M88TDB7711-15

TDB7711 STMICROELECTRONICS | Alldatasheet

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Technical content

a ____ IST] SGS-THOMSON TDB7711 MICROELECTRONICS TDB7722 _ 7s Meee SUBSCRIBER LINE INTERFACE CIRCUIT KIT OO eee = PROGRAMMABLE DC FEEDING RESIS- TANCE AND LIMITING CURRENT (seven values) » LONGITUDINAL BALANCE PERFORMANCE : _ UP TO 63 dB _e = FOUR OPERATING MODES (power-down, Oo stand-by, conversation, ringing control) GaN = POWER SAVING FEATURE A = SIGNALLING FUNCTION (off-hook/ground key) = HYBRID FUNCTION = EXTERNAL RINGING ALLOWING BALANCED Multiwatt 15 AND UNBALANCED RINGING WITH ZERO CROSSING INJECTION AND RING TRIP DE- TECTION = AUTOMATIC RINGING STOP WHEN OFF- o HOOK |S DETECTED oR = » LOW POWER CURRENT CONSUMPTION IN Tie op ae STAND-BY MODE (90 mW) i aed « LOW NUMBER OF EXTERNAL COMPO- ¥ NENTS. THESE COMPONENTS REQUIRE ONLY STANDARD TOLERANCE : 1 % RESIS- b1p28 PLOC28 TORS AND 10-20 % CAPACITORS » POSSIBILITY TO WORK WITH HIGH COM- MON MODE CURRENTS : Ite oe NPUTIOUTPUT ORDER CODES : TD87722 (Multiwatt 15) = GENERAL PURPOSE BIT TDByrit (pLoces) » INTEGRATED THERMAL PROTECTION PIN CONNECTION i ns ea o E ¢ TDB7711 TDB7722 367

DESCRIPTION

The ST SLIC KIT (TDB7722/7711) is a set of solid The STSLICKIThas been designed to achieve per_ state devices designed to integrate the main func- formant transmission characteristics like excellent tions needed to interface a telephone line. longitudinal balance and very low consumption. Itconsists of2 integrated devices :the TDB7722IIne _In.addition, this kit controls an external ringing relay ittorabe circuit and the TDB7711 control unit. This With zero crossing injection. a kit performs main of the BORSHT functions : This kit is fabricated using a 80 V Bipolar, junction ~ Battery feed isolated technology, with accurate thin film resistors

7 Gvervoltage protection with double trisil device for the TDB7722 and a 10 V Bipolar I2L technology

and 2 protection resistors for TDB7711. - Ringing control This kit is suitable for all applications, C.O or PBX, = Signalling where balanced or unbalanced ringing are re- = Hybrid quested. ABSOLUTE MAXIMUM RATINGS = Vo Negative Battery Voltage 72 v Veo Positive Supply Voltage +55 v Vse Negative Supply Voltage -85 v Vagna:Vegne|_ Maximum Voltage Between Analog GND and Battery GND v T Maximum Junction Temperature + 150" Tag___| Storage Temperature = 55' to 150" c THERMAL DATA TDB7722 HIGH VOLTAGE Fine | Max Resistance Junction to Case 3 cw Rin _ | Max. Resistance Junction to Ambient 40 ‘cw TDB7711 LOW VOLTAGE [fine [Max Resistance Junction to Ambient 80 ow | OPERATING RANGE [Symbor [Characteristics | Min. ‘|| Typ, | Max. | Unit. ‘Operating Temperature Range 0 [70 c Negative Battery Voltage = 72 = 20 Vv Positive Supply Voltage +45 +55 Vv [Tine [Totaitine Curent a mv ane 88-THOMSON 368

(ow [WANE] DESCRIPTION

1 B Line Termination Output with Current Capability up to 120 mA (Ip is the current sunk into)

this pin). 2 CG; | Digital signal input (3 voltage levels) that defines device status with pin 3. Longitudinal current is also provided Ge | Digital signal input (3 voltage levels) that defines device status with pin 2. Thermal warning current is also provided by 1087722 through this pin. High precision scaled transversal line current signal. It is a current generator referred to AGND. Ir = la + lo 200 [5 | Ve | Negative Battery Supply Voltage. TIP | A Line Termination Output with Current Capability up to 120 mA (Ia is the current sourced from this pin). 7 Battery Ground Relative to Ve Supply Voltage. It is also the reference ground for TIP and RING signals. NC | Not connected, this pin is connected to internal circuitry and should not be used as a tigpoint for external circuitry. Vai | This voltage output provides Vper/40 Voltage to TDB7711 Vaer : Filtered Battery Voltage - (Vaar'-2.1 V) [10 | Aco | Analog ground, all input signals and Voo supply voltage must be referred to this pin

