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 PROGRAMMABLE TRANSITION TIME (3 to 100ms) METERING PULSE INJECTION AND FILTERING WITH MINIMAL COMPONENTS COUNT (NO TRIMMING REQUIRED). PROTECTION RESISTOR MISMATCH COMPENSATION ON HOOK TRANSMISSION LOOP START/GROUND START FEATURE IND TEMP. RANGE: -40°C TO +85°C LOW POWER DISSIPATION IN ALL OPERATING MODES INTEGRATED ZERO CROSSING RELAY DRIVER INTEGRATED (NOISE-LESS) RING TRIP DETECTION VERY LOW NO. of STD TOLERANCE EXTERNAL COMPONENTS SELECT PART FOR U.S. APPLICATIONS (63dB TYP. LONG. BALANCE) SURFACE MOUNT PACKAGE (PLCC44 or BLOCK DIAGRAM December 1997 PLCC44 PQFP44(10 x 10) ORDERING NUMBERS: L3037FN L3037QN PQFP44) INTEGRATED THERMAL PROTECTION PIN TO PIN COMPATIBLE WITH L3035/36 DESCRIPTION The L3037 subscriber line interface circuit is a bipolar device in 70V technology developed for central 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 transition time programming. The line polarity transition is not affecting the AC signal transmission that can continue also during the line voltage transition.L3037 is available in two different package options: PLCC44 and PQFP44 (10 x 10mm). 1/22 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. L3037 L3037 PIN FUNCTIONALITY (PLCC44) No. 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 Name VCC ILTF RDC CF BASE BGND VREG STIP TIP VB RING SRING CRT ODET RGIN OGK GST D1 D0 LIM VSS REL CREV GREL CAC RS ZB VB Tx Rx ZAC TTXIN RTTX ACFD AGND IREF Function 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 (-VBAT) 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 (-VBAT) 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 FUNCTIONAL DIAGRAM GREL REL CRT OGK RGIN STIP ICRT ODET ILT (IA+IB)/200 ILL (IA-IB)/200 IA 1 TIP D0 LOGIC INTERFACE & DECODER D1 GST LIM LINE STATUS ILT VREF ICRT 0 CROSS DETECT. IB -1 RING SRING LINE INTERFACE SUPERVISION COMMANDS (IA+IB)/200 AC+DC AC BGND DC TTXIN RX VREG ILTF BIAS 2.32 1 ZAC 1 REFERENCE & BIAS SWITCHING ZB TX D94TL136 2/22 1+ AC PROCESSOR ACFD RS DC PROCESSOR IREV CAC RTTX IREF VCC VSS AGND CREV VB RDC SUPPLY REGULATOR CF BASE L3037 AGND N.C. ACFD RTTX 41 IREF RDC 42 ILTF CF 43 VCC BASE 44 40 39 38 37 36 35 34 VB 1 33 TTXIN VREG 2 32 ZAC STIP 3 31 RX TIP 4 30 TX N.C. 5 29 N.C. N.C. 6 28 VB N.C. 7 27 N.C. RING 8 26 N.C. SRING 9 25 ZB N.C. 10 24 RS CRT 11 23 CAC 12 13 14 15 16 17 18 19 20 21 22 RGIN OGK GST D1 D0 LIM VSS REL CREV GREL PQFP44 ODET PLCC44 BGND PIN CONNECTION (Top view) D94TL129 ABSOLUTE MAXIMUM RATINGS Symbol Vbat VCC VSS Vag nd Vbgnd VREL Vdig Idig Tj Tstg Hu Parameter Battery Voltage Positive Supply Voltage (0 to 1ms) (continuous) Negative Supply Voltage (0 to 1ms) (continuous) Agnd Respect Bgnd (continuous) Ring Relay Supply Voltage Digital I/O D0, D1, GST, LIM, ODET, OGK Digital I/O D0, D1, GST, LIM, ODET, OGK Maximum Junction Temperature Storage Temperature Humidity Value -64 to VSS+0.5 -0.4 to +7 -0.4 to +5.5 -7 to +0.4 -5.5 to +0.4 -2 to +2 Unit V V V V V V 14 -0.4 to +5.5 -3 to +3 +150 -55 to +150 5 to 95 V V mA °C °C % Note: In case of power on, power failure or hot insertion with V DD, VSS present and Vbat floating the Absolute Maximum 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 V DD 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 Top Vag nd Vbgnd VCC VSS Vbat VREL Parameter Operating Temperature Range Difference between Agnd and Bgnd Positive Supply voltage Negative Supply Voltage Battery Voltage Ring Relay Supply Voltage Value -40 to +85 -2 to +2 Unit °C V +4.5 to +5.5 -5.5 to -4.5 -62 to -17 4 to 13 V V V V THERMAL DATA Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max. PLCC44 PQFP44 Unit 45 75 °C/W 3/22 L3037 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 VCC Positive Power Supply (+5V) 40 2 ILTF Transversal Line Current Image ((IA + IB) / 200) 41 3 RDC 42 4 CF 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 4 9 TIP A line termination output (IA 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 9 16 SRING 11 17 CRT 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 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 VSS