ky SGS-THOMSON MICROELECTRONICS TDB7711 TDB7722 SUBSCRIBER LINE INTERFACE CIRCUIT KIT PROGRAMMABLE DC FEEDING RESIS- TANCE AND LIMITING CURRENT (seven values) a LONGITUDINAL BALANCE PERFORMANCE : UP TO 63 dB FOUR OPERATING MODES (power-down, stand-by, conversation, ringing control) POWER SAVING FEATURE SIGNALLING FUNCTION (off-hook/ground key) HYBRID FUNCTION EXTERNAL RINGING ALLOWING BALANCED AND UNBALANCED RINGING WITH ZERO CROSSING INJECTION AND RING TRIP DE- TECTION = AUTOMATIC RINGING STOP WHEN OFF- HOOK IS DETECTED a LOW POWER CURRENT CONSUMPTION IN STAND-BY MODE (90 mW) a LOW NUMBER OF EXTERNAL COMPO- NENTS. THESE COMPONENTS REQUIRE ONLY STANDARD TOLERANCE : 1 % RESIS- TORS AND 10-20 % CAPACITORS POSSIBILITY TO WORK WITH HIGH COM- MON MODE CURRENTS a TELETAXE a ANALOG INPUT/OUTPUT GENERAL PURPOSE BIT a INTEGRATED THERMAL PROTECTION PIN CONNECTION Multiwatt 15 DIP28 PLCC28 ORDER CODES : TDB7722 (Multiwatt 15) TDB7711 (DIP28) TDB7711 (PLCC28) | LS Rrvy (J1 2ef] cK o1vo (2 a7] cs | aG cpa |] 3 26{] 0GND 2 RR - LP cr c2 [Ja 25f] RIN a) vDD oresye a ca (fs 2ape teve vIN it [16 2ap) 1Rv2 a) @GND voo {7 22[4 tT { YBIM ecvoc []8 210 cro [ NOE | GND Roc LJ] 20) REF 1. oS lip uss []18 9.) vain _- 5 va cac L411 18[ aio [a It ace [J12 22.7] vour [| c2 za [is 7e{) 2ac L a ot 2 RING t (14 15,7) AGND MOBTOB771113 NBeTD87722-B2 TDB7711 TDB7722 June 1989 1/18 367TDB7711-TDB7722 DESCRIPTION The ST SLIC KIT (TDB7722/7711) is a set of solid state devices designed to integrate the main func- tions needed to interface a telephone line. it consists of 2 integrated devices : the TDB7722 line interface circuit and the TDB7711 control unit. This kit performs main of the BORSHT functions : . Battery feed _ Overvoltage protection with double trisil device and 2 protection resistors . Ringing control - Signalling . Hybrid ABSOLUTE MAXIMUM RATINGS The ST SLIC KIT has been designed to achieve per- formant transmission characteristics like excellent longitudina! balance and very low consumption. In addition, this kit controls an external ringing relay with zero crossing injection. This kit is fabricated using a 80 V Bipolar, junction isolated technology, with accurate thin film resistors for the TDB7722 and a 10 V Bipolar I2L technology for TDB7711. This kit is suitable for all applications, C.O or PBX, where balanced or unbalanced ringing are re- quested. Symbol Parameter Value Unit Vb Negative Battery Voltage 72 v Vad Positive Supply Voltage +55 Vv Vss Negative Supply Voltage - $5 Vv Vagnd-Vbgna} Maximum Voltage Between Analog GND and Battery GND +2 Vv Tj Maximum Junction Temperature + 150 Cc Tstg Storage Temperature ~ 55' to 150' 'C THERMAL DATA TDB7722 HIGH VOLTAGE Rihijc Max. Resistance Junction to Case 3 C/iW Rihja Max. Resistance Junction to Ambient 40 CW TDB7711 LOW VOLTAGE Rthja Max. Resistance Junction to Ambient 80 CIV | OPERATING RANGE Symbol Characteristics Nin. Typ. Max. Unit. Toper Operating Temperature Range 0 70 c Vo- Negative Battery Voltage -72 20 Vv Vad Positive Supply Voltage +45 +55 v Vss Negative Supply Voltage -55 -45 v Imax Total Line Current 120 mA 2/18 i =z SGS-THOMSON T7 jwcroectnomes 368TDB7711-TDB7722 PIN DESCRIPTION TB7722 N' | NAME DESCRIPTION _| 1 RING B Line Termination Output with Current Capability up to 120 mA (Ip is the current sunk into this pin). 