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L3037 subscriber line interface circuit monochip silicon slic suitable for public/private applications implements all key features of the borscht function soft battery reversal with pro- grammable transition time (3 to 100ms) metering pulse injection and filter- ing with minimal components count (no trimming required). protection resistor mismatch com- pensation on hook transmission loop start/ground start feature ind temp. range: -40 c to +85 c low power dissipation in all oper- ating modes integrated zero crossing relay driver integrated (noise-less) ring trip de- tection very low no. of std tolerance ex- ternal components select part for u.s. applications (63db typ. long. balance) surface mount package (plcc44 or pqfp44) integrated thermal protection pin to pin compatible with l3035/36 description the L3037 subscriber line interface circuit is a bi- polar device in 70v technology developed for cen- tral office / loop carrier and private applications. the L3037 is pin to pin and function compatible with l3035/36. one particular pin (reserved in l3035/36) is now used for reverse polarity transi- tion time programming. the line polarity transition is not affecting the ac signal transmission that can continue also during the line voltage transi- tion.L3037 is available in two different package options: plcc44 and pqfp44 (10 x 10mm). this is advanced information on a new product now in development or undergoing evaluation. details are subject to change without notice. december 1997 block diagram plcc44 pqfp44(10 x 10) ordering numbers: L3037fn L3037qn 1/22
line status ogk odet d0 d1 gst lim commands ilt icrt vref icrt 0 cross detect. crt rel grel rgin ilt ill (ia+ib)/200 (ia-ib)/200 1 ia -1 ib (ia+ib)/200 ac+dc ac supply regulator irev dc reference & bias switching 1 1 ttxin rx zac zb tx acfd rs cac rttx iref vcc vss agnd crev vb cf base rdc iltf vreg bgnd ring tip sring stip ac processor dc processor line interface supervision logic interface & decoder + - 2.32 1 bias d94tl136 L3037 functional diagram L3037 pin functionality (plcc44) no. name function 1 2 3 4 5 6 7 8 9 10 to14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 to 36 37 38 39 40 41 42 43 44 v cc i ltf rdc cf base bgnd vreg stip tip vb ring sring crt odet rgin ogk gst d1 d0 lim v ss rel crev grel cac rs zb vb tx rx z ac ttxin rttx acfd agnd i ref supply input (+5v) analog output (current source) analog input (current input) analog input (voltage input) analog output (voltage source) ground input (0v) supply input (vreg) analog input (voltage input) analog output (voltage output) supply input (-v bat ) analog output (voltage output) analog input (voltage input) analog input/output (voltage input / current output) digital output (voltage output with internal pull up) analog input (current input) digital output (voltage output with internal pull up) digital input (voltage input, internal pull down) digital input (voltage input) digital input (voltage input) digital input (voltage input 3 levels: 0, +5, open) supply input (-5v) digital output (voltage output open drain) analog input/output (voltage input/current output) ground input (0v) analog input (current input) analog input/output (current output/voltage input) analog input (voltage input) supply input (-v bat ) analog output (voltage output) analog input (voltage input) analog output (voltage output) analog input (voltage input) analog output (voltage output) analog input (voltage input) ground input (0v) analog input/output (voltage output/current input) L3037 2/22
pin connection (top view) absolute maximum ratings symbol parameter value unit v bat battery voltage -64 to v ss +0.5 v v cc positive supply voltage (0 to 1ms) (continuous) -0.4 to +7 -0.4 to +5.5 v v v ss negative supply voltage (0 to 1ms) (continuous) -7 to +0.4 -5.5 to +0.4 v v v ag nd - v bgnd agnd respect bgnd (continuous) -2 to +2 v v rel ring relay supply voltage 14 v v dig digital i/o d0, d1, gst, lim, odet, ogk -0.4 to +5.5 v i dig digital i/o d0, d1, gst, lim, odet, ogk -3 to +3 ma t j maximum junction temperature +150 c t stg storage temperature -55 to +150 c hu humidity 5 to 95 % note: in case of power on, power failure or hot insertion with v dd ,v ss present and v bat floating the absolute maximum ratings can be exceeded with vbat > v ss +0.5v. in this case the power consumption of the device increases and the