t dfon t dfoff see section 6.1 for definitions of t dfon and t dfoff figure 6: fsk level detector operation 4.5 fsk demodulator this block converts the 1200 baud fsk input signal to a digital data stream which is output via the rxd pin as long as the data retiming function is not enabled (see section 4.6). this output does not depend on the state of the fsk level detector output. note: in the absence of a valid fsk signal, the demodulator may falsely interpret speech or other extraneous signals as data. 4.6 fsk data retiming the data retiming block extracts the 8 data bits of each character from the received asynchronous data stream, and presents them to the m c under the control of strobe pulses applied to the rxclk input. the timing of these pulses is not critical and they may easily be generated by a simple software loop. this facility removes the need for a uart in the m c without incurring an excessive software overhead. the block operates on a character by character basis by first looking for the mark to space transition which signals the beginning of the start bit. using this transition as a timing reference, the block samples the output of the fsk demodulator in the middle of each of the following 8 received data bits, and stores the results in an internal 8-bit shift register. when the eighth data bit has been clocked into the internal shift register, the MX602 examines the rxclk input. if this is low then the irq output will be pulled low and the first of the stored data bits put onto the rxd output pin. on detecting that the irq output has gone low, the m c should pulse the rxclk pin high 8 times. the high to low transition at the end of the first 7 of these pulses will be used by the MX602 to shift the next data bit from the shift register onto the rxd output. at the end of the eighth pulse the fsk demodulator output will be reconnected to the rxd output pin. the irq output will be cleared the first time the rxclk input goes high. thus to use the data retiming function, the rxclk input should be kept low until the irq output goes low; if the data retiming function is not required the rxclk input should be kept high. the only restrictions on the timing of the rxclk waveform are those shown in figure 7 and the need to complete the transfer of all eight bits into the m c within 8.3msec (the time of a complete character at 1200 baud).
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 9 start stop 1 1 2 345678 8 output of fsk demod: rxclk input: rxd output: received character 'n' retimed data bits from received character 'n' data bit 1 data bit 2 t d rxclk rxd irq output: irq t d t clo t chi t d t d = internal MX602 delay (max 1 m s); t clo = rxclk low time (min 1 m s); t chi = rxclk high time (min 1 m s) figure 7: fsk operation with data retiming note: if enabled, the data retiming block will interpret the fsk channel seizure signal (a sequence of alternating mark and space bits) as valid received characters, with values of 55 (hex). similarly it may interpret speech or other signals as random characters. if the data retiming facility is not required, the rxclk input to the MX602 should be kept high. the asynchronous data from the fsk demodulator will then be connected directly to the rxd output pin, and the irq output will not be activated by the fsk signal. this case is illustrated in figure 8. start start stop stop 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 fsk demod output: rxd output: received character 'n' figure 8: fsk operation without data retiming (rxclk always high) 4.7 tone alert detector this block is enabled when the MX602 is set to tone alert detector operating mode. it then monitors the received signal for the presence of simultaneous 2130hz and 2750hz tones of sufficient level and duration. the MX602 det output will be set high while a valid tone alert signal is detected. at the end of the tone alert signal the det output will go low and the irq output will be pulled low until the MX602 is switched out of tone alert detector mode. det line signal mode, zp tone alert detect mode tone alert signal other mode t dton t dtoff irq see section 6.1 for definitions of t dton and t dtoff figure 9: tone alert detector operation
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 10 4.8 ring or line polarity reversal detector these circuits are used to detect the line polarity reversal and ringing signals associated with the calling line identification protocol. figure 10 illustrates their use in a typical application. line irq det rd rt zp mode from tone alert, energy detector and data retiming blocks c5 r1 r2 r5 v dd r3 r4 c3 c4 line protection network a b a b vt hi v ss vt hi v ss ring signal rd rt irq (zp and/or mode ) lo lo det (zp ) hi d1-d4 figure 10: ring or line polarity reversal operation when no signal is present on the telephone line, rd will be at v ss and rt pulled to v dd by r5 so the output of the schmitt trigger 'b' will be low. the ring signal is usually applied at the subscriber's exchange as an