2 Cc, Digital signal input (3 voltage levels) that defines device status with pin 3. Longitudinal current is also provided. 3 Co Digital signal input (3 voltage levels) that defines device status with pin 2. Thermal warning current is also provided by TDB7722 through this pin. 4 It High precision scaled transversal line current signal. It is a current generator referred to AGND. I+ = la + lp - 200 5 VB Negative Battery Supply Voltage. 6 TIP A Line Termination Output with Current Capability up to 120 mA (la is the current sourced from this pin). 7 BGND Battery Ground Relative to Vg_ Supply Voltage. It is also the reference ground for TIP and RING signals. 8 NC Not connected, this pin is connected to internal circuitry and should not be used as a tiepoint for external circuitry. 9 VeIM This voltage output provides Veer/40 Voltage to TDB7711 Vrer : Filtered Battery Voltage - (!Vgar!-2.1 V) 10 Aanp Analog ground, all input signals and Vop supply voltage must be referred to this pin. 11 VIN 2 Wire Unbalanced Voltage Input 12 Voo Positive Power Supply + 5 V 13 CF An external capacitor connected between this pin and BGND filters battery noise. 14 RR Ring relay driver : output used to drive a5 V or 12 V external ring relay. 15 RG Ring Relay Ground 3/18 kyr SGS-THOMSON MICROELECTROMICS 369TDB7711-TDB7722 PIN DESCRIPTION TB7711 N' NAME DESCRIPTION 1 Rw Read/Write Command of the Serial Digital SLIC Control 2 DIO Data Input/output for SLIC Serial Control 3 GPB General Purpose Bit. TTL/CMOS Output Available for any Specific Application. 4 C2 State control signal output (3 voltage levels) used also as thermal warning current input from TDB7722. 5 C1 State controll signal output (3 voltage levels) used also as scaled tranversal line current input from TDB7722. C1 and C2 combination defines operating mode of the high voltage part. 6 Ir Scaled down Transversal Line Current Input Ir = la + lp. 200 7 Vop Positive Supply Voltage, + 5 V. 8 AC/DC AC-DC Feedback Input. 9 RDC DC Feeding System. 10 Ves Negative Supply Voltage, 5V. 11 CAC AC Feedback Input. 12 RPC AC Line Impedance Adjustment. 13 ZB Tx amplifier negative input performing the two to four wire conversion. 14 Tx Transmit Amplifier Output. 15 AGND Analog Ground. Vpp and Vgss supply voltages are referenced to this pin. 16 ZAC AC Line Impedance Synthesis. 17 VOUT Two wire unbalanced output carrying out following signals : - DC voltage to perform the proper DC characteristic - Voice signal - Teletax 18 Al/O Programmable analog input/output pin, used to feed the SLIC with a low voltage battery offering power saving capability. Also used to detect line short circuits. 19 Veim Vrer/40 Voltage Input from TDB 7722. 20 REF Bias Setting Pin 21 Crt Ringing filter Capacitor used also to filter longitudinal current and to shape teletax signal. 22 TTX Teletax Signal Analog Input. 23 IR/2 . on . rn Differential line current inputs in ringing network. 24 IR/1 25 RING Ringing Signal Input for Synchronisation. 