logic output state including relay driver are not controlled. this effect can be prevented ensuring that vbat is always present before v dd and v ss or connecting one shottky diode (e.g. bat49x or equivalent) between vbat and v ss . one diode can be shared between all the slics of the same line card. operating range symbol parameter value unit t op operating temperature range -40 to +85 c v ag nd - v bgnd difference between agnd and bgnd -2 to +2 v v cc positive supply voltage +4.5 to +5.5 v v ss negative supply voltage -5.5 to -4.5 v v bat battery voltage -62 to -17 v v rel ring relay supply voltage 4 to 13 v thermal data symbol parameter plcc44 pqfp44 unit r th j-amb thermal resistance junction-ambient max. 45 75 c/w plcc44 1 2 3 5 6 4 7 8 9 10 17 11 18 19 20 21 22 44 43 42 41 39 40 38 37 36 35 34 28 27 26 24 23 25 33 32 31 29 30 n.c. n.c. tip vreg vb stip crt n.c. sring n.c. ring odet rgin ogk gst d0 d1 lim v ss rel crev grel bgnd base cf rdc v cc iltf iref agnd n.c. acfd rttx vb n.c. n.c. rs cac zb ttxin zac rx n.c. tx d94tl129 12 13 14 15 16 pqfp44 L3037 3/22
pin description unless otherwise specified all the diagrams in this datasheet refers to the plcc44 pin connection. pqfp44 no. plcc44 no. pin description 39 1 v cc positive power supply (+5v) 40 2 i ltf transversal line current image ((i a +i b ) / 200) 41 3 rdc dc feedback input (the rdc resistor is connected from this node to i ltf ) 42 4 cf battery voltage ripple rejection (c svr capacitor is connected from this node to bgnd). 43 5 base driver for external transistor base 44 6 bgnd battery ground 2 7 vreg regulated voltage. provides negative power supply for the power amplifier. (connected to emitter of the external transistor.) 3 8 stip input of a power amplifier (when no compensation of ext. ptc resistor mismatch is requested it must be shorted to the tip lead). 4 9 tip a line termination output (i a is the current sourced from this pin). 1, 28 10 to 14 32 to 36 vb battery supply plcc44 : all pins are internally connected together. pqfp44 : it is mandatory to short pin 1 and pin 28 as closed as possible to the device. 8 15 ring b line termination output (i b is the current sunk into this pin). 9 16 sring input of b power amplifier (when no compensation of ext. ptc resistor mismatch is requested it must be shorted to the ring lead). 11 17 crt ring trip and ground key capacitor 12 18 odet on/off hook and ring trip output (when disable is internally pulled up) 13 19 rgin ring input signal. (when open is internally pulled to gnd) 14 20 ogk ground key output (when disable is internally pulled up) 15 21 gst a open command (when open is internally pulled down) 16 22 d1 bit 1 17 23 d0 bit 0 18 24 lim current limitation program. (when open is internally forced to 44ma current limitation) 19 25 v ss negative power supply (-5v) 20 26 rel ring relay driver output 21 27 crev reverse polarity transition time control. one proper capacitor connected between this pin and agnd is setting the reverse polarity transition time. if reverse polarity feature is not used must be open or connected to agnd through a filter capacitor. 22 28 grel ground reference for ring relay driver 23 29 c ac ac feedback input (acdc split capacitor is connected from this node to iltf) 24 30 r s protection resistors image (the image resistor is connected from this node to acfd) 25 31 z b balance network for 2 to 4 wire conversion (the balance impedance z b is connecetd from this node to agnd. the z a impedance is connected from this node to z ac ) 30 37 tx 4 wire output port (tx output) 31 38 rx 4 wire receiving port. (rx input) 32 39 z ac rx buffer output (the ac impedance is connected from this node to acfd) 33 40 ttxin metering input port/v drop programming. if not used should be connected to agnd. 34 41 rttx metering cancellation network. if not used should be left open. 35 42 acfd ac impedance synthesis 37 43 agnd dc and ac signal ground 38 44 i ref voltage reference output 2,5 to 7, 10,26, 27, 29,36 n.c. not connected L3037 4/22