ac voltage inserted in series with one of the telephone wires and will pass through either c3 and r3 or c4 and r4 to appear at the top end of r1 (point x in figure 10) in a rectified and attenuated form. when the amplitude of the signal appearing at rd is greater than the input threshold (vt hi ) of schmitt trigger 'a' then the n transistor connected to rt will be turned on, pulling the voltage at rt to v ss by discharging the external capacitor c5. the output of the schmitt trigger 'b' will then go high, activating the det and/or irq outputs depending on the states of the mode and zp inputs. the minimum amplitude ringing signal that is certain to be detected is : () () 0.7 vt r1 r2 r3 r2 0.707v hi rms + ++ ? ? ? ? where vt hi is the high-going threshold voltage of the schmitt trigger a (see section 6.1). with r1, r3 and r4 all 470k w as indicated in figure 2, then setting r2 to 68k w will guarantee detection of ringing signals of 40v rms and above, for v dd , over the range 3.0 to 5.5v.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 11 a line polarity reversal may be detected using the same circuit but there will be only one pulse at rd. the british telecom specification sin242 says that the circuit must detect a +15v to -15v reversal between the two lines slewing in 30msec. for a linearly changing voltage at the input to c3 (or c4), then the voltage appearing at the rd pin will be dv dt c3 1 e r2 t t - ? ? ? ? ? - where () tc3r1r2r3 =++ and dv dt is the input slew rate. for dv/dt = 500v/sec (15v in 30msec), r1, r3 and r4 all 470k w and c3, c4 both 0.1 m f as indicated in figure 2, then setting r2 to 390k w will guarantee detection at v dd = 5.5v. if the time constant of r5 and c5 is large enough then the voltage on rt will remain below the threshold of the 'b' schmitt trigger keeping the det and/or irq outputs active for the duration of a ring cycle the time for the voltage on rt to charge from v ss towards v dd can be derived from the formula vv1e rt dd t r5c5 =- ? ? ? ? ? - as the schmitt trigger high-going input threshold voltage (vt hi ) has a minimum value of 0.56 x v dd , then the schmitt trigger b output will remain high for a time of at least 0.821 x r5 x c5 following a pulse at rd. using the values given in figure 2(470k w and 0.33 m f) gives a minimum time of 100 msec (independent of v dd ), which is adequate for ring frequencies of 10hz or above. if necessary, the c can distinguish between a ring and a reversal by timing the length of the irq or det output. 4.9 xtal osc and clock dividers frequency and timing accuracy of the MX602 is determined by a 3.579545mhz clock present at the xtal pin. this may be generated by the on-chip oscillator inverter using the external components c1, c2 and x1 of figure 2, or may be supplied from an external source to the xtal input, in which case c1, c2 and x1 should not be fitted. the oscillator is turned off in the 'zero-power' modes. if the clock is provided by an external source which is not always running, then the zp input must be set high when the clock is not available. failure to observe this rule may cause a significant rise in the supply current drawn by MX602 as well as generating undefined states of the rxd, det and irq outputs.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 12 5. application notes 5.1 typical caller identity delivery (caller id) system signals figure 11, figure 12, and figure 13 illustrate the line signaling and MX602 input and output signals for typical bellcore and british telecom system use. the data retiming function is not used in these examples (rxclk kept high). first ring chan seize mark message ringing 3 200ms 3400 to 4400 ms 250ms 150ms signaling rd rt mode zp det rxd irq 3 250ms figure 11: bellcore system signals chan seize mark message 250ms 150ms signaling rd rt fsk zp det rxd irq 0 1 0 1 1 0 figure 12: bellcore system signals (without ring)
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 13 the british telecom tone alert signal consists of simultaneous 2130hz and 2750hz tones. the 'chan seize' signal consists of a '1010..' fsk bit sequence in all cases. tone alert chan seize mark message ringing line reversal 88-110ms >200ms 80-262ms 45-75ms signaling rd rt irq mode zp det rxd note: idle 1 + idle 2 5 sec idle 2 ms < 4.8sec 3 100 2.5sec idle 2 45ms < 4.8sec 3 figure 13: british telecom system signals 5.2 MX602 cidcw (calling line identity on call waiting) operation 5.2.1 introduction cidcw is a telephone service which identifies a waiting caller without interrupting your current call. it eliminates the blin d spot in traditional call waiting by giving a telephone user the informed choice of whether or not to take the incoming call. to support cidcw, the circuits of caller id compatible telephone equipment and adjunct boxes must detect a subtle cpe alert signal (cas), a dual tone injected into phone conversations. the cas is transmitted by the central office to initiate a cidcw transaction consisting of an 80ms burst of simultaneous 2130hz and 2750hz tones. cas detection accuracy is very important because both missed and false signal detection is evident and annoying to telephone users. missed signal detection causes caller id information to be lost. false signal detection produces a disruptive tone which is heard by the far end caller. because the tone signals must be detected in the presence of conversations which both mask and masquerade as the tone signals, this function is very difficult to accurately achieve. this application note describes the use of the MX602 for cidcw cas detection. the MX602s 1a ring detect supply current, 3.3 to 5.5 volt supply range, and 16 pin package offer significant advantages in battery life and final product size.