L3037

L3037 STMICROELECTRONICS | Alldatasheet

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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- GRAMMABLETRANSITION 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

0 CROSS

DETECT. CRTRELGREL RGIN ILT ILL (IA+IB)/200 (IA-IB)/200 IA IB (IA+IB)/200 AC+DC AC SUPPLY REGULATORIREV DC REFERENCE BIAS SWITCHING 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 BIAS D94TL136 L3037 FUNCTIONAL DIAGRAM L3037 PIN FUNCTIONALITY (PLCC44) No. Name Function 10 to14 32 to 36 V CC ILTF RDC CF BASE BGND VREG STIP TIP VB RING SRING CRT ODET RGIN OGK GST LIM VSS REL CREV GREL CAC RS ZB VB Tx Rx ZAC TTXIN RTTX ACFD AGND IREF 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

PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vbat Battery Voltage -64 to V SS +0.5 V VCC Positive Supply Voltage (0 to 1ms) (continuous) -0.4 to +7 -0.4 to +5.5 V V VSS Negative Supply Voltage (0 to 1ms) (continuous) -7 to +0.4 -5.5 to +0.4 V V Vagnd - Vbgnd Agnd Respect Bgnd (continuous) -2 to +2 V VREL Ring Relay Supply Voltage 14 V Vdig Digital I/O D0, D1, GST, LIM, ODET, OGK -0.4 to +5.5 V Idig Digital I/O D0, D1, GST, LIM, ODET, OGK -3 to +3 mA Tj Maximum Junction Temperature +150 °C Tstg Storage Temperature -55 to +150 °C Hu Humidity 5 to 95 % Note:In case of power on, power failure or hot insertion with VDD ,VSS present and Vbatfloatingthe AbsoluteMaximum Ratings can be exceeded with Vbat > VSS +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 VDD and VSS or connecting one shottky diode (e.g. BAT49X or equivalent) between Vbat and VSS . One diode can be shared between all the SLICs of the same line card. OPERATING RANGE Symbol Parameter Value Unit Top Operating Temperature Range -40 to +85 °C Vagnd - Vbgnd Difference between Agnd and Bgnd -2 to +2 V VCC Positive Supply voltage +4.5 to +5.5 V VSS Negative Supply Voltage -5.5 to -4.5 V Vbat Battery Voltage -62 to -17 V VREL 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 18 19 20 21 22 44 43 42 41 39 40 38 37 36 35 34 N.C. N.C. TIP VREG VB STIP CRT N.C. SRING N.C. RING ODET RGIN OGK GST LIM VSS 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

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 ((IA +IB ) / 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 ZB is connecetd from this node to AGND. The ZA impedance is connected from this node to ZAC ) 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

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 nodethrough 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°Ca m - bient temperaturerange. 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) StandbyMode (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

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 ”Rfeed” 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 ”Zs” to which the return loss measurementsis referred. It canbe real (typ.600ohm)or complex. - The equivalent AC impedance of the line ”Zl” 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 ”ΔV TR /ΔT”. Once, the above parameters are defined, it is possible to calculate all the external components using the following table. The typical values has been obtainedsupposing: - Rfeed = 400Ω - Zs = 600Ω - Zl = 600Ω -R p=4 0Ω - Zlttx = 216Ω + 120nF @ 12KHz - Re[Zlttx] = 216Ω - Im[Zlttx] = -110Ω @12KHz -ΔV TR /ΔT = 4250[V/s] CONTROL INTERFACE INPUTS OPERATING MODE OUTPUTS D0 D1 GST LIM ODET OGK 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→ Ilim= 25mA; LIM = H. I. (open)→ Ilim= 44mA; LIM = 1→ Ilim= 55mA. L3037