description (continued) one special selection with high longitudinal balan- ce performances allows to meet the united states bellcore requirements for central office/loop carrier and private applications. the slic integrates loop start, ground start, ground key on/off-hook, automatic ring-trip as well as zero crossing ring relay driver. two to four wire conversion is implemented by the slic for application with first generation combo. in case of application with second generation (pro- grammable) combo this function can be imple- mented outside saving external components. the L3037 offers programmable current limitation (3 ranges), on hook transmission and low power in all operating modes, power management is controlled by a simple external low cost transistor. metering pulses are injected on the line via a sum- ming node through ttxin pin. metering pulse filtering is performed by means of a simple rc network with standard tolerance compo- nents. in case ttx function is not used this pin must be connected to agnd. it is also possible to use this pin to modify the dc voltage drop between tip/ring terminals and battery voltage for appica- tions where it is important to optimize the battery voltage supply versus the signal swing. effect of protection resistors mismatch are com- pensated by a feedback loop on the final stage al- lowing good long balance performances also with large tolerance protection resistors (ex: ptc). this function allow the L3037 to be fully conform to bellcore power cross and surge test and meet also the longitudinal balance specification without using matched ptc resistors. an integrated thermal protection circuit forces the L3037 in power down (pd) mode when the junction temperature exceeds 150 c typ. the L3037 is specified over -40 c to +85 cam- bient temperature range. the L3037 package is a surface mount plcc44 or pqfp44. functional description L3037 is designed in 70v bipolar technology and performs the telephone line interface functions re- quired in both c.o. and pabx environments. the full range of signal transmission, battery feed, loop supervision are performed. signal transmission performance is compatible with european and north american standards and with ccitt recommendations. ringing, overvoltage and power cross protection are performed by means of external networks. the signal transmission function includes both 2 to 4 wire and 4 to 2 wire conversion. the 2w ter- mination impedance is set by means of an exter- nal impedance which may be complex. the 2 to 4 wire conversion is provided by means of an exter- nal network. such a network can be avoided in case of appli- cations with comboii, in this case the 2 to 4 wire conversion is implemented inside the comboii by means of the programmable hybal filter. an additional input allows a metering pulse signal to be added on the line. the dc feed resistance is programmable with one external resistor. three different values of current limitation (25, 44, 55ma)can be selected by software through the parallel digital interface. one external transistor reduces the power dissi- pation inside the L3037 in the presence of a short loop (limiting current region). an additional supervisory function sets the tip lead into high impedance state in order to allow application in ground start configurations. the different L3037 operating modes are control- led by a 4bit logic interface, two additional detec- tor outputs provide ground key detection and ei- ther hook state or ring trip detection. slic operating modes through the L3037 digital interface it is possible to select 5 different slic operating modes: 1) active mode (act) 2) standby mode (sby) 3) tip open mode (to) 4) power down mode (pd) 5) ringing mode (rng) in both act and sby modes it is possible to se- lect the reverse polarity (see control interface). transition from direct to reverse polarity is soft and the transition time is defined by the external capacitor crev. active mode (act) this operating mode is set by the card controller when the off-hook condition has been recognized. when this operating mode is selected the two out- put buffers (tip/ring) can sink or source up to 100ma each. in case of ground key or line termi- nals to gnd the output current is limited to 15ma for the tip wire and 30ma for the ring wire. as far as the dc characteristic is concerned three different feeding conditions are present: a) current limiting region: the dc impedance of the slic is very high ( 20kohm) and therefore the system works like a current source. using the L3037 digital interface it is possible to select the value of the limiting current: 25ma, 44ma, or 55ma. when the device is in limiting current region the negative supply for the output buffer is fixed by L3037 5/22