2 Wire Unbalanced Voltage input

Positive Power Supply + 5 V [13 | CF | Anexternal capacitor connected between this pin and BGND filters battery noise. 14__|_RR__| Ring relay driver : output used to drive a § V or 12 V external ring relay. 15 | RG _| Ring Relay Ground ge sts-tomson SE SYM facronectaomes 369

[Ww [ WaWE [SS scripiow Sd [17] naw — | Resaine Command oie Sarai Dial SUC Conta i [T2TT p10 | bata inputeuipt tor SUC Serial Conor [3 ae8 | General Purpose Bt. TTLICMOS Output Avalabe for any Specie Appeaion | CS [gr eae ieee | from TDB7722. | en recmesomiemems | input from TDB7722. C1 and C2 combination defines operating mode of the high voltage part. Ir Scaled down Transversal Line Current Input Ir =la + lp. Li” FS [Te [mene A0.06 Feedback np [Ts [moc | 0c Feeding Sytem SCS a A Le} renee in ae eee me we ene - DC voltage to perform the proper DC characteristic = Voice signal ~ Teletax C= ae | offering power saving capability. Also used to detect line short circuits. [Tao [Ree [Bis SetigPin 26 | BOND [OpisGomnd PS | 18

O—O—O fe O SUPPLY uBINO 14 FILTER RELAY O RR c2 0 CONTROL THERMAL i c1 oO INTERFACE PROTECTION . . ay INPUT oureut O TIP ving | 1: STAGE STAGE ORING — —- — CURRENT J | ITO SENSOR MBBT0B7722-81 TDB7711 BLOCK DIAGRAM upp USS REF CRT RING IR/1 18/2 C2 Ct 699 90 —0-—0 Fra) GE RING TRIP. | nu. cn Q a1as OETECTION INTERFACE 12 13 13 | 8 D 28 © enaaacteristics }— } ac/oc (nn 3 [| 14 zac © SYNTHESIS cac | : = — rx 6 Tx Toop SuPERUISION TIL/CMOS | Logic INTERFACE | aro INTERFACE i F oenener Gn 6 o—o od o cpa cik R/U CS. I/O GND I/D garg 11-01 G57 SES:THOMSON 518 SY4 icroescrnomce 371

TDB7722 - HIGH VOLTAGE CIRCUIT 2) The transmission characteristics of the SLIC are . the following The TDB7722 line interface providesabatteryfeed- | ing and drives a ring relay. : tonoitedindl canon ‘ection The TDB7722 contains a state decoder which is _ paved on TDB7722' informations and external under control of the low voltage TDB7711. This components configuration, the TDB7711 handles decoder sec : tional mode the impedance synthesis and hybrid balance = one of the following operational modes : power , : down, stand-by, conversation, ring relay control, 9) Signalling features are : power saving - teletax (shaping and filtering) - direct or reverse battery operation. (osctived in application note AN298) ~ ring trip detection The circuit makes the sum and difference of the two (deserved in application note AN298) wire currents (la, lb) to provide the transverse and - pulse dialing loniusnal components to the LV SLIC (Scaled —_- ground key detection jown : The scaled down transverse current flows by pin. 4) ba Iepatloatpu tin The scaled down longitudinal current flows by C1 (gaeoritedln analication note AN2SB) . a - | purpose bit In addition, TDB7722 provides thermal warning cur- general ‘ The TDB7722 amplifies both the AC andDC signals serial bus. i entering pin 11 (VIN). = thermal warning Separate grounds are provided : - analog ground as a reference for analog signals © WORKING STATES OF THE KIT ~battery ground as a reference forthe output stages in order to carry out the various operation modes, 1DB7711 - LOW VOLTAGE CIRCUIT the ST SLIC kit has several different working states. 1) The TOB7711 | " trol unit contro Each mode, externally selected by microcontroller, 1) The Tot low voltage control unit controls _ ig defined by the voltage respectively applied by pins 7722 line interface module, giving the proper and 4 of TDB771 1 to the pins 2 and 3 of TDB7722 informations to set line feed characteristics (drop Ty ig , nye voltage mode, feed resistance mode, current limita- ree different voltage levels (1.4 ; 0 ; + 1.4) are tion) for several working modes : available at each connection, defining all possible - apparent battery . states as listed in table 1 - real battery - special DC characteristic SS Appropriate combinations of two pins define the four The main difference between stand-by and power possible status of the kit, that are : down is that in SBY the power consumption on the a) Stand-by (SBY) voltage battery Ve~ (- 48 V) is reduced but the SLIC b) Conversation (CVS) can feed the line, recognize the on-hook, off-hook ©) Ringing (RING) status and ground key status. 8) Power down (PD) see scs-THoMson SYM waceexzer39¢8 374