26 DGND Digital Ground 27 cs Chip Select Input 28 CLK Clock 128 kHz 4/18 i SGS-THOMSON Jf MicrosscTaomes 370TDB87722 BLOCK DIAGRAM TDB7711-TDB7722 CF @8GND VB YDD AGNO O ny 7] "2 13 g SUPPLY uBINQ4 14 FILTER RELAY 15 Cl ORIVER 3 C2 CONTROL THERMAL 2 C1 O- INTERFACE PROTECTION } t, Jj, 11 INPUT OUTPUT { VIN O- 1 STAGE STAGE CURRENT [-2 4 IT SENSOR NEBTDOE7722-B1 RR RG TIP RING TDB7711 BLOCK DIAGRAM Zac VOUT VDD VSS REF O CRT RING IR/1_ IR/2 RING TRIP. DETECTION H.U. INTERFACE LINE FEEDING CHARACTERISTICS SLIC IMPEOANCE SYNTHESIS 2 WIRES/4 WIRES poo ; -oaP SUP TTIL/CMOS INTERFACE LOGIC INTERFACE A R/Y CS DI/O DGND AI/0 MEBTDB?7 11-81 ka SGS-TH MSON Jf pare ait 5/18 371TDB7711-TDB7722 FUNCTIONAL DIAGRAM Figure 1 : Simplified Block Diagram. BRIOGING NETUORK 7 woe WU CIRCUIT 7722, DRIVER 51.2BUIN ILTeILte IA TT TIP ZLIME US2-UREF - 28UEM RING ILT-ILL-IB ax aa TosvFaDn + TOF IDE zB ILL/1@8 1 CARO CONTROLLED MeeTORI7II- 82 Figure 2 : Functional Diagram - DC Path. AC PATH TK = -VU WASTE Ta-IL Teil | ZU INE Tbe SLT- ILL pan QUICK OFF -HOOK | be rect ium SLOW OFF -HOOK yarTewy APPARENT DETECTION HU CIRCUIT TOB7722 >t BATTERY vou TacE qLIn Tun COR@ECTION LU CIRCUIT TOB7711 MNBBTOE7711-83 6/18 i SGS-THOMSON T7 sacnonscrnomes 372Figure 3 : Functional Diagram - AC Path. TDB7711-TDB7722 LU CIRCUIT TOB7711 US1-2QUIN nel TIP r a | TeeILTe Iu Tre uv 7c DUT VIN @LINE me, To-ILT-ILt Ny _ rm Vv NB] RING oF RING TIX YS2-UREF - 28VIN FILTE iT IT _ ILT/188 2At ac/0c et-=-) RPC wee cae ' 1 > ROC Loe 5 HU CIRCUIT TOB7722 2.79 e TAC cAc cc -4 ze Roc 1 ' 1 1 ie caw! Be? 2a zB * MGBTDAZ711- 04 Figure 4 : Functional Diagram - Ringing and Miscellaneous Functions. -vB BEND _ Lu CIRCUIT TOB7711 2.40 IR/1 H RING TRIP R Ti TR/2 FELT DETECTION RING cr UREF TTX CF 8.6U SHAPING TIX LONGIT. _ RELAY RR N CURRENT FILTERING CRT DRIVER RG C1, C2 INTERFACE we fove| = | Ac+DC <D- ci. C2 INTERFACE REF UaT _ > REF REF LT | HU CIRCUIT TOB?722 LOGIC INTERFACE 6PB cS RvW DI7O CLK OGND N@etDa7711-a5 {57 SGS:THOMSON 78 MIGROELECTROMICS 373TDB7711-TDB7722 FUNCTIONAL DESCRIPTION TDB7722 - HIGH VOLTAGE CIRCUIT The TDB7722 line interface provides a battery feed- ing and drives a ring relay. The TDB7722 contains a state decoder which is under control of the low voltage TDB7711. This decoder selects : - one of the following operational modes : power down, stand-by, conversation, ring relay control, power saving - direct or reverse battery operation. The circuit makes the sum and difference of the two wire currents (la, Ib) to provide the transverse and longitudinal components to the LV SLIC (Scaled down : 1/100). The scaled down transverse current flows by lt pin. The scaled down longitudinal current flows by C1 pin. In addition, TDB7722 provides thermal warning cur- rent to the low voltage chip via pin Ca. The TDB7722 amplifies both the AC and DC signals entering pin 11 (VIN). Separate grounds are provided : - analog ground as a reference for analog signals - battery ground as a reference for the output stages TDB7711 - LOW VOLTAGE CIRCUIT 1) The TDB7711 low voltage contro! unit controls TDB7722 line interface module, giving the proper informations to set line feed characteristics (drop voltage mode, feed resistance mode, current limita- tion) for several working modes : - apparent battery - real battery - special DC characteristic 2) The transmission characteristics of the SLIC are the following : - a 2/4 wires conversion - longitudinal current