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 14 5.2.2 overview a successful cidcw transaction as described by bellcore sr-tsv-002476, consists of a sequence of actions between the cpe (customer premises equipment - e.g. a telephone) and the central office as indicated in figure 14. cas ack fsk data d ce b far voice near voice signals originating from far end cpe and central office signals originating at near end cpe far voice near voice a f a. normal conversation with both near and far voice present. b. central office mutes far end voice, emits cas and becomes silent c. cpe recognizes cidcw initiation and mutes near end voice and keypad d. cpe emits dtmf ack to central office to signal its readiness to receive caller id data stream e. central office recognizes ack and emits fsk data stream of caller id data which is received and decoded by cpe f. cidcw transaction is complete. cpe unmutes near end voice and central office unmutes far end voice returning to normal conversation with both near and far voice present. figure 14, cidcw transaction from near end cpe perspective from the near end cpes perspective, the initiation of a cidcw transaction is characterized by two events occurring in sequence: (1) a cas dual tone is received, and (2) a subsequent quiet period passes as far end speech continues to be muted. these two events can be detected by the MX602s dual tone alert detector and fsk level detector, respectively. caller id and cidcw end products typically use a microcontroller to manage the transfer and display of caller id data. the same microcontroller is easily used to observe and control the MX602 cidcw transaction initiation detection process. it measures an MX602 det output pulse duration, mutes near end voice, subsequently watches for det output activity, and controls whether the MX602 is in dual tone alert or fsk receive modes as shown in figure 15. see text for details of times t1, t2 & t3 fsk receive initiate mute of near end voice when det output has been high for time t1 MX602 mode detection algorithm state (see following text) MX602 det output the width of a valid det pulse is minimum t3 and maximum 65ms no det high activity during 50ms quiet period window confirms cidcw transaction initialization cas ack fsk data 4 time (t2) for mute to take effect 35 2 far voice near voice signals originating at far end cpe and central office signals originating at near end cpe far voice near voice 1 1 tone alert detect tone alert detect figure 15, cidcw transaction initiation with MX602 operation different strategies may be used for cidcw transaction initiation detection. the simplest strategy detects only the cas dual tone. more complex strategies may detect both the cas dual tone as well as the following far end voice quiet period
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 15 if near end voice is muted. the choice of a specific strategy involves several tradeoffs which must be considered by the end product designer. as previously described, the MX602 dual tone detector and fsk energy level detector functions provide the tools to implement a range of strategies. it is important to note that cidcw transaction detection performance is influenced by factors which are external to the MX602 and under the control of its surrounding circuit. such factors may include: (1) input signal levels provided to the MX602, (2) the functional cost associated with missed and false cidcw transaction detections, (3) pulse width measurement accuracy, and (4) noise or other disturbances introduced by muting or other external circuits. the remainder of this section provides examples to assist end product designers develop their specific designs. cidcw transaction initiation detection algorithm the following state transition diagram figure 16 and following text provide a detailed description of the cidcw detection procedure as shown in figure 15. 1 initial 2 wait_t1 3 meas_det_high 6 wait_det_low 4 confirm_quiet 5 complete_cidcw det goes high start timer timer = t1 initiate local speech muting timer = 50ms note: see text for details of times t1 & t3 det goes low when t3 < timer < 65ms set MX602 to fsk receive mode. reset timer det goes high when timer is < 50ms set MX602 to tone alert detect mode. unmute local speech. reset timer cidcw transaction complete set MX602 to tone alert detect mode. unmute local speech. reset timer det goes low when timer is < t3 unmute local speech. reset timer timer = 65ms unmute local speech det goes low reset timer det goes low reset timer transition stimulus actions during transition state 0 state 1 legend example figure 16, cidcw state flow diagram
