L3234 STMicroelectronics, L3234 Datasheet
L3234
Available stocks
Related parts for L3234
L3234 Summary of contents
Page 1
... Battery Feed (Balanced Mode) - Ringing Injection - Signalling Detection - Hybrid Function The Kit comprises 2 devices, the L3234 ringing Janauary 1995 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. AND KEY SYSTEM APPLICATIONS ORDERING NUMBER: L3234 ...
Page 2
... L3234 - L3235 Figure 1: Typical Application Circuit with Second Generation COMBO for Complete Subscriber Circuit (Protection-SLIC-COMBO) 2/26 ...
Page 3
... Figure 2: Typical Application Circuit with First Generation COMBO for Complete Subscriber Circuit (Protection-SLIC-COMBO) L3234 - L3235 3/26 ...
Page 4
... The AC ringing signal amplitude 60Vrms, and for that purpose a positive supply voltage of +100V shall be available on the subscriber card. The L3234 receives a low amplitude ringing sig- nal (950mVrms) and provide the voltage/current amplification (60Vrms/70mA) when the enable in- put is active (CS > 2V). In disable mode (CS < ...
Page 5
... High Power Supply Voltage V Low Power Supply Voltage CC V Low Voltage Ringing Signal A Operating Temperature for L3234 Max. Junction Operating Temperature (due to thermal protection) jop Note: Operating ranges define those limits between which the functionality of the device is guaranteed. THERMAL DATA ...
Page 6
... The Fig. 3 show the simplified circuit configuration Figure 3: L3234/L3235Circuit Configuration A TIP LINE TERMINALS RING LINE FEEDER L3235 EXTERNAL COMPONENTS LIST In the following table are shown the recommended external components values for L3234. Ref. Value R01, R02 82 C01, C02 160V CA 4 10V ...
Page 7
... Figure 4: Dynamic Features of L3234 DATA TRANSMISSION INTERFERENCE TEST The L3234 meet the requirements of the technical specification ST/PAA/TPA/STP/1063 from the CNET. The test circuit used is indicated below. Figure 5: Test Circuit Data Transmission Interference Test L3234 - L3235 The measured error rate for data transmission is ...
Page 8
... All pa- rameters listed here are met in the range +70 C. For applications requiring operations in the standard temperature range ( use L3234. If operations are required in the ex- tended temperature range (- C), use the L3234T. ...
Page 9
... TEST CIRCUITS (continued) Figure 7. VCC V100 L3234 4 GND D94TL133 Figure 8. Figure 9. 10 F/160V VOUT2 F/160V VOUT1 -VBAT LINE FEEDER L3234 - L3235 V ZLINE=600 VE 1KHz 9/26 ...
Page 10
... L3234 - L3235 TEST CIRCUITS (continued) Figure 10. Figure 11. Figure 12. 10/26 ...
Page 11
... The chip is protected by thermal protection 150 C. The SLIC is able to give a power up command for Combo in off hook condition and an enable logic for solid state ringing injector L3234. The L3235 package is 28 pin plastic PLCC. The L3235 has been designed to operate togheter ...
Page 12
... Stand by Logic Input (SBY = 1 Set Line Current Limitation at 3mA). Power u.p Logic Output for the Codec Filter. ( means Codec Filter Activated) Ring Injector Enable for L3234 Output. ( means L3234 Ringing Injection Enable). Hook Status Logic Output ( means off hook). ...
Page 13
... CS en- able input of the solid state ringing injector L3234. In this way the L3234 will be enabled when ring- ing mode is programmed and will be automat- ically disabled when the ring trip condition will be detected reducing the ringing signal disconnec- tion time after ring trip ...
Page 14
... Ringing Mode (SBY = 0 and RNG = 1) When ringing mode is selected ”CS” pin is set order to activate the L3234 ringing injector. See L3234 for detailed description. Ring trip is detected by means of the same inter- nal circuitry used for off-hook detection. ...