In power down, the power consumption is closed to _cuit are not active in order to reduce the power con- zero, tip and ring terminals are in high impedance sumption and all ine detection circuits are disabled. ‘The only working functions are following: The SBY status should be used when thetelephone ; is in on-hook and PD status only in emergency con-__* Line feeding dition whenitis mandatory to cut any possible power —_- line voltage |Vbat| ~ 10 V dissipation with no running operation = current supplied to the line limited to 60 mA - output resistance = protection resistance OPERATION MODES me ° (®) STAND-BY (SBY) MODE. In this mode, most of the functions of both low voltage and high voltage cir- Nine -5amA SLOPE IS 2xRp a oo — aaa a | Veg. |-18uU Ug. 88708 7711-15 * Onioff hook detection The limiting current is defined by programmation via The current of the 2 wires are sensed and the scaled edicts interface and selected among the seven down transverse current is provided to low voltage ; Se or oneame cam 12 mA, 20 mA, 30 mA, 32 mA, 42 mA, 60 mA, 62 In this mode, the polarity of the battery should bedi-_) A standard resistive feeding mode rect (TIP wire more positive than RING one). The characteristic is : gsi VeaT minus a voltage equal to Riees x line with Ricea When the SLIC is set in SBY mode, the power dissi- pation of TDB7711/1DB7722 kit is 90 mW. fare by external resistor RDC (RDC = 2 (Rees CONVERSION (CVS) MODE. This operation mode _c) A nearly constant voltage mode is set when the off-hook condition has been recog: ‘The voltage value is |Vear| - 13 V. This 13 V drop nized. voltage allows the output amplifiers to keep a good , linearity. as far atioeing coulis one poodle three For |Vear|> 48+ 13 = 61 V, this mode does not exist. ng cone : The three different feeding conditions are applicable a) Current limiting region . oF not in the three different following feeding modes. The DC impedance of the SLIC is very high These three feeding modes are controlled by the (> 20 Kohms) and therefore the system works like two digital eight bits word writen in the low voltage a current generator. circuit. G57 SSS:THOMSON _ _918 ‘V4 incroscrromce —_ 375

1) Apparent Battery. rT I limit Rfeed agu Re Ves, f ee fy v B-13U In this mode, the three feeding conditions are available, the line sees an apparent voltage of 48 V whatever the actual battery voltage is. 2) Real Battery. 1 limit veer Ya-2.au Rea \\Os UREF we v g33u This solution is same as apparent battery except for Therefore the line voltage depends on the current the standard resistive mode where the voltage value battery voltage Ve. is |Mline\\ = |Vacr| — Rfeed x tline with [Vaee| = [Va-|- 2,1 V 3) Special Characteristic. t limit Rp eo a oe Q 130 [up naeT087711-08 jong SGS-THOMSON G7 SSaOMSEe 376

In this mode, there is no standard resistive feeding __the ringing generator. The ring relay is disenergi- region. This mode is specially suitable for PBX ap- Zed either when ring trip is detected or by softwa- plications. re, using one bit of the second byte written in the The three feeding modes above can operate either _SLIO (see page 18: data input). in normal polarity or in reverse polarity. There is a sophisticated ring trip detection circuitry : insensitive to parasitic noise on the line. The ring trip RINGING MODE (RING). When ringing, the SLIC principle is as follows : must be in normal battery mode. ‘ ; Anexternal circuit apples ringing signal through the the line current is sensed by a resistive network, ringing network and the ring relay not sensitive to longitudinal current. This circuit consists of a balanced or unbalanced 5 2raction of the ite ourrent ie sent in a capacitor sinus generator (70 to 100 VRMS) in serie with the luring one period of the ringing signal. battery (~ 48 V). - Vis measured at the beginning and at the end of When the ringing control is selected (by software), Me Period. ring relay is energized at the zero crossing point of 2 cases : 1) No Voltage Difference and Therefore No DC Component Exists in Line Current A. ‘ aa v : ' — : i ‘ 1 ' 1 ‘ ‘(MBBTOR77 11-89 2) Voltage Difference and Therefore a DC Component Exists in Line Current. ‘ — f ' , t ie v ' ' — \\ 1 ' ' i , | 1 ' ' ' I __ av ‘ 68T087711-18 mIgRSRaS NORICS 377