Negative Power Supply (-5V) 20 26 REL Ring relay driver output 21 27 CREV 22 28 GREL 23 29 CAC AC feedback input (ACDC split capacitor is connected from this node to ILTF) 24 30 RS Protection resistors image (the image resistor is connected from this node to ACFD) 25 31 ZB 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) Rx buffer output (the AC impedance is connected from this node to ACFD) Input of A power amplifier (when no compensation of ext. ptc resistor mismatch is requested it must be shorted to the TIP lead). B line termination output (IB is the current sunk into this pin). Input of B power amplifier (when no compensation of ext. ptc resistor mismatch is requested it must be shorted to the RING lead). Ring trip and ground key capacitor A open command (when open is internally pulled down) 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. Ground reference for ring relay driver 32 39 ZAC 33 40 TTXIN Metering input port/Vdrop 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 IREF Voltage Reference Output N.C. Not connected 2,5 to 7, 10,26, 27, 29,36 4/22 DC feedback input (the RDC resistor is connected from this node to ILTF) Battery voltage ripple rejection (CSVR capacitor is connected from this node to BGND). – L3037 DESCRIPTION (continued) One special selection with high longitudinal balance 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 (programmable) COMBO this function can be implemented 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 summing node through TTXIN pin. Metering pulse filtering is performed by means of a simple RC network with standard tolerance components. 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 appications where it is important to optimize the battery voltage supply versus the signal swing. Effect of protection resistors mismatch are compensated by a feedback loop on the final stage allowing 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°C ambient 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 required 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 termination impedance is set by means of an external impedance which may be complex. The 2 to 4 wire conversion is provided by means of an external network. Such a network can be avoided in case of applications 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 dissipation 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 controlled by a 4bit logic interface, two additional detector outputs provide ground key detection and either 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 select 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 output buffers (TIP/RING) can sink or source up to 100mA each. In case of Ground key or line terminals 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 5/22 L3037 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 terminals 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 Figure 1: DC Characteristic in active mode Figure 2: Current vs. Loop Resistance. Rfeed = 2 x 200ohm, Lim. currents: 25, 43, 55mA In active mode the AC impedance at the line terminals 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 network Zs can be either a pure resistance or a complex impedance. This allows L3037 to meet different 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: 6/22 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 connected to GND. The -6dB TX gain of the L3037 allows 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 necessary, applied at the TTXIN input of the SLIC. A fixed transfer gain is provided for the metering signal. To avoid saturation in the 4-wire side a cancellation is provided in the 4-wire transmission path. Cancellation is obtained via an external RC network without the need for trimmed components. When the TTX function is not used TTXIN input should be connected to GND. Since this pin is directly connected to a summing node inside the SLIC any signal applied to the TTXIN is transferred 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 needed AC signal swing. In active mode, with a -48V battery voltage, the L3037 dissipate 150mW