Page 15
... V is the AC transversal voltage at line terminations the line open circuit AC voltage the line impedance l L3234 - L3235 R are the protection resistors the line impedance balancing network the SLIC impedance balancing network A Z program the AC line termination impedance ...
Page 16
... L3234 - L3235 Figure 15: Simplified AC Circuits Two wire impedance To calculate the impedance presented to the two wire line by the SLIC including the protection re- sistors R and defined as Z let Il/50’ = Il/50 (in first approximation / make Z = 600 ...
Page 17
... AC Feedback compensation f1 = 300KHz Slic Impedance Balancing Net. Line impedance Balancing Net. C Transybrid loss Compensation C DC Decoupling Tx Output Line Rectifier External Transistor 5V supply filter V supply filter BAT and R , with R > L3234 - L3235 Formula = 0.69 C 39K ( 0.69 C 39K GF 564 R = LIM I 3mA LIM ...
Page 18
... L3234 - L3235 Figure 16: Typical Appication Circuit Including L3234 and Protection 18/26 ...
Page 19
... All pa- rameters listed here are met in the range +70 C. For applications requiring operations in the standard temperature range ( use L3234. If operations are required in the ex- tended temperature range (- C), use the L3234T. ...
Page 20
... L3234 - L3235 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter DIGITAL STATIC INTERFACE V Input Voltage at Logical ”0” Input Voltage at Logical ”1” Input Current at Logical ”0” Input Current at Logical ”1” Output Voltage at Logical ”0” Output Voltage at Logical ”1” ...
Page 21
... Figure A1: 2W Return Loss log L Figure A2: Trans-hybrid Loss 20log Figure A3: Sending Gain 100 F In particular: A-B: Line terminals C: Tx sending output on 4W side D: Rx receiving input on 4W Side 100 F 100 log | 100 F 100 F 100 F L3234 - L3235 21/26 ...
Page 22
... L3234 - L3235 TEST CIRCUITS (continued) Figure A4: Receiving Gain Figure A5: SVRR Relative to Battery Voltage VB Figure A6: Longitudinalto Transversal Conversion 22/26 100 F 100 F 100 F 100 F ...
Page 23
... Figure A7: Transversal to LongitudinalConversion APPENDIX B LAYOUT SUGGESTIONS Standard layout rules should be followed in order to get the best system performances: L3234 - L3235 1) Use always 100nF filtering capacitor close to the supply pins of each IC. 2) The L3235 bias resistor (RR) should be connected close to the corresponding pins of L3235 (REF and AGND) ...
Page 24
... L3234 - L3235 HEPTAWATT (Surface Mount) PACKAGE MECHANICAL DATA DIM. MIN 2.4 D1 1.2 E 0. 2.41 G1 4.91 G2 7.49 H2 9.2 H3 10.05 L 4.6 L1 3.9 L2 6.55 L3 5.9 L5 2 0.17 V2 Dia 3.65 24/26 mm TYP. MAX. MIN. 4.8 1.37 2.8 0.094 1.35 0.047 0.55 0.014 0.8 0.024 0.9 2.54 2.67 0.095 5.08 5.21 0.193 7.62 7.8 0.295 10.4 0.362 10.4 0.396 5.05 0.181 4.1 4.3 0.153 6.75 6.95 0.253 6.1 6.3 0.232 2.8 3 0.102 15.8 0.594 6.6 0.236 ...
Page 25
... PLCC28 PACKAGE MECHANICAL DATA DIM. MIN. A 12.32 B 11.43 D 4.2 D1 2.29 D2 0. TYP. MAX. MIN. 12.57 0.485 11.58 0.450 4.57 0.165 3.04 0.090 0.020 10.92 0.390 1.27 7.62 0.46 0.71 0.101 1.24 1.143 L3234 - L3235 inch TYP. MAX. 0.495 0.456 0.180 0.120 0.430 0.050 0.300 0.018 0.028 0.004 0.049 0.045 25/26 ...
Page 26
... L3234 - L3235 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. Specifications men- tioned in this publication are subject to change without notice ...