the ext. transistor to a proper value higher than the real negative battery in order to reduce the power dissipated by the L3037 itself. b) resistive feed region: the characteristic is equal to a battery voltage (vbat) in series with a resistor (typ 400ohm or 800ohm) whose value is set by one ext. resistor (see ext. components list). c) constant voltage region: the characteristic is equal to the battery voltage - 12v in series with the ext. protection resistors (typ 80ohm). this voltage drop between battery and line termi- nals for il=0 allows on-hook transmission. fig. 1 shows the dc characteristic in active mode. fig. 2 shows the line current versus loop resistance in active mode the ac impedance at the line ter- minals is sinthetized by the external components zac and rp according to the following formula: zs = zac/50 + 2*rp depending on the characteristic of the zac net- work zs can be either a pure resistance or a com- plex impedance. this allows L3037 to meet diffe- rent standard as far as return loss is concerned. the capacitor ccomp guarantees stability to the system. the two to four wire conversion is achieved by means of a circuit that can be represented as a wheastone bridge, the branches of which are: 1) the line impedance (zline) 2) the slic impedance at line terminals (zs) 3) the balancing network za+ra connected between pin zac and zb of L3037. 4) the network zb between pin zb and gnd that shall copy the line impedance. when L3037 is used with a second generation combo (eg ts5070fn) which is able to perform the two to four wire conversion, the two impedances za and zb can be removed and the zb pin con- nected to gnd. the -6db tx gain of the L3037 al- lows the echo signal to remain always within the comboii hybrid balance filter dynamic range. the injection of high frequency metering pulses is carried out through the slic. an unbalanced 12 or 16khz sinusoidal signal with shaping is, when ne- cessary, applied at the ttxin input of the slic. a fixed transfer gain is provided for the metering si- gnal. to avoid saturation in the 4-wire side a can- cellation is provided in the 4-wire transmission path. cancellation is obtained via an external rc net- work without the need for trimmed components. when the ttx function is not used ttxin input should be connected to gnd. since this pin is di- rectly connected to a summing node inside the slic any signal applied to the ttxin is transfer- red to the line with a fixed transfer gain. in special applications, this pin can be used to modify the voltage drop (constant voltage region of dc characteristic) simply by applying a proper dc level on the ttxin pin, allowing optimization of the battery voltage versus the maximum nee- ded ac signal swing. in active mode, with a -48v battery voltage, the L3037 dissipate 150mw for its own operation (in- cluding the power dissipation from +5/-5 supply), the dissipation related to the current supplied to the line should be added in order to get the total dissipation. stand-by mode (sby) in this mode the bias current of the L3037 is redu- ced and only some part of the circuit are completely active. the transversal current supplied to the line is limited at 14ma. common mode current rejection is performed and the total current capability of the output stages (tip and ring) is limited to 30ma. the open circuit voltage is |vbat|-7v. both off/hook and ground key detectors are acti- ve. signal transmission is not operating. in stand-by mode, with a -48v battery voltage, the L3037dissipates90mw typ. (including the power dis- sipationfrom a +5/-5v supply). stand-by mode is usually selected when the telepho- ne is in on-hook condition. it allows a proper off-hook detection, even in the presence of high common mode currents, or with telephone sets sinking a few milliamperes of line current in on- hook condition. figure 1: dc characteristic in active mode figure 2: current vs. loop resistance. rfeed = 2 x 200ohm, lim. currents: 25, 43, 55ma L3037 6/22