rejection - based on 1DB7722 informations and external components configuration, the TDB7711 handles the impedance synthesis and hybrid balance 3) Signalling features are : - teletax (shaping and filtering) (described in application note AN298) - ring trip detection (described in application note AN298) - pulse dialing - ground key detection 4) Other features - analog input/output pin (described in application note AN298) - general purpose bit (described in application note AN298) - interface with the card controller through a 4 wire serial bus - thermal warning WORKING STATES OF THE KIT In order to carry out the various operation modes, the ST SLIC kit has several different working states. Each mode, externally selected by microcontroller, is defined by the voltage respectively applied by pins 5 and 4 of T1DB7711 to the pins 2 and 3 of TDB7722. Three different voltage levels (1.4 ; 0; + 1,4) are available at each connection, defining all possible states as listed in table 1. C1 Pin 5 of TDB7711 Pin 2 of TDB7722 +14 0 -~14 Pin 4 +14 Power Down |Reverse Battery Not Allowed TDB7711 C2 Ping 0 Power Down | Normal Battery Ringing in of 1DB7722 -14 Power Down Standby Not Allowed Appropriate combinations of two pins define the four possible status of the kit, that are : a) Stand-by (SBY) b) Conversation (CVS) c) Ringing (RING) d) Power down (PD) 8/18 i SGS-THOMSON The main difference between stand-by and power down is that in SBY the power consumption on the voltage battery Ve ( 48 V) is reduced but the SLIC can feed the line, recognize the on-hook, off-hook status and ground key status. MICROELECTRONICS 374In power down, the power consumption is closed to Zero, tip and ring terminals are in high impedance and all line detection circuits are disabled. The SBY status should be used when the telephone is in on-hook and PD status only in emergency con- dition when it is mandatory to cut any possible power dissipation with no running operation. OPERATION MODES STAND-BY (SBY) MODE. In this mode, most of the functions of both low voltage and high voltage cir- TDB7711-TDB7722 cuit are not active in order to reduce the power con- sumption. The only working functions are following : * Line feeding - line voltage |Vbat| 10 V - current supplied to the line limited to 60 mA - output resistance = protection resistance (Rp) a I) ine =66mA SLOPE IS 2xRp Va MN8ETOB7711-15 B- |-18U U * On/off hook detection The current of the 2 wires are sensed and the scaled down transverse current is provided to low voltage SLIC for signalling detection. In this mode, the polarity of the battery should be di- rect (TIP wire more positive than RING one). When the SLIC is set in SBY mode, the power dissi- pation of TDB771 1/TDB7722 kit is 90 mW. CONVERSION (CVS) MODE. This operation mode is set when the off-hook condition has been recog- nized. 