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 16 5.2.3 detailed procedure for cidcw transaction initiation detection 1. initial state the MX602 is in the tone alert detect mode. on the rising edge of the det line, start the timer, and transition to the wait_t1 state. 2. wait_t1 state during this state, the det output high time is measured so that pulses lasting less than t1 may be ignored. while timer < t1 if det goes low reset the timer. transition to the initial state. initiate local speech muting. transition to meas_det_high state. 3. meas_det_high state while timer < 65ms if det goes low if timer < t3 unmute local speech. reset the timer. transition to the initial state. else set MX602 to fsk receive mode. reset the timer. transition to the confirm_quiet state. unmute local speech. transition to the wait_det_low state. 4. confirm_quiet state while timer < 50ms if det goes high set MX602 to tone alert detect mode. unmute local speech. reset the timer. transition to the initial state. transition to the complete_cidcw state. 5. complete_cidcw state this state handles the remaining cidcw transaction functions e.g. determine that no near end extensions are off hook, emit a cpe ack to central office via a dtmf d tone signal, receive the fsk caller id data stream, etc. when cidcw transaction is complete set the MX602 to tone alert detect mode. unmute local speech. reset the timer. transition to the initial state. 6. wait_det_low state when det goes low reset the timer transition to the initial state. times t1, t2, & t3 the values given below have been selected to give an extremely low incidence of false cas detections while maintaining a high probability of decoding correct cidcw initiation signals by taking advantage of the specific profile of MX602's responses to typical speech and cas signals. two timing options are given, telephone set and adjunct box, the choice being determined principally by how easily local speech can be muted. the adjunct box option reduces the frequency of short speech mutes by a factor of about 5 at the expense of a small increase in the number of missed cas signals when compared to the telephone set option.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 17 adjunct box timing when the cidcw circuits are housed in an adjunct box so that muting is only possible by interrupting the 2-wire connection to the telephone set, then it is recommended that: t1 should be 15ms i.e. speech muting should only be initiated after the det output has been high for 15ms. t2 , the time for speech muting to take effect, should be as short as possible and in any case not more than 5ms. t3 , the minimum length of a valid det output high time, should be equal to t1 plus t2 plus 10ms, i.e. between 25 and 30ms. telephone set timing when the cidcw circuits are built into the telephone set so that locally generated speech can be muted quickly and without injecting noise then it is recommended that: t1 should be zero, i.e. muting should be initiated as soon as the MX602 det output goes high. t2 , the time for local speech muting to take effect, should be as short as possible and in any case not more than 5ms. t3 , the minimum length of a valid det output high time, should be 15ms. notes: 1. the t1, t2, and t3 time values are intended to provide guidance, however, different times may be required for optimal operation in specific end product designs. 2. for optimum performance, the system transition times from tone detect to muting and tone detect de-response to fsk mode should be minimized. tests have been performed with sub-millisecond response times but longer times may be used with some degradation in performance. 3. the 50ms monitoring period of the confirm_quiet state, when added to the 0.5 to 10ms de-response time of the MX602 in tone alert detect and a nominal 0 to 5ms delay in changing from tone mode to fsk mode, results in a valid cas detection occurring at between 50 and 65ms after the end of the cas. this leaves at least 35ms to mute the local handset fully, test for off-hook extensions, and initiate the dtmf ack tone within the time permitted by cidcw specifications. 4. during the confirm_quiet state, any high pulses on the det output will last for at least 8ms (or until the mode is changed). this makes it simple to monitor and detect any det high output pulses when in this state. 5. in adjunct box applications, it is important to avoid injecting noise to the MX602 input signal when performing near end voice muting because such noise could disrupt MX602 operation and reduce performance. alternate approaches can be used which would delay such voice muting until after the cas tone. one example would first qualify dual tone detector output pulses of 20ms to 65ms nominal duration as cas tone indications and follow such pulses with near end voice muting and silence confirmation to further enhance performance. 5.2.4 block diagrams of adjunct box and telephone set interfaces ring cpe (phone) central office hook switch tip nc mute control rt ampout MX602 input interface components (r, c, d) rd in- in+ c rxd rxclk det zp caller identity display, user interface, etc. line hold ckt. line protection network irq figure 17: adjunct box interface