tip open mode (to) this mode is selected when the slic is adopted in a system using the ground start feature. in this mode the tip termination is set in high impedan- ce (100kohm) while the ring termination is acti- ve and fixed at vbat + 4.5v. in the case of con- nection of ring termination to gnd the sinked current is limited to 30ma. when ring is connec- ted to gnd both off-hook and ground-key detec- tors become active. power dissipation in this mode with a -48v battery voltage is 100mw (including the power dissipa- tion from +5/-5v supply). power down mode (pd) in this mode, both tip and ring terminations are open and no current is fed into the line. the power dissipation is very low. this mode is usually selected in emergency con- dition or when the connected line is disabled. this is also the mode into which the slic is auto- matically forced, in the case of thermal overload t j > 150 c typ. ringing mode (rng) when this mode is selected the ringing signal is injected on the line via the ext relay activated by the L3037 relay driver. when the ringing signal phase is provided at the rgin pin, the relay command is also synchroni- zed with the ringing signal zero crossing. the tip and ring termination of the L3037 are senses the line current which is then integrated on the crt capacitor. tip pin voltage is fixed at 2.5v, ring pin volt- age is fixed at v bat + 4.5v, tip, ring buffer cur- rent capability is limited to 100ma. when off-hook occurs during ringing burst the voltage on crt increase above a proper thre- shold and ring trip is detected. once ring trip is detected the ringing signal is automatically disconnected at the first zero cros- sing. when the ringing signal phase is not provi- ded at the rgin pin the ringing signal is discon- nected immediately after ring trip detection. external components list to set the slic into operation the following para- meters have to be defined: - the dc feeding resistance orfeedo defined as the resistance of the traditional feeding system (most common rfeed values are: 400, 800, 1000 ohm). - the ac slic impedance at line terminals ozso to which the return loss measurements is referred. it can be real (typ. 600ohm) or complex. - the equivalent ac impedance of the line ozlo used for evaluation of the trans-hybrid loss performance (2/4wire conversion). it is usu- ally a complex impedance. - the value of the two protection resistors rp in series with the line termination. - the line impedance at the ttx freq. zlttx. - the reverse polarity transition time defined as o d v tr / d to. once, the above parameters are defined, it is possible to calculate all the external components using the following table. the typical values has been obtained supposing: - rfeed = 400 w - zs = 600 w - zl = 600 w -rp=40 w - zlttx = 216 w + 120nf @ 12khz - re[zlttx] = 216 w - im[zlttx] = -110 w @12khz - d v tr / d t = 4250[v/s] control interface inputs operating mode outputs d0 d1 gst lim odet ogk 0 1 1 1 1 0 0 0 0 1 1 0 0 1 0 1 0 0 1 0 1 0 1 1 x x x x (*) x (*) x x x power down standby d. p. standby r. p. active d. p. active r. p. ring a. open reserved disable off/hk off/hk off/hk off/hk ring-trip off/hk disable gdkey gdkey gdkey gdkey disable gdkey (*) lim = 0 i lim = 25ma; lim = h. i. (open) i lim = 44ma; lim = 1 i lim = 55ma. L3037 7/22
external components name function formula typ. value cvb battery filter 330nf 20% 63vi cvdd positive supply filter 100nf 20% cvss negative supply filter 100nf 20% rref internal current reference 23.7k 1% csvr battery ripple rejection csvr = 1/(6.28 * fp * 150k) @ fp = 1.6hz 680nf 20% 60vi crt ring trip & ground-key capacitor crt = (25/f ring ) ? 390nf 390nf 20% 6vi rdc dc feeding resistance rdc = 10 * (rfeed - 2rp) 3.2k 1% cac ac/dc splitter cac = 1 / (6.28 * fsp * rdc) @ fsp = 10hz 4.7 m f 20% 15vi rs protection resistor image rs = 50 * 2rp 4k 1% zac 2 wire ac impedance zac = 50 * (zs-2rp) 26k 1% za (1) slic impedance balancing network za = 50 * (zs-2rp) 26k 1% ra (1) slic impedance balancing network ra = 50 * 2rp 4k 1% zb (1) line impedance balancing network zb = 50 * zl 30k 1% ccomp ac feedback compensation ccomp = 1 / [2 p fo (100 rp)] @ fo = 250khz 220pf 20% ch (1) trans-hybrid loss frequency compensation ch = ccomp 220pf 20% rf feeding resistance for ring inj. 200 w (7) 200 w 2w rt feeding resistance for ring inj. 200 w (7) 200 w 2w rrg ring input resistor rrg = (v ring /25 m a)cos[-2 ? f ring ? t ? 180] (4) crg ring input capacitor crg = 25 m a/(v ring ? sin[2 ? f ring ? t ? 180] ? 2 p f ring ) (4) 3.9nf 20% 100v ptc (2) positive temp. coeff. resistor < 15 w 10 w rst (2) tip buffer sensing resistor 10 to 50k w 33k 1w 5% (6) rsr (2) ring buffer sensing resistor 10 to 50k w 33k 1w 5%(6) qext external transistor (3) (*) rp protection resistor 30 to 80 w (8) 40 w rttx teletax cancellation resistor rttx = 21.5 ? [re (zlttx) +2rp] (5) 6.34k 1% cttx teletax cancellation capacitor cttx = 1/(21.5 ? [im(zlttx) ? fttx ? 