for its own operation (including 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 reduced 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 active. Signal transmission is not operating. In stand-by mode, with a -48V battery voltage, the L3037dissipates90mW typ. (including the power dissipationfrom a +5/-5V supply). Stand-by mode is usually selected when the telephone 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 currentin on-hook condition. L3037 CONTROL INTERFACE INPUTS D0 D1 GST LIM 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 OPERATING MODE POWER DOWN STANDBY D. P. STANDBY R. P. ACTIVE D. P. ACTIVE R. P. RING A. OPEN RESERVED OUTPUTS ODET OGK 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. 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 Impedance (100Kohm) while the RING termination is active and fixed at Vbat + 4.5V. In the case of connection of RING termination to GND the sinked current is limited to 30mA. When RING is connected to GND both off-hook and ground-key detectors become active. Power dissipation in this mode with a -48V battery voltage is 100mW (including the power dissipation 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 condition or when the connected line is disabled. This is also the mode into which the SLIC is automatically 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 synchronized 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 voltage is fixed at VBAT + 4.5V, TIP, RING buffer current capability is limited to 100mA. When off-hook occurs during ringing burst the voltage on CRT increase above a proper threshold and ring trip is detected. Once ring trip is detected the ringing signal is automatically disconnected at the first zero crossing. When the ringing signal phase is not provided at the RGIN pin the ringing signal is disconnected immediately after ring trip detection. EXTERNAL COMPONENTS LIST To set the SLIC into operation the following parameters 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 measurements is referred. It can be 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 usually 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 ”∆VTR/∆T”. 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 = 400Ω - Zs = 600Ω - Zl = 600Ω - Rp = 40Ω - Zlttx = 216Ω + 120nF @ 12KHz - Re[Zlttx] = 216Ω - Im[Zlttx] = -110Ω @12KHz - ∆VTR/∆T = 4250[V/s] 7/22 L3037 EXTERNAL COMPONENTS Name CVB CVDD CVSS RREF CSVR CRT RDC CAC RS ZAC ZA (1) RA (1) ZB (1) CCOMP CH (1) Function Battery Filter Positive Supply Filter Negative Supply Filter Internal Current Reference Battery Ripple Rejection Ring Trip & Ground-key Capacitor DC Feeding Resistance AC/DC Splitter Protection Resistor Image 2 Wire AC Impedance SLIC Impedance Balancing Network SLIC Impedance Balancing Network Line Impedance Balancing Network AC Feedback Compensation RF RT RRG Trans-hybrid Loss Frequency Compensation Feeding Resistance for Ring Inj. Feeding Resistance for Ring Inj. Ring Input Resistor CRG Ring Input Capacitor PTC (2) RST (2) RSR (2) QEXT Rp RTTX CTTX D1 CREV Positive Temp. Coeff. Resistor Tip Buffer Sensing Resistor Ring Buffer Sensing Resistor External Transistor (3) Protection Resistor Teletax Cancellation Resistor Teletax Cancellation Capacitor Relay Kickback Clamp Diode Polarity Reversal Transition Time Programming Formula Typ. Value 330nF 20% 63VI 100nF 20% 100nF 20% 23.7K 1% 680nF 20% 60VI 390nF 20% 6VI 3.2K 1% 4.7µF 20% 15VI 4K 1% 26K 1% 26K 1% 4K 1% 30K 1% 220pF 20% 220pF 20% CSVR = 1/(6.28 * fp * 150K) @ fp = 1.6Hz CRT = (25/fRING) ⋅ 390nF RDC = 10 * (Rfeed - 2Rp) CAC = 1 / (6.28 * fsp * RDC) @ fsp = 10Hz RS = 50 * 2RP ZAC = 50 * (Zs-2Rp) ZA = 50 * (Zs-2Rp) RA = 50 * 2Rp ZB = 50 * Zl CCOMP = 1 / [2Πfo (100 Rp)] @ fo = 250KHz CH = CCOMP ≥ 200Ω (7) ≥ 200Ω (7) RRG = (VRING/25µA)cos[-2⋅fRING ⋅ T ⋅ 180] (4) CRG = 25µA/(VRING ⋅ sin[2 ⋅ fRING⋅T ⋅ 180] ⋅ 2ΠfRING) (4) < 15Ω 10 to 50KΩ 10 to 50KΩ 200Ω 2W 200Ω 2W 4MΩ 5% 3.9nF 20% 30 to 80Ω (8) RTTX = 21.5 ⋅ [Re (Zlttx) +2Rp] (5) CTTX = 1/(21.5 ⋅ [–Im(Zlttx) ⋅ fttx ⋅ 6.28]) (5) CREV = K ∆VTR ⁄ ∆T 100V 10Ω 33K 1W 5% (6) 33K 1W 5%(6) (*) 40Ω 6.34K 1% 5.6nF 20% ; K = 2 ⋅ 10 -4 1N4148 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; V CEO ≥ 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: 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 = 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. (*) 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. 