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 ( > 20 Kohms) and therefore the system works like a current generator. The limiting current is defined by programmation via the logic interface and selected among the seven following values : 12 mA, 20 mA, 30 mA, 32 mA, 42 mA, 50 mA, 62 mA b) A standard resistive feeding mode The characteristic is : Veat minus a voltage equal to Reed X lline with Rieed defined by external resistor RDC (RDC = 2 (Rieed Rp)) c) A nearly constant voltage mode The voltage value is |Vaat| 13 V. This 13 V drop voltage allows the output amplifiers to keep a good linearity. For |VBat| > 48 + 13 = 61 V, this mode does not exist. The three different feeding conditions are applicable or not in the three different following feeding modes. These three feeding modes are controlled by the two digital eight bits word written in the low voltage circuit. yz S&S-THOMSON 9/18 MICROELECTRONICS 375TDB7711-TDB7722 1) Apparent Battery. Tiimit N88TDB7711-86 V g-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. Veer Ya-2.4U NEETOBZ77A11-87 Ye-13u | This solution is same as apparent battery except for the standard resistive mode where the voltage value is: |Viine| = |VREF| Rfeed x lline with |Vrer| = |Ve-| 2,1 V 3) Special Characteristic. Therefore the line voltage depends on the current battery voltage Vp. if Jimit Rp N88TDB7711-88 > U 10/18 iy 376 SGS-THOMSON MICROELECTRONICSIn this mode, there is no standard resistive feeding region. This mode is specially suitable for PBX ap- plications. The three feeding modes above can operate either in normal polarity or in reverse polarity. RINGING MODE (RING). When ringing, the SLIC must be in normal battery mode. An external circuit applies ringing signal through the ringing network and the ring relay. This circuit consists of a balanced or unbalanced sinus generator (70 to 100 VRMS) in serie with the battery ( 48 V). When the ringing control is selected (by software), ring relay is energized at the zero crossing point of 2 cases : TDB7711-TDB7722 the ringing generator. The ring relay is disenergi- zed either when ring trip is detected or by softwa- re, using one bit of the second byte written in the SLIC (see page 13: data input). There is a sophisticated ring trip detection circuitry insensitive to parasitic noise on the line. The ring trip principle is as follows : - the line current is sensed by a resistive network, not sensitive to longitudinal current. - a fraction of the line current is sent in a capacitor during one period of the ringing signal. - V is measured at the beginning and at the end of the period. 1) No Voltage Difference and Therefore No DC Component Exists in Line Current. i MNEETOB7711-89 2) Voltage Difference and Therefore a DC Component Exists in Line Current. 4 V4 or _ _ Av >t N@BTOB7711-18 Ky7 Sizonsemones 11/18 377TDB7711-TDB7722 POWER DOWN MODE (PD). In case of overtem- perature or on logic control (see page 13: data out- put) the high voltage SLIC TDB7722 can be set in power down mode. In this case, the power con- DIGITAL CONTROL INTERFACE The programmable functions of the SLIC are set by the contents of two 8-bits registers in the TDB7711 (low voltage) chip. Connection between TDB7711 and the card con- troller is realized through a 4-wire serial bus. The four pins have following functions : CLK : Shift Clock (128 kHz max) CS: Chip select (active low) Di/O : Bidirectional pin : data-in (2 bytes), data-out _ (12 bit word) R/W : Read (if "o"} or write (if "1") Data input sumption is very low, the line drivers amplifiers (TIP and RING) are set in high impedance state and can- not deliver any current. The datas