6.28]) (5) 5.6nf 20% d1 relay kickback clamp diode 1n4148 crev polarity reversal transition time programming crev = k d v tr M d t ;k=2 ? 10 -4 47nf notes: (1) these components can be removed and zb pin shorted to gnd when 2/4wire conversion is implemented with 2nd generation combo (eg. ts5070fn) (2) in case there is no necessity to recover the unbalance introduced by ptc tolerance pins tip and stip can be shorted togheter as pins ring and sring. in this case also the r p resistor should be splitted in two parts keeping at least 20 w between tip/ring terminals and protection connection. in this case ptc or fuse resistor (if used) can be placed in series to rp. (3) transistor characteristic: p diss = 1w (typ. depending on application); h fe 25; i c 100ma; v ceo 60v; f t 15mhz. (4) v ring : max ring generator voltage, f ring : ring frequency, t: relay response time. typical value obtained for v ring = 100vrms, f ring = 25hz; t = 2.5ms. (5) defining rttx + cttx = zttx, rttx and cttx can also be calculated from the following formula: z fttx = 21.5 [zlttx + 2rp]. (6) rst and rsr wattage should be calculated according to the power cross test specification. (when ptc become open circuit the entire power cross voltage will appear across rsr and rst). (7) in order to optimize the component count it is also possible to use only one resistor in series to the ringing generator. in this case rt = 0 w ; rf 400 w (rf typ. value = 400 w ). (8) suggested rp type are 2w wire wound resistors or thick film resistors on ceramic substrate. fuse function should be included if ptc are not used. (*) ex: bd140; mje172;mje350....(st32 or sot82 package available also for surface mount). for low power application (reduced battery voltage) bcp53 (sot223 surface mount package) can be used. 4m w 5% L3037 8/22
figure 3: typical application circuit including all features. figure 4: typical application circuit with minimum components count (no rev. polarity nottx/no zero crossing sync/no ptc mismatch compensation). 680nf 680nf L3037 9/22
in case of u.s. application based on l3035 the external components can be calculated suppo- sing: - rfeed = 400 w - zs = 900 w + 2.12 m f - zl = 1650 w // (100 w + 5nf) loaded line - zl = 800 w // (100 w + 50nf) not loaded line -rp=62 w external components (for us. application) name function formula typ. value cvb battery filter 330nf 20% 63vi cvdd positive supply filter 100nf 20% cvss negative supply filter 100nf 20% rref internal current reference 23.7k 1% csvr battery ripple rejection csvr = 1/(6.28 * fp * 150k) @ fp = 1.6hz 680nf 20% 60vi crt ring trip & ground-key capacitor crt = (25/f ring ) ? 390nf 390nf 20% 6vi rdc dc feeding resistance rdc = 10 * (rfeed - 2rp) 2.76k 1% cac ac/dc splitter cac = 1 / (6.28 * fsp * rdc) @ fsp = 10hz 4.7 m f 20% 15vi rs protection resistor image rs = 50 * 2rp 6.2k 1% zac 2 wire ac impedance zac = 50 * (zs-2rp) (7) 39k + (180k//55nf) za (1) slic impedance balancing network za = 50 * (zs-2rp) (7) 39k + (180k//55nf) ra (1) slic impedance balancing network ra = 50 * 2rp 6.2k 1% zb (1) line impedance balancing network zb = 50 * zl 82.5k + (5k + 100pf) (3) 40k + (5k + 1nf) (4) ccomp ac feedback compensation ccomp = 1 / [2 p fo (100 rp)] @ fo = 250khz 100pf 20% ch (1) trans-hybrid loss freq. comp. ch = ccomp 100pf 20% rf feeding resistance for ring inj. 200 w (9) 200 w 2w rt feeding resistance for ring inj. 200 w (9) 200 w 2w rrg ring input resistor rrg = (v ring /25 m a)cos[-2 ? f ring ? t ? 180] (6) crg ring input capacitor crg = 25 m a/(v ring ? sin[2 ? f ring ? t ? 180] ? 2 p f ring (6) 3.9nf 20% 100v ptc (2) positive temp. coeff. resistor < 15 w 10 w rst (2) tip buffer sensing resistor 10 to 50k w 33k 1w 5%(8) rsr (2) ring buffer sensing resistor 10 to 50k w 33k 1w 5%(8) qext external transistor (5) (*) rp protection resistor 30 to 80 w (10) 62 w d1 relay kickback clamp diode 1n4148 notes: (1) these components can be removed and zb pin shorted to gnd when 2/4wire conversion is implemented with 2nd generation combo (eg. ts5070fn) (2) in case there is no necessity to recover the unbalance introduced by ptc tolerance pins tip and stip can be shorted togheter as pins ring and sring. in this case also the r p resistor should be splitted in two parts keeping at least 20 w between tip/ring terminals and protection connection. in this case ptc or fuse resistor (if used) can be placed in series to rp. (3) loaded