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 4.7µF 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 Π fo (100 Rp)] @ fo = 250KHz 220pF 20% CH (1) Trans-hybrid Loss Frequency Compensation CH = CCOMP 220pF 20% RF Feeding Resistance for Ring Inj. ≥ 200Ω (7) 200 Ω 2W RT Feeding Resistance for Ring Inj. ≥ 200Ω (7) 200 Ω 2W RRG Ring Input Resistor RRG = (V RING /25µA)cos[-2⋅fRING ⋅T ⋅ 180] (4) CRG Ring Input Capacitor CRG = 25 µA/(VRING ⋅sin[2⋅ fRING ⋅T ⋅ 180]⋅ 2Π fRING ) (4) 3.9nF 20% 100V PTC (2) Positive Temp. Coeff. Resistor < 15 Ω 10Ω RST (2) Tip Buffer Sensing Resistor 10 to 50K Ω 33K 1W 5% (6) RSR (2) Ring Buffer Sensing Resistor 10 to 50K Ω 33K 1W 5%(6) QEXT External Transistor (3) (*) Rp Protection Resistor 30 to 80 Ω (8) 40 Ω 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 ΔVTR ⁄ΔT ;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 RP Resistor should be splitted in two parts keeping at least 20Ω 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: PDISS = 1W (typ. depending on application); hFE ≥ 25; IC ≥ 100mA; VCEO ≥ 60V; fT ≥ 15MHz. (4) VRING : Max Ring Generator Voltage, fRING : Ring Frequency, T: relay response time. Typical value obtained for VRING = 100Vrms, fRING = 25Hz; T = 2.5ms. (5) Defining RTTX + CTTX = ZTTX, RTTX and CTTX can also be calculated from the following formula: ZFTTX = 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 = 0Ω ; RF ≥ 400Ω (RF typ. value = 400Ω ). (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. For low power application (reduced battery voltage) BCP53 (SOT223 surface mount package) can be used. 4M Ω 5% L3037

In case of U.S. application based on L3035 the external components can be calculated suppo- sing: - Rfeed = 400Ω - Zs = 900Ω + 2.12µF - Zl = 1650Ω // (100Ω + 5nF) Loaded Line - Zl = 800Ω // (100Ω + 50nF) Not Loaded Line -R p=6 2Ω 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 4.7µF 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) CCOMP AC Feedback Compensation CCOMP = 1 / [2 Π fo (100 Rp)] @ fo = 250KHz 100pF 20% CH (1) Trans-hybrid Loss Freq. Comp. CH = CCOMP 100pF 20% RF Feeding Resistance for Ring Inj. ≥ 200Ω (9) 200 Ω 2W RT Feeding Resistance for Ring Inj. ≥ 200Ω (9) 200 Ω 2W RRG Ring Input Resistor RRG = (V RING /25µA)cos[-2⋅fRING ⋅T ⋅ 180] (6) CRG Ring Input Capacitor CRG = 25 µA/(VRING ⋅sin[2⋅ fRING ⋅T ⋅ 180]⋅ 2Π fRING (6) 3.9nF 20% 100V PTC (2) Positive Temp. Coeff. Resistor < 15 Ω 10Ω RST (2) Tip Buffer Sensing Resistor 10 to 50K Ω 33K 1W 5%(8) RSR (2) Ring Buffer Sensing Resistor 10 to 50K Ω 33K 1W 5%(8) QEXT External Transistor (5) (*) Rp Protection Resistor 30 to 80 Ω (10) 62 Ω 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 RP Resistor should be splitted in two parts keeping at least 20Ω 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: PDISS = 1W (typ. depending on application); hFE ≥ 25; IC ≥ 100mA; VCEO ≥ 60V; fT ≥ 15MHz. (6) VRING : Max RingGenerator Voltage, fRING : Ring Frequency, T: relay response time. Typical value obtained for VRING = 100Vrms, fRING = 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 = 0Ω ; RF ≥ 400Ω (RF typ. value = 400Ω ). (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. For low power application (reduced battery voltage) BCP53 (SOT223 surface mount package) can be used. 4M Ω 5% L3037

ELECTRICAL CHARACTERISTICS TEST CONDITION, unless otherwise specified: VCC = 5V; VSS = -5V; VBAT = -48V; AGND = BGND; Direct Polarity; TA =2 5°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 = 50Ω 300Hz to 3.4KHz (*)

4.1 Vpk

Zll Long Input Impedance at SLIC terminals per wire 10 Ω Ill Long Current Capab. ac standby per wire (on HOOK) 17 mApk active per wire (on HOOK) 17 mApk Ill Longitudinal Current Capability active per wire off HOOK (IT = Transversal current) 75-IT mApk

4 WIRE TRANS PORT

Vtx Overload Level 1.8 Vpk Vtoff Output Offset Voltage -350 +350 mV Ztx Output Impedance 10 Ω (*) At TIP/RING line connection with ZLINE (AC) = 600Ω . For any DC Loop current from 0mA to ILIM Figure 5:Typical Application Circuit for U.S. Application. 680nF L3037

ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit

4 WIRE RECEIVE PORT

ZRX Input Impedance 100 K Ω VRX Overload Level 3.2 Vpk METERING INPUT PORT ZMIN Input Impedance 100 K Ω LOGIC CONTROL PORT INPUT D0, D1, GST Vih Input High Voltage 2 V Vil Input Low Voltage 0.8 V Iih Input High Current -10 90 µA Iil Input Low Current -10 10 µA C in Input Capacitance 10 pF INPUT LIM Vih Input High Voltage 2.4 V Vil Input Low Voltage 0.4 V Iih Input high Current -10 30 µA Iil Input Low Current -30 10 µA C in Input Capacitance 10 pF OUTPUT DET Vol Output Low Voltage I o = 2mA 0.4 V V oh Output High Voltage I o =3 0µA Io ≤10µA 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 Ω 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 20log10  VRX VTX 30 dB Longitudinal balance (CCITT Rec.0.121) L-T Longit to Transversal 300Hz to 3.4KHz ZS = 600Ω R P =4 0Ω , 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 = 900Ω + 2.12µF R P =6 2Ω , 1% match 58 63 dB L – 4 Longitudinal Signal Rejection 70 dB L3037

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 ZL =200Ω ; 2 ⋅R P =8 0Ω ;Vmoff =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 TgABS Absolute 3KHz 5 µs TgDIS 4 to 2-wire 0.5 to 3,4KHz 5 µs 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 dBrnC Vtxc 4-wire transmit c message 8 14 dBrnC RINGING FUNCTION 0 cross Zero Crossing Threshold Level fRING = 16 to 66Hz R GIN = 3Vrms -70 70 mV IRT Ring Trip Threshold 7.5 mA DC TRTD Ring Trip Detection Time R L = 1.8k, fRING = 25Hz 150 ms BATTERY FEED CHARACTERISTIC POWER DOWN STATE ILGND Loop Current TIP or RING to BGND 0.5 mA ILBAT Loop Current TIP or RING to V bat 0.5 mA IL Loop Current R L =0 1 m A STAND BY STATE Il Iloop Accuracy constant region 13 16 mA VLOS 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 % Ilim Loop Current Limit Accuracy Ilim= 25mA, 44mA, 55mA -8 I lim +8 % GROUND START STATE ZTIP Tip Lead Impedance 100 K Ω IGS Ring Lead Current RING to GND 30 mA (1) For level lower than -40dB guaranteed by correlation. L3037

ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit DETECTORS OFF HOOK DETECTOR Idet Off-hook Current Threshold stand by state 9 12 mA Idet 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 ILL Ground Key Current Threshold ILL =( IB -IA) /2 TIP to RING to GND or RING to GND 4m A POWER DISSIPATION ON L3037 at VBAT = 48V Pd Power Down any line lenght 38 mW Pd Stand-by 2-wire open R L = 0 to 2K 95 136 250 mW mW Pd Active, Rfeed= 800Ω ILIM = 25mA ILIM = 44mA ILIM = 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 = 400Ω ILIM = 25mA ILIM = 44mA ILIM = 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 Pd Active Ground Key 1500 mW POWER DISSIPATION ON QEXT AT V bat= 48V P dq Active, Rfeed= 800Ω ILIM = 25mA ILIM = 44mA ILIM = 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 = 400Ω ILIM = 25mA ILIM = 44mA ILIM = 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 ICC VCC Power Down 1.5 2.2 mA ISS VSS Power Down 0.1 0.5 mA ICC VCC Stand-by / A open 4 5 mA ISS VSS Stand-by / A open 1.5 3 mA ICC VCC Active 6 10 mA ISS VSS Active 3 6 mA BATTERY SUPPLY Ibat Power down a or b to BGND 120 500 µA Ibat Stand-by 2-wire open 1.4 2 mA Ibat Active 2-wire open 2-wire RL = 400Ω 2.3 3 ILOOP +5 mA mA L3037

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 batref to AGND 30 dB PSRR BGND ref to AGND 20 dB RELAY DRIVER iRD Current Capability 40 mA V Voltage Drop @I RD = 40mA 1.25 V iLK Off Leakage Current 100 µA 680nF L3037

Figure 7:Typical Application with 2nd Generation COMBO (600Ω Application) 680nF L3037

Figure 8:Typical Application with 1st Generation COMBO (600Ω Application) 680nF L3037

Figure 9:Typical Application with 2nd GenerationCOMBO (U.S. Application) 680nF L3037

Figure 10:Typical application with 1st Generation COMBO (U.S. Application) 680nF L3037

PLCC44 PACKAGE MECHANICAL DATA DIM. mm inch 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

PQFP44(10 x 10) PACKAGE MECHANICAL DATA DIM. mm inch A 2.45 0.096 A1 0.25 0.010 B 0.30 0.45 0.012 0.018 c 0.13 0.23 0.005 0.009 D3 8.00 0.315 e 0.80 0.031 E3 8.00 0.315 L1 1.60 0.063 K0 °(min.), 7°(max.) A A1B Seating Plane C 2333 E D e K B PQFP44 L 0.10mm .004 L3037

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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