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 18 tip ring central office nc mute control rt ampout MX602 input interface components (r, c, d) rd in- in+ c rxd rxclk det zp caller identity display line protection network irq audio circuits dtmf encoder hook switch keypad figure 18: telephone set interface 5.2.5 timing diagrams figure 19, figure 20, figure 21, figure 22, figure 23, figure 24, figure 25, and figure 26 are timing diagrams which illustrate the cidcw transaction initiation sequence for various cases. note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode near end voice far end voice < 5ms between the falling edge of the det and fsk mode selection. t , time for muting to take affect 2 det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 det monitored for 50ms after mode change 0.5ms to 10ms from end of cas to det falling edge t det 50ms cas 75ms t 85ms << cas mute decision point t 1 t , minimum valid det pulse width 3 start timer initiate cidcw transaction sequence at this point figure 19, valid cidcw transaction initiation adjunct box timing sequence
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 19 note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode t , time for muting to take affect 2 t det cas mute decision point t 1 <15ms, minimum valid t det start timer not a valid cidcw transaction sequence at this point near end voice far end voice t , minimum valid det pulse width 3 0 level no signal det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 figure 20, invalid cidcw transaction initiation adjunct box timing sequence (det pulse < 15ms) note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode t , time for muting to take affect 2 t det cas mute decision point t 1 65ms, maximum valid t det start timer not a valid cidcw transaction sequence at this point near end voice far end voice t , minimum valid det pulse width 3 0 level no signal det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 figure 21, invalid cidcw transaction initiation adjunct box timing sequence (det pulse > 65ms)
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 20 note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode near end voice far end voice < 5ms between the falling edge of the det and fsk mode selection. t , time for muting to take affect 2 det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 should a det pulse occur during the 50ms det monitoring, the pulse will last a minimum of 8ms t det 50ms cas mute decision point t 1 t , minimum valid det pulse width 3 start timer not a valid cidcw transaction sequence at this point det monitored for 50ms after mode change no signal figure 22, invalid cidcw transaction initiation adjunct box timing sequence (det output goes high during 50ms quiet period) note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode near end voice far end voice < 5ms between the falling edge of the det and fsk mode selection. t , time for muting to take affect 2 det monitored for 50ms after mode change 0.5ms to 10ms from end of cas to det falling edge t det 50ms cas 75ms t 85ms << cas mute decision point t = 0 (no hold-off) 1 t , minimum valid det pulse width 3 start timer initiate cidcw transaction sequence at this point det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 figure 23: valid cidcw transaction initiation telephone set timing sequence
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 21 note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode t , time for muting to take affect 2 det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 t det cas mute decision point t = 0 (no hold-off) 1 <15ms required for minimum valid t det start timer not a valid cidcw transaction sequence at this point near end voice far end voice t , minimum valid det pulse width 3 0 level no signal figure 24: invalid cidcw transaction initiation telephone set timing sequence (det pulse < 15ms) note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode t , time for muting to take affect 2 det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 t det cas mute decision point t = 0 ( no hold-off) 1 65ms, maximum valid t det start timer not a valid cidcw transaction sequence at this point near end voice far end voice t , minimum valid det pulse width 3 0 level no signal figure 25: invalid cidcw transaction initiation telephone set timing sequence (det pulse 3 65ms)