POWER DOWN MODE (PD). In case of overtem- sumptions very iow, the line drivers amplifiers (rip erature or on logic control (see page 13: data out- and RING) are set in high impedance state and can- pul) the high voltage SLIC TDB7722 can be set in not deliver any current. power down mode. In this case, the power con- DIGITAL CONTROL INTERFACE The programmable functions of the SLICare setby The datas are shifted into the low voltage TDB7711 the contunts oftwo 8-bits registers in the TDB7711 on the rising edge of each CLK pulse, if CS = 0 and (low voltage) chip. RW =1. Connection between TDB7711 and the card con- The datas are shifted out from TDB7711 on the ris- troller is realized through a 4-wire serial bus. ing edge of each CLK pulse, if CS = 0 and R/W = 0. , ; The first bit BO can even be read without any CLK iaehainnrenily functions : pulse, as soon as CS = 0 and RW = 0. CLK : Shift Clock (128 kHz max) This bit is read again, as BO, upon the first CLK ris- CS: Chip select (active low) ge of operat D/O : Bidirectional pin : data-in (2 bytes), data-out ing edge of a read operation. _ (12 bit word) When GS = 1, the DV/O pin is in high impedance, RW : Read (if "o") or write (if "1") allowing several SLICS to share the same data link. Data input Two bytes can be written into the SLIC to program its registers. 80 = 0 = First Byle Selected Late 2 BI = Standby 0 = Power up 1 = Standby B2 = Normai/Special Characteristic 0 =Normal 1 = Special B3 = Real/Apparent Battery 0 = Apparent 1 =Real _ _ B4 = Current Limitation 1 0=0mA Note 1 | eee ss 5M BS = Current Limitation 2 0=0mA Note 1 1=20mA | B 6 = Current Limitation 3 0=-0mA Note 1 ——— 1at2mMA B7 = Validation (0 = This word is not stored into the SLIC __ 1 = This word is stored into the SLIC on rising edge of CS_| Noles) 1 The current values can be added. Therefore seven values are available from 12 mA to 62 mA 2. The BO bit is always the fist bit shifted into or shifted out from the DVO pin, 3 the SLIC is sat in POWER DOWN mode if Bt = 1 and B4 = 85 = BB = 0. 1248 i THOMSON G7 Soto 378

BO = 1 = Second Byte Selected Note 7 B1 = General Purpose Bit 0 =Low Level Voltage on GPB Pin 1_=High Level Voltage on GPB Pin B2 = Analog Input/Output Pin 0 = Input Mode 1. = Output Mode B3 = Teletax 0 =Teletax Off 1 =Teletax On B4 = DirectReverse Battery 0 = Direct Battery 1_= Reverse Battery BS = Ringing 0 = Ringing Off 4.» Ringing On 86 = TTX Drop Voltage Variation 0 = Variation 1 =No Variation B7 = Validation 0 = This word is not stored into the SLIC _ 1 = This word is stored into the SLIC upon rising edge of CS Note: 1, The BO bitis always the first bit shifted into or shifted out from the DVO pin Data output One twelve bit word can be read from the SLIC. BO = Hook Status (HS) 0 = On Hook Status Note 1 1 = Off Hook B1 = Comparison Result Bit (CRB) 0 =Iline voltage! > voltage set on AV/O pin 1_=!line voltage! < voltage set on Al/O pin B2 = Ground Key (GK) {0 = No Ground Key 1 = Ground Key BS = Thermal Warning (TW) 0 = Normal 1 = HV Circuit Temperature > 150°C B4 to B11 = Last byte written into the SLIC for checking Note: 1. The BO bit is always the ist bit shifted into or shifted out from the DVO pin Reset : The logic circuitry is automatically reset at power on, or by hardware, when applying the Voo voltage on the TTX pin a G57 SSS:THomson 1318 SY incromcmomcs 379

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—$$ B71 1-TB7722 EXTERNAL COMPONENTS LIST TDB7722 (high voltage) Component 7 _ [eet [Vote Function RP > =30 OHMS 1BD7711 (low voltage) _ _ Component Ret Value Function