8/22 L3037 Figure 3: Typical Application Circuit including all features. 680nF Figure 4: Typical Application circuit with minimum components count (No Rev. polarity NoTTX/No zero crossing sync/no PTC mismatch compensation). 680nF 9/22 L3037 In case of U.S. application based on L3035 the external components can be calculated supposing: - Rfeed = 400Ω - Zs = 900Ω + 2.12µF - Zl = 1650Ω// (100Ω + 5nF) Loaded Line - Zl = 800Ω// (100Ω + 50nF) Not Loaded Line - Rp = 62Ω EXTERNAL COMPONENTS (for US. Application) Name CVB CVDD CVSS RREF CSVR CRT RDC CAC RS ZAC ZA (1) RA (1) ZB (1) CCOMP CH (1) RF RT RRG CRG PTC (2) RST (2) RSR (2) QEXT Rp D1 Function Battery Filter Positive Supply Filter Negative Supply Filter Internal Current Reference Battery Ripple Rejection Ring Trip & Ground-key Capacitor DC Feeding Resistance AC/DC Splitter Protection Resistor Image 2 Wire AC Impedance SLIC Impedance Balancing Network SLIC Impedance Balancing Network Line Impedance Balancing Network AC Feedback Compensation Trans-hybrid Loss Freq. Comp. Feeding Resistance for Ring Inj. Feeding Resistance for Ring Inj. Ring Input Resistor Ring Input Capacitor Positive Temp. Coeff. Resistor Tip Buffer Sensing Resistor Ring Buffer Sensing Resistor External Transistor (5) Protection Resistor Relay Kickback Clamp Diode Formula CSVR = 1/(6.28 * fp * 150K) @ fp = 1.6Hz CRT = (25/fRING) ⋅ 390nF RDC = 10 * (Rfeed - 2Rp) CAC = 1 / (6.28 * fsp * RDC) @ fsp = 10Hz RS = 50 * 2RP ZAC = 50 * (Zs-2Rp) (7) ZA = 50 * (Zs-2Rp) (7) RA = 50 * 2Rp ZB = 50 * Zl CCOMP = 1 / [2Πfo (100 Rp)] @ fo = 250KHz CH = CCOMP ≥ 200Ω (9) ≥ 200Ω (9) RRG = (VRING/25µA)cos[-2⋅fRING ⋅ T ⋅ 180] (6) CRG = 25µA/(VRING ⋅ sin[2 ⋅ fRING⋅T ⋅ 180] ⋅ 2ΠfRING (6) < 15Ω 10 to 50KΩ 10 to 50KΩ 30 to 80Ω Typ. Value 330nF 20% 63VI 100nF 20% 100nF 20% 23.7K 1% 680nF 20% 60VI 390nF 20% 6VI 2.76K 1% 4.7µF 20% 15VI 6.2K 1% 39K + (180K//55nF) 39K + (180K//55nF) 6.2K 1% 82.5K + (5K + 100pF) (3) 40K + (5K + 1nF) (4) 100pF 20% 100pF 20% 200Ω 2W 200Ω 2W 4MΩ 5% 3.9nF 20% (10) 100V 10Ω 33K 1W 5%(8) 33K 1W 5%(8) (*) 62Ω 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; V CEO ≥ 60V; fT ≥ 15MHz. (6) VRING: Max Ring Generator Voltage, f RING: Ring Frequency, T: relay response time. Typical value obtained for VRING = 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 = 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. (*) 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. 10/22 L3037 Figure 5: Typical Application Circuit for U.S. Application. 680nF ELECTRICAL CHARACTERISTICS TEST CONDITION, unless otherwise specified: VCC = 5V; VSS = -5V; VBAT = -48V; AGND = BGND; Direct Polarity; TA = 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 = 50Ω 300Hz to 3.4KHz (*) Zll Long Input Impedance at SLIC terminals per wire Ill Long Current Capab. ac Ill Longitudinal Current Capability 4.1 Vpk 10 Ω standby per wire (on HOOK) 17 mApk active per wire (on HOOK) 17 mApk active per wire off HOOK (IT = Transversal current) 75-IT mApk 4 WIRE TRANS PORT Vtx Overload Level 1.8 Vtoff Output Offset Voltage -350 Ztx Output Impedance Vpk +350 mV 10 Ω (*) At TIP/RING line connection with ZLINE (AC) = 600Ω. For any DC Loop current from 0mA to I LIM 11/22 L3037 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit 4 WIRE RECEIVE PORT ZRX Input Impedance 100 KΩ VRX Overload Level 3.2 Vpk 100 KΩ 2 V METERING INPUT PORT ZMIN Input Impedance LOGIC CONTROL PORT INPUT D0, D1, GST Vih Input High Voltage 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 0.4 V INPUT LIM Vih Input High Voltage Vil Input Low Voltage 2.4 V Iih Input high Current -10 30 µA Iil Input Low Current -30 10 µA C in Input Capacitance 10 pF 0.4 V OUTPUT DET Vol Output Low Voltage Io = 2mA V oh Output High Voltage Io = 30µA Io ≤10µA C ld Load Capacitance 2.4 3.8 V V 150 