line. (4) not loaded line. (5) transistor characteristic: p diss = 1w (typ. depending on application); h fe 25; i c 100ma; v ceo 60v; f t 15mhz. (6) v ring : max ring generator voltage, f ring : ring frequency, t: relay response time. typical value obtained for v ring = 100vrms, f ring = 25hz; t = 2.5ms. (7) for details see an496. (8) rst and rsr wattage should be calculated according to the power cross test specification. (when ptc become open circuit the entire power cross voltage will appear across rsr and rst). (9) in order to optimize the component count it is also possible to use only one resistor in series to the ringing generator. in this case rt = 0 w ; rf 400 w (rf typ. value = 400 w ). (10) suggested rp type are 2w wire wound resistors or thick film resistors on ceramic substrate. fuse function should be included if ptc are not used. (*) ex: bd140; mje172;mje350....(sot32 or sot82 package available also for surface mount). for low power application (reduced battery voltage) bcp53 (sot223 surface mount package) can be used. 4m w 5% L3037 10/22
electrical characteristics test condition, unless otherwise specified: v cc = 5v; v ss = -5v; v bat = -48v; agnd = bgnd; direct polarity; t a =25 c. note: testing of all parameters is performed at 25 c. characterization as well as the design rules used allow correlation of tested performances at other temperatures. all parameters listed here are met in the range 0 c to +70 c. functionality between -40 c and 85 c is verified. symbol parameter test condition min. typ. max. unit interface requirements 2 wire port v ab overload level voice signal rp +ptc = 50 w 300hz to 3.4khz (*) 4.1 vpk z ll long input impedance at slic terminals per wire 10 w i ll long current capab. ac standby per wire (on hook) 17 mapk active per wire (on hook) 17 mapk i ll longitudinal current capability active per wire off hook (it = transversal current) 75-i t mapk 4 wire trans port v tx overload level 1.8 vpk v toff output offset voltage -350 +350 mv z tx output impedance 10 w (*) at tip/ring line connection with z line (ac) = 600 w . for any dc loop current from 0ma to i lim figure 5: typical application circuit for u.s. application. 680nf L3037 11/22
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit 4 wire receive port z rx input impedance 100 k w v rx overload level 3.2 vpk metering input port z min input impedance 100 k w logic control port input d0, d1, gst v ih input high voltage 2 v v il input low voltage 0.8 v i ih input high current -10 90 m a i il input low current -10 10 m a c in input capacitance 10 pf input lim v ih input high voltage 2.4 v v il input low voltage 0.4 v i ih input high current -10 30 m a i il input low current -30 10 m a c in input capacitance 10 pf output det v ol output low voltage i o = 2ma 0.4 v v oh output high voltage i o =30 m a i o 10 m a 2.4 3.8 v v c ld load capacitance 150 pf ringing input port overload level -0.5 0.5 v input impedance 50 90 k w offset voltage allowed -15 15 mv transmission performance arl return loss (2-wire) 300hz to 3.4khz 22 db thl transhibrid loss 300hz to 3.4khz 20log 10 ? v rx v tx ? 30 db longitudinal balance (ccitt rec.0.121) l-t longit to transversal 300hz to 3.4khz z s = 600 w r p =40 w , 1% tolerance 52 db l-4 long sign rejection 58 db t-l transvers to longit 49 db 4-l long sign generation 49 db selected L3037 longitudinal balance (ieee std 455-1976) l t longitudinal to transversal 300hz to 3.4khz z s = 900 w + 2.12 m f r p =62 w , 1% match 58 63 db l 4 longitudinal signal rejection 70 db L3037 12/22
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit insertion loss g t transmit v gain 0dbm, 1khz -6.22 -5.82 db g r receive v gain -0.2 0.2 db insertion loss vs. frequency (rel 1khz / 0dbm) g t transmit v gain 0.3 to 3.4khz -0.1 0.1 db g r receive v gain -0.1 0.1 db metering injection g ttx transfer gain v ttxin = 0.66vrms z l =200 w ; 2 ? r p =80 w ;v moff =0 3.18 3.51 thd harmonic distortion 5 % gain linearity (rel 1khz, -4dbm) g t transmit v gain -55dbm to 7dbm (1) -0.1 0.1 db g r receive v gain -0.1 0.1 db group delay (2-4, 4-2) 0dbm t gabs absolute 3khz 5 m s t gdis 4 to 2-wire 0.5 to 3,4khz 5 m s tot harmonic distortion thd4 2 to 4-wire 7dbm, 0.3 to 3.4khz -46 db thd2 4 to 2-wire -46 db idle channel noise vabp 2-wire port psophometric -78 -72 dbmp vtxp 4-wire transmit psophometric -82 -76 dbmp vabc 2-wire port c message 12 18 dbr nc vtxc 4-wire transmit c message 