15.8 Kohms (1%) Bias Resistor _ _

[ oc [a8 ohms__ | eeding Bridge Resistor 47 w FIO V (20 %) AC Path Decoupling

27 Kohms (Z0 = 600 ohms) Scaled AC Impedance

| za | 60 Kohms (20 = 600 ohms) SLIC Impedance Balance Network 270 pFN0V (10%) 120 pFOV (10%) Ring Trip Capacitor Ri to R4 560 Kohms (5 %) Ae and 6 220 ohmala W Line Current Sensing During Ringing [_RRing | 270 Kohms (10 %) Ring Generator Zero Crossing Detection CRING 10 nF (20 %) Ring Generator Zero Crossing Detection Note: For external components definition, please refer to application note AN298- ELECTRICAL OPERATING CHARACTERISTICS The characteristics apply when the application diagram (see figure 1) has nominal value of typical external components and unless otherwise specified : Tam = 25 °C, Va =—30 to ~ 72 V, Vop = + 5V 45%, Ves =-5V 25% Transverse Line Current (I 7) = 30 mA LINE FEEDING CHARACTERISTICS Symbol] Parameter | Min. | Typ. | Max. | Unit. lim | Loop Current at Constant Current = Range 12 62 | mA Feed = Accuracy -0 +10 | % Ricea | Feed Resistance = Range 300 1000 Q = Accuracy -5 +5 %o Aoparent Batory Valage [-soa[ 40 [-a56| v_| ‘SGS-THOMSON 1518 381

ELECTRICAL OPERATING CHARACTERISTICS (continued) SIGNALLING Symbol] Parameter [_min. [ Typ. | Max. | Unit. | [i tot) | OF Rock DaecionTieshog ——PoweruperFowerDaws [5 | | _@ | ma | [icton)| On Hook Detector Trvesnolt Power up or Power Down | «| | 7 | ma | Tiaitws)[ OOnHookHysteess TS [ [Dang Dstonon | a ee ‘U7 = 20 mA Power Down [ice ori| Ground Key Deecion weaned SS a | ma |_| SngnterOneson evens toaing inoue | Tet | Time liu = 20 mA [Tq ten) Ring Wp DetetenTeahos ——SSSSC*d || | [Fa [Ringing Frequency 20 [Tring tri Dewy igs ema Sid as Pl ee ee F< 18 kHz

2 WIRE PORT TRANSMISSION

[Symbor[ Parameter Yin, [Typ Wan | Uni] oT a [___[terwretinpearce Re Spcion rassnce [10 | | e+ 10 | St Rp = Protection Resistance wire [secre SE ee Conversation Mode Oft-Hook F=3000Hz 53 58 On-Hook 200<F<3400 | 50 53 [_[oreeina Sigal Ganeraton100<F ©3400 | sa || | aa _| [[onotucinat Handing Capabiny as rar | 16/1. sete __ 7 spay,

ELECTRICAL OPERATING CHARACTERISTICS (continued)

4 WIRE PORT TRANSMISSION

Symbol[ Parameter | Min. | Typ. | Max. | unit. | Overload Level On AX dBm On TX dBm [Fire oupat onset Vorage 0] | Zrx [Tx Outputimpedance Tt | | Gax_| AX to Line Gain F=1020Hz,Vax=-0dBm | -0.15| 0 | 016 | dB | |_Grx_| Line to TX Gain Vix=od5m |-015 | 0 | 015 | ap | Frequency Response _300 < F < 3400 Hz [-o1 | 0 o1 | aB Gain Linearity F = 1020 Hz, Vix oF Vax +3to-40dBm | ~0.05 00s | a8 = 40 to- 50 dBm | ~ 0.1 0.1 dB Transhybrid Loss Vax =0 48m 300 < F < 3400 Hz 40 dB Total Harmonic Distorsion F < 1020 Hz. 0 dBm [-s0; | | oe | | No _| Psophometric Noise on TX, or on the Line [-75 | |_| a8mp | Power Supply Rejection Ratio 300 < F < 3400 Hz Ve = 34 4B Voo, Vss|_~ 20 B RELAY DRIVER Symbot| Parameter Typ. | Max. | Unit. | Ising | Sink Current [| beakage Curent TT t00 gk [TT ateakiown tage tes 200m |e tv DIGITAL INTERFACE L_[owckFreqency zp | SUPPLY CURRENT Symbol] Parameter Min. | Typ. “Unit. ICC’ | Positive Supply Standby mA Power up mA 1c | Negative Supply Current Standby mA Power up mA Battery Supply Current ‘Standby 07 Power up | 5 G57 S&S:THOMsoN 1718 “Y/ icnomscrnomes 383

TIMING DIAGRAM (controller to SLIC to controller) cs qT - se mo r WRITING READING | BUG } “LATCH IF B?-1 MBBTDB7711-12 -LOADING OUTPUT REGISTER, aE TTA SGS-THOMSON 0 384