are shifted into the low voltage TDB7711 on the rising edge of each CLK pulse, if CS = 0 and RW = 1. The datas are shifted out from TDB7711 on the ris- ing edge of each CLK pulse, if CS = 0 and RW =0. The first bit BO can even be read without any CLK pulse, as soon as CS = 0 and R/W = 0. This bit is read again, as BO, upon the first CLK ris- ing edge of a read operation. When GS = 1, the DI/O pin is in high impedance, allowing several SLICS to share the same data link. Two bytes can be written into the SLIC to program its registers. BO = 0 = First Byte Selected Note 2 B1 = Standby 0 = Power up 1 = Standby B2 = Normal/Special Characteristic 0 = Normal 1 = Special B3 = Real/Apparent Battery 0 = Apparent 1 = Real B4 = Current Limitation 1 0=O0mA Note 1 1=30 mA B5 = Current Limitation 2 O0=0mA Note 1 1=20 mA B 6 = Current Limitation 3 0=0mA Note 1 1=212mA B 7 = Validation 0 = This word is not stored into the SLIC __ 1 =This word is stored into the SLIC on rising edge of CS Notes; 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 first bit shifted into or shifted out from the DI/O pin. 3. The SLIC is set in POWER DOWN mode if B1 = 1 and B4 = BS = B6 = 0. 12/18 iki SGS-THOMSON MICROELECTROIIES 378TDB7711-TDB7722 BO = 1 = Second Byte Selected Note 1 B1 = Generai 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 = Direct/Reverse Battery 0 = Direct Battery 1 = Reverse Battery B5 = Ringing 0 = Ringing Off 1 = Ringing On B6 = 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 bit is always the first bit shifted into or shifted out from the DI/O 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 Ai/O pin 1 = lline voltage! < voltage set on AI/O pin B2 = Ground Key (GK) 0 = No Ground Key 1 = Ground Key B3 = 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 first bit shifted into or shifted out from the DI/O pin. Reset: The logic circuitry is automatically reset at power on, or by hardware, when applying the Voo voltage on the TTX pin. (7 SGS-THOMSON 1318 SF microzecrromes 379FE-LieAOLBBN TDB7711-TDB7722 APPLICATION DIAGRAM YETIONLNGS Gud Fees E200: E sueee ssn aan -an uaLTi4 xLd {| A ONIN Lasaa aeise T avid | O/T. A/B._, add oaeH ou lt Li ana so = y79 = xLl} P-OONG + nzt+ o Hoos ay NIN anon ML QNTa dact ONT z2ay + gO Sey At ee W tay a2 rusia] 2280l dney tTtT28cl dil _ UaEx A dll Ta 383 gy OD ae | to 1 aun za 29 acn ag Han wan Ida eu ve GNOY -Bn anag z/ul ONTY kad 43a sel] gu ; wat gan ssn ~~ gnaw . Ig Lyle T r 4a suger gw Py azzme a*s1| {538 tal] | jee T pT uNacz 4UaT 3} QNTa8 SNTaD 4OLGaSN39 ON9e ONISNIY -an evowurnowu MICROELECTRONICS ky SGS-THOMSON 14/18 380TDB7711-TDB7722 EXTERNAL COMPONENTS LIST TDB7722 (high voltage) Component Ref Value Function oe 470 ak 400 V (20 %) Protection Resistor Battery Voltage Rejection TBD7711 (low voltage) Component Ref Value Function REF 15.8 Kohms (1 %) Bias Resistor RDG 680 ohms Feeding Bridge Resistor CAC 47 wp F/10 V (20 %) AC Path Decoupling ZAC 27 Kohms (ZO = 600 ohms) Scaled AC impedance RPC 3 Kohms (Rp = 30 ohms) PTC Resistor Compensation ZA 60 Kohms (ZO = 600 ohms) SLIC impedance Balance Network ZB 60 Kohms (ZO = 600 ohms} Line Impedance Balance Network CBW 270 pF/10 V (10 %) Bandwith Capacitor C'BW 120 pF/10 V (10 %) Bandwith Capacitor Compensation