pF -0.5 0.5 V Input Impedance 50 90 KΩ Offset Voltage Allowed -15 15 mV RINGING INPUT PORT Overload Level TRANSMISSION PERFORMANCE Arl Return Loss (2-wire) 300Hz to 3.4KHz 22 dB Thl Transhibrid Loss 300Hz to 3.4KHz 30 dB 52 dB 58 dB 49 dB 49 dB 20log10 VRX VTX Longitudinal balance (CCITT Rec.0.121) L-T Longit to Transversal L-4 Long Sign Rejection T-L Transvers to Longit 4-L Long Sign Generation 300Hz to 3.4KHz ZS = 600Ω R P = 40Ω, 1% tolerance Selected L3037 Longitudinal balance (IEEE Std 455-1976) L–T Longitudinal to Transversal L –4 Longitudinal Signal Rejection 12/22 300Hz to 3.4KHz ZS = 900Ω + 2.12µF R P = 62Ω, 1% match 58 63 dB 70 dB L3037 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit INSERTION LOSS Gt Transmit V Gain Gr Receive V Gain 0dBm, 1KHz -6.22 -5.82 dB -0.2 0.2 dB -0.1 0.1 dB -0.1 0.1 dB VTTXIN = 0.66Vrms ZL =200Ω; 2 ⋅ RP = 80Ω; Vmoff = 0 3.18 3.51 -55dBm to 7dBm (1) INSERTION LOSS vs. FREQUENCY (rel 1KHz / 0dBm) Gt Transmit V Gain Gr Receive V Gain 0.3 to 3.4KHz METERING INJECTION GTTX Transfer Gain THD Harmonic Distortion 5 % -0.1 0.1 dB -0.1 0.1 dB GAIN LINEARITY (rel 1KHz, -4dBm) Gt Transmit V Gain Gr Receive V Gain 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 Thd2 4 to 2-wire 7dBm, 0.3 to 3.4KHz -46 dB -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 70 mV RINGING FUNCTION 0 cross IRT TRTD Zero Crossing Threshold Level fRING = 16 to 66Hz R GIN = 3Vrms -70 Ring Trip Threshold Ring Trip Detection Time 7.5 mA DC R L = 1.8k, fRING = 25Hz 150 ms mA BATTERY FEED CHARACTERISTIC POWER DOWN STATE ILGND Loop Current TIP or RING to BGND 0.5 ILBAT Loop Current TIP or RING to Vbat 0.5 mA IL Loop Current RL = 0 1 mA STAND BY STATE Il VLOS Iloop Accuracy constant region 13 16 mA Line Voltage @ IL = 0 40 42 V @ IL = 0 34.5 37.5 V ACTIVE STATE V LO Line Voltage R feed Feeding Resistance Accuracy Ilim Loop Current Limit Accuracy -10 Ilim = 25mA, 44mA, 55mA -8 Ilim +10 % +8 % GROUND START STATE ZTIP Tip Lead Impedance IGS Ring Lead Current 100 RING to GND KΩ 30 mA (1) For level lower than -40dB guaranteed by correlation. 13/22 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 4 mA 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 Pd 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 Vbat = 48V P dq 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 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 mA SUPPLY CURRENTS ANALOG SUPPLY ICC VCC Power Down 1.5 2.2 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 14/22 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 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit POWER SUPPLY REJECTION (VRIPPLE = 100mVrms) LINE TERMINALS PSRR VCC ref to AGND PSRR PSRR PSRR 50Hz to 3.4KHz 20 dB VSS ref to AGND 20 dB Vbat ref to AGND 30 dB BGND ref to AGND 20 dB RELAY DRIVER iRD Current Capability V Voltage Drop iLK Off Leakage Current 40 mA @IRD = 40mA 1.25 V 100 µA Figure 6: Test Circuit 680nF 15/22 L3037 680nF Figure 7: Typical Application with 2nd Generation COMBO (600Ω Application) 16/22 L3037 680nF Figure 8: Typical Application with 1st Generation COMBO (600Ω Application) 17/22 L3037 680nF Figure 9: Typical Application with 2nd Generation COMBO (U.S. Application) 18/22 L3037 680nF Figure 10: Typical application with 1st Generation COMBO (U.S. Application) 19/22 L3037 PLCC44 PACKAGE MECHANICAL DATA mm DIM. 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 E 0.68 14.99 0.027 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 20/22 inch 0.101 0.004 M 1.16 0.046 M1 1.14 0.045 L3037 PQFP44(10 x 10) PACKAGE MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. A MIN. TYP. MAX. 2.45 A1 0.25 A2 1.95 B 0.096 0.010 2.00 2.10 0.077 0.079 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 0.083 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 L 0.65 0.315 0.80 L1 0.95 0.026 0.031 1.60 0.037 0.063 K 0°(min.), 7°(max.) D D1 A A2 D3 A1 23 33 22 34 0.10mm .004 44 B E E1 B E3 Seating Plane 12 11 1 C L L1 e K PQFP44 21/22 L3037 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. SGSTHOMSON 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. 22/22