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 22 note: the actual signal received by the MX602 is the sum of the cas, near-end voice, and far-end voice signals. det mute tone / fsk mode near end voice far end voice < 5ms between the falling edge of the det and fsk mode selection. t , time for muting to take affect 2 t det 50ms cas mute decision point t = 0 (no hold-off) 1 t , minimum valid det pulse width 3 start timer not a valid cidcw transaction sequence at this point should a det pulse occur during the 50ms det monitoring, the pulse will last a minimum of 8ms det monitored for 50ms after mode change no signal det pulse width (t ) must be > t or < 65ms to be considered a valid det det 3 figure 26: invalid cidcw transaction initiation telephone set timing sequence (det output goes high during 50ms quiet period) 6. performance specification 6.1 electrical performance absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. units supply (v dd - vss) -0.3 7.0 v voltage on any pin to vss -0.3 v dd + 0.3 v current into or out of v dd and vss pins -30 30 ma current into or out of any other pin -20 20 ma dw /dip package total allowable power dissipation at t amb = 25c 800 mw derating above 25c 13 mw/c above 25c storage temperature -55 125 c operating temperature -40 85 c operating limits correct operation of the device outside these limits is not implied. notes min. max. units supply (v dd - vss) 3.0 5.5 v operating temperature -40 85 c xtal frequency 1 3.575965 3.583125 mhz operating limits notes: 1. a xtal frequency of 3.579545mhz 0.1% is required for correct tone alert and fsk detection.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 23 operating characteristics for the following conditions unless otherwise specified: v dd = 3.0v at t amb = 25c and v dd = 3.3v to 5.5v at t amb = - 40 to +85c, v ss = 0v xtal frequency = 3.579545mhz 0.1%, 0dbv corresponds to 1.0v rms notes min. typ. max. units dc parameters i dd (zp input high) at v dd = 5.0v 1,2 1.0 m a i dd (zp input low) at v dd = 3.0v 1 0.5 1.0 ma i dd (zp input low) at v dd = 5.0v 1 1.0 2.0 ma logic 1 input level (rxclk and xtal inputs) 70% v dd logic 0 input level (rxclk and xtal inputs) 30% v dd logic input leakage current (v in = 0 to v dd ), xtal input -1.0 1.0 m a output logic 1 level (l oh = 360a) v dd - 0.4 v output logic 0 level (l ol = 360a) 0.4 v irq output 'off' state current (v out = v dd ) 1.0 a schmitt trigger input thresholds (figure 27) high going (vt hi ) (0.56)(v dd ) (0.56)(v dd ) + 0.6 v low going (vt lo ) (0.44)(v dd ) - 0.6 (0.44)(v dd ) v tone alert detector 'low' tone nominal frequency 2130 hz 'high' tone nominal frequency 2750 hz start of tone alert signal to det high time (t dton figure 9) 40 msec end of tone alert signal to det and irq low time (t dtoff figure 9) 0.5 10.0 msec to ensure detection: 3 'low' tone frequency tolerance 20 hz 'high' tone frequency tolerance 30 hz tone level of each simultaneously applied tone 4 -40.0 -2.2 dbv 2750hz tone level with respect to 2130hz tone level -7.0 7.0 db signal to noise ratio 5 20.0 db dual tone burst duration 75 msec to ensure non-detection: 6 'low' tone frequency tolerance 75 hz 'high' tone frequency tolerance 95 hz level (total) 4 -46.0 dbv dual tone burst duration 25 msec fsk receiver transmission rate 1188 1200 1212 baud v23 mark (logic 1) frequency 1280 1300 1320 hz v23 space (logic 0) frequency 2068 2100 2132 hz bell202 mark (logic 1) frequency 1188 1200 1212 hz bell202 space (logic 0) frequency 2178 2200 2222 hz valid input level range 4 -40.0 -8.0 dbv
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 24 notes min. typ. max. units acceptable twist (mark level with respect to space level) v23s -7.0 7.0 db bell202 -10.0 10.0 db acceptable signal to noise ratio v23 5 20.0 db bell202 5 30.0 db level detector 'on' threshold level 4 -40.0 dbv level detector 'off' to 'on' time (t fdon figure 6) 25.0 msec level detector 'on' to 'off' time (t fdoff figure 6) 8.0 msec input signal amplifier input impedance 7 10.0 m w voltage gain 500 v/v xtal input 'high' pulse width 8 100 ns 'low' pulse width 8 100 ns operating characteristics notes: 1. at 25 c, not including any current drawn from the MX602 pins by external circuitry other than x1, c1 and c2. 2. rd, mode, rxclk inputs at v ss , zp input at v dd . see figure 28 3. all conditions must be met to ensure detection. 4. for v dd = 5.0v with equal level tones and with the input signal amplifier external components as section 3. the internal threshold levels are proportional to v dd . for other supply voltages or different signal level ranges the voltage gain of the input signal amplifier should be adjusted by selecting the appropriate external components as described in section 4.2 5. noise (either impulsive or random type that has a flat frequency spectrum at the frequency range of interest) in the 300hz-3400hz band for v23 and 200hz-3200hz for bell202. 6. meeting any of these conditions will ensure non-detection. 7. open loop, small signal, low frequency measurements. 8. timing for an external input to the clock/xtal pin.