8 14 dbr nc ringing function 0 cross zero crossing threshold level f ring = 16 to 66hz r gin = 3vrms -70 70 mv i rt ring trip threshold 7.5 ma dc t rtd ring trip detection time r l = 1.8k, f ring = 25hz 150 ms battery feed characteristic power down state i lgnd loop current tip or ring to bgnd 0.5 ma i lbat loop current tip or ring to v bat 0.5 ma i l loop current r l =0 1 ma stand by state i l iloop accuracy constant region 13 16 ma v los line voltage @ i l = 0 40 42 v active state v lo line voltage @ i l = 0 34.5 37.5 v r feed feeding resistance accuracy -10 +10 % i lim loop current limit accuracy i lim = 25ma, 44ma, 55ma -8 i lim +8 % ground start state z tip tip lead impedance 100 k w i gs ring lead current ring to gnd 30 ma (1) for level lower than -40db guaranteed by correlation. L3037 13/22
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit detectors off hook detector i det off-hook current threshold stand by state 9 12 ma i det off-hook current threshold active state 9 12 ma hys off-hook / on-hook hysteresys both stand by and active state 1 1.6 ma td dialling distortion active state -1 1 ms ground key detector i ll ground key current threshold i ll =(i b -i a) /2 tip to ring to gnd or ring to gnd 4ma power dissipation on L3037 at v bat = 48v p d power down any line lenght 38 mw p d stand-by 2-wire open r l = 0 to 2k 95 136 250 mw mw p d active, r feed = 800 w i lim = 25ma i lim = 44ma i lim = 55ma 2-wire open r l = 0 to 2k r l = 0 to 2k r l = 0 to 2k 155 224 710 1730 2660 mw mw mw mw p d active, rfeed = 400 w i lim = 25ma i lim = 44ma i lim = 55ma 2-wire open r l = 0 to 2k r l = 0 to 2k r l = 0 to 2k 155 224 510 870 1280 mw mw mw mw p d active ground key 1500 mw power dissipation on qext at v bat = 48v p dq active, r feed = 800 w i lim = 25ma i lim = 44ma i lim = 55ma r l = 0 to 2k r l = 0 to 2k r l = 0 to 2k 880 810 420 mw mw mw p dq active, rfeed = 400 w i lim = 25ma i lim = 44ma i lim = 55ma r l = 0 to 2k r l = 0 to 2k r l = 0 to 2k 1080 1610 1670 mw mw mw supply currents analog supply i cc v cc power down 1.5 2.2 ma i ss v ss power down 0.1 0.5 ma i cc v cc stand-by / a open 4 5 ma i ss v ss stand-by / a open 1.5 3 ma i cc v cc active 6 10 ma i ss v ss active 3 6 ma battery supply i bat power down a or b to bgnd 120 500 m a i bat stand-by 2-wire open 1.4 2 ma i bat active 2-wire open 2-wire r l = 400 w 2.3 3 i loop +5 ma ma L3037 14/22
figure 6: test circuit electrical characteristics (continued) symbol parameter test condition min. typ. max. unit power supply rejection (v ripple = 100mvrms) line terminals psrr v cc ref to agnd 50hz to 3.4khz 20 db psrr v ss ref to agnd 20 db psrr v bat ref to agnd 30 db psrr bgnd ref to agnd 20 db relay driver i rd current capability 40 ma v voltage drop @i rd = 40ma 1.25 v i lk off leakage current 100 m a 680nf L3037 15/22
figure 7: typical application with 2nd generation combo (600 w application) 680nf L3037 16/22
figure 8: typical application with 1st generation combo (600 w application) 680nf L3037 17/22
figure 9: typical application with 2nd generation combo (u.s. application) 680nf L3037 18/22
figure 10: typical application with 1st generation combo (u.s. application) 680nf L3037 19/22
plcc44 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 17.4 17.65 0.685 0.695 b 16.51 16.65 0.650 0.656 c 3.65 3.7 0.144 0.146 d 4.2 4.57 0.165 0.180 d1 2.59 2.74 0.102 0.108 d2 0.68 0.027 e 14.99 16 0.590 0.630 e 1.27 0.050 e3 12.7 0.500 f 0.46 0.018 f1 0.71 0.028 g 0.101 0.004 m 1.16 0.046 m1 1.14 0.045 L3037 20/22
pqfp44(10 x 10) package mechanical data dim. mm inch min. typ. max. min. typ. max. a 2.45 0.096 a1 0.25 0.010 a2 1.95 2.00 2.10 0.077 0.079 0.083 b 0.30 0.45 0.012 0.018 c 0.13 0.23 0.005 0.009 d 12.95 13.20 13.45 0.51 0.52 0.53 d1 9.90 10.00 10.10 0.390 0.394 0.398 d3 8.00 0.315 e 0.80 0.031 e 12.95 13.20 13.45 0.510 0.520 0.530 e1 9.90 10.00 10.10 0.390 0.394 0.398 e3 8.00 0.315 l 0.65 0.80 0.95 0.026 0.031 0.037 l1 1.60 0.063 k0 (min.), 7 (max.) a a2 a1 b seating plane c 11 12 22 23 33 34 44 e3 d3 e1 e d1 d e 1 k b pqfp44 l l1 0.10mm .004 L3037 21/22
information furnished is believed to be accurate and reliable. however, sgs-thomson mi croelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. sgs- thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics printed in italy all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. L3037 22/22

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