CRT 220 nF/10 V (20 %) Ring Trip Capacitor ae ne OO hee 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 : Tamb =25 C, Ve = 30 to -72 V, Vop =+5V1t5%, Vss Transverse Line Current (I_7) = 30 mA LINE FEEDING CHARACTERISTICS =-5V15% Symbol Parameter Min. Typ. Max. | Unit. him Loop Current at Constant Current Range 12 62 mA Feed Accuracy -0 +10 % Rteed | Feed Resistance Range 300 1000 Q Accuracy -5 +5 % Vapp Apparent Battery Voltage --504/ -48 | - 45.6 Vv (7 SGS-THOMSON 15/18 T/ imenomscrromcs 381TDB7711-TDB7722 ELECTRICAL OPERATING CHARACTERISTICS (continued) SIGNALLING Symbol Parameter Min. Typ. Max. Unit. | (off) | Off Hook Detection Threshold Power up or Power Down 5 8 mA Iu (on) | On Hook Detection Threshold Power up or Power Down 4 7 mA ly (hys) | Off/On Hook Hysteresis 1 mA Dialing Distortion 3 ms Off Hook Reponse Time Transverse Line Current 70 ms !L7 =20 mA Power Down lax (on) | Ground Key Detection Threshold 3.5 7 mA Ground Key Detection Reponse Longitudinal Line Current 250 ms Time ILL =20 mA In (ton) | Ring Trip Detection Threshold 5 10 mA Fa Ringing Frequency 16 70 Hz Ring Trip Delay Lt =15 mA 4/FR s Vit Teletax Sending (with TT Filter) Line Level 22 25 Vims F < 18 kHz . Grtx R_ = 200 Q Gain 7 8 9 2 WIRE PORT TRANSMISSION Symbol Parameter Min. Typ. Max. Unit. Overload Level 100 < F < 4000 Hz 6 dBm Return Loss 300 < F < 3400 Hz 20 dB Longitudinal Impedance On or Off Hook Q per . r10 r+10 : Rp, = Protection Resistance wire Longitudinal Balance Off-Hook 200<F<1000Hz 58 63 dB Conversation Mode Off-Hook F=3000Hz 53 58 On-Hook 200<F<3400 50 53 Longitudinal Signal Generation 100 < F < 3400 Hz 52 60 dB Longitudinal Handling Capability 35 mArms 16/18 382 Ay7 BiSonicmanesTDB7711-TDB7722 ELECTRICAL OPERATING CHARACTERISTICS (continued) 4 WIRE PORT TRANSMISSION Symbol Parameter Min. Typ. Max. Unit. Overload Level On RX 3 dBm On TX 3 dBm TX Output Offset Voltage 100 mV Z1x TX Output impedance 10 Q Grx RX to Line Gain F = 1020 Hz, Vax = 0 dBm -0.15 0 0.15 dB Gtx Line to TX Gain Vrx =0 dBm -0.15 0 0.15 dB Frequency Response 300 < F < 3400 Hz -0.1 0 01 dB Gain Linearity F = 1020 Hz, Vrx or Vax + 3 to- 40 dBm ~ 0.05 0.05 dB 40 to- 50 dBm j ~ 0.1 0.1 dB 50 to- 55 dBm | - 0.2 0.2 dB Transhybrid Loss Vax =0 dBm 300 < F < 3400 Hz 30 40 dB THD Total Harmonic Distorsion F < 1020 Hz. 0 dBm 50 dB Np Psophometric Noise on TX, or on the Line -75 dBmp PSRR_ | Power Supply Rejection Ratio 300 < F < 3400 Hz Vg - 34 dB Vop, Vss|_ 20 dB RELAY DRIVER Symbol Parameter Min. Typ. Max. Unit. Isink Sink Current 100 mA Leakage Current 100 WA Voltage Drop Switch On 1 Vv Breakdown Voltage Ico = 200 pA 75 Vv DIGITAL INTERFACE Symbol Parameter Min. Typ. Max. Unit. Clock Frequency 128 150 KHz SUPPLY CURRENT Symbol Parameter Min. Typ. Max. Unit. Icc* Positive Supply Standby 8 mA Power up 22 mA icc Negative Supply Current Standby 6 mA Power up 24 mA leat Battery Supply Current Standby 0.7 mA Power up 5 mA {7 SGS-THOMSON 17/18 T/ jucrorscrRomes 383TDB7711-TDB7/722 TIMING DIAGRAM (controller to SLIC to controller) oS | | wu -- aa r i Xus us KX cra X ck X TY Kyer rin p170 EXE KEK. Xersns Kove X cox X TY Kusr rine URITING READING laren IF B7-1 MOBTDB7711-12 -LOADING OUTPUT REGISTER 18/18 kz SGS-THOMSON Y7 MickosuzeTnomes 384