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 25 0 0.5 1 1.5 2 2.5 3 3.5 4 33.5 44.5 55.5 v dd vt lo vt hi v in figure 27: schmitt trigger typical input voltage thresholds vs. v dd 0.0001 0.001 0.01 0.1 1 10 -40-30-20-10 0 1020304050607080 temperature a figure 28: typical 'zero-power' i dd vs. temperature (v dd = 5.0v)
calling line identifier MX602 - preliminary information ? 1998 mx com inc. www. mxcom.com tele: 800 638-5577 336 744-5050 fax: 336 744-5054 doc. # 20480136.004 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 26 6.2 packaging pin 1 a b alternative pin location marking x p j y c k h e l t w z note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e h typ. max. min. dim. j p x w t y k l 0.105 (2.67) 0.093 (2.36) 0.419 (10.64) 45 7 0 10 0.050 (1.27) 0.041 (1.04) 0.413 (10.49) 0.299 (7.59) 0.050 (1.27) 0.016 (0.41) 0.390 (9.90) 0.020 (0.51) 0.003 (0.08) 0.009 (0.23) 0.0125 (0.32) 0.013 (0.33) 0.020 (0.51) 0.395 (10.03) 0.286 (7.26) z 5 5 figure 29 : 16-pin soic mechanical outline: order as part no. MX602dw package tolerances note : all dimensions in inches (mm.) angles are in degrees typ. max. min. a b c e e1 h dim. j j1 p y t k l 0.200 (5.06) 0.262 (6.63) 0.390 (9.91). 7 0.150 (3.81) 0.810 (20.57) 0.135 (3.43) 0.100 (2.54) 0.121 (3.07) 0.300 (7.62) 0.290 (7.37) 0.325 (8.26) 0.015 (0.38) 0.070 (1.77) 0.008 (0.20) 0.015 (0.38) 0.014 (0.35) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.056 (1.42) 0.064 (1.63) 0.740 (18.80) 0.240 (6.10) b a pin 1 e y e1 t k h j1 j c p l figure 30 : 16-pin pdip mechanical outline: order as part no. MX602p
cml product data in the process of creating a more global image, the three standard product semiconductor companies of cml microsystems plc (consumer microcircuits limited (uk), mx-com, inc (usa) and cml microcircuits (singapore) pte ltd) have undergone name changes and, whilst maintaining their separate new names (cml microcircuits (uk) ltd, cml microcircuits (usa) inc and cml microcircuits (singapore) pte ltd ), now operate under the single title cml microcircuits . these companies are all 100% owned operating companies of the cml microsystems plc group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. cml microcircuits product prefix codes until the latter part of 1996, the differentiator between products manufactured and sold from mxcom, inc. and consumer microcircuits limited were denoted by the prefixes mx and fx respectively. these products use the same silicon etc. and today still carry the same prefixes. in the latter part of 1996, both companies adopted the common prefix: cmx. this notification is relevant product information to which it is attached. cml microcircuits (usa) [formerly mx-com, inc.] product textual marking on cml microcircuits (usa) products, the ?mx-com? textual logo is being replaced by a ?cml? textual logo. company contact information is as below: cml microcircuits (uk)ltd communication semiconductors cml microcircuits communication semiconductors cml microcircuits (singapore)pteltd communication semiconductors cml microcircuits (usa) inc. communication semiconductors oval park, langford, maldon, essex, cm9 6wg, england tel: +44 (0)1621 875500 fax: +44 (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com 4800 bethania station road, winston-salem, nc 27105, usa tel: +1 336 744 5050, 0800 638 5577 fax: +1 336 744 5054 us.sales@cmlmicro.com www.cmlmicro.com no 2 kallang pudding road, 09-05/ 06 mactech industrial building, singapore 349307 tel: +65 7450426 fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com d/cml (d)/2 may 2002

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