 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
L3092 Datasheet(PDF) 7 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
L3092 Datasheet(HTML) 7 Page - STMicroelectronics |
|
|
7 / 32 page  c) Ringing (RING) d) Boost Battery (BB),(see Appendix B). The fifth status, Power down (PD), is set by the output pin PDO of the L3092 that disconnect the Bias Resistor, RH, of L3000N from ground. The main difference between Stand-by and Power down is that in SBY the power consump- tion on the voltage battery VB– (– 48V) is reduced but the L3000N DC Feeding and monitoring cir- cuits are still active, in PD the power consumption on VB- is reduced to zero, and the L3000N is completely switched off. SLIC OPERATING MODES Through the L3092 Digital Interface it is possible to select six different SLIC OPERATING MODES : 1) Conversation or Active Mode (CVS) 2) Stand - By Mode (SBY) 3) Power - Down Mode (PD) 4) Automatic Stand - By Mode (ASBY) 5) Test Mode (TS) 6) Ringing Mode (RNG) 1) CONVERSATION (CVS) OR ACTIVE MODE This operating mode is set by the control proces- sor when the Off hook condition has been recog- nized, As far as the DC Characteristic is concerned two different feeding conditions are present : a) Current limiting region : the DC impedance of the SLIC is very high (> 20K Ω) and therefore the system works like a current generator. By the L3092 Digital Interface it is possible to selects the value of the limiting current.: 60mA, 40mA or 25mA. b) A standard resistive feeding mode : the charac- teristic is equal to a battery voltage (VB-) minus 5V, in series with a resistor, whose value is set by external components (see external component list of L3092). Switching between the two regions is automatic without discontinuity, and depends on the loop re- sistance. The SLIC AC characteristics are guar- anteed in both regions. Fig. 1 shows the DC characteristic in conversa- tion mode. Fig. 2 shows the line current versus loop resis- tance for two different battery values and RFS = 200 Ω. The allowed maximum loop resistance depends on the values of the battery voltage (VB), on the RFS and on the value of the longitudinal current (IGDK). With a battery voltage of 48V, RFS = 200 Ω and IGDK = 0mA, the maximum loop resistance is over 3000 Ω and with IGDK = 20mA is about 2000 Ω (see Application Note on maximum loop resistance for L3000N/L3092 SLIC KIT). In conversation mode the AC impedance at the line terminals is synthetized by the external com- ponents ZAC and RP, according to the following formula : ZML = ZAC 25 + 2 ⋅ RP Depending the characteristic of the ZAC network, ZML can be either a pure resistance or a complex impedance. This allows for ST SLIC to meet dif- ferent standards as far as the return loss is con- cerned. The capacitor CCOMP guarantees stabil- ity to the system. The two to four wire conversion is achieved by means of a circuit that can be represented as a Wheatstone bridge, the branches of which being: 1) The line impedance (Zline). 2) The SLIC impedance at line terminals (ZML). 3) The balancing network ZA connected between RX input and ZB pin of L3092. 4) The network ZB between ZB pin and ground that shall copy the line impedance. It is important to underline that ZA and ZB are not equal to ZML and to Zline. They both must be multiplied by a factor in the range of 10 to 25, al- lowing use of smaller capacitors. In case the L3000N/L3092 kit is used with a second generation programmable 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 L3000N/L3092 SLIC kit in fact allows to keep the echo signal always within the COMBO Hybrid Balance Filter dynamic range. In conversation mode, the L3000N dissipates about 250mW for its own operation. The dissipa- tion related to the current supplied to the line shall be added, in order to get the total dissipation. Table 1. Pin 12 of L3092 Pin 12 of L3000N (C2) +3 0 –3 Pin 13 of L3092 +3 Stand-by Conversation Not Used (C1) 0 Not Used B.B Not Used Pin 11 of L3000N –3 Not Used Ringing Not Used L3000N - L3092 7/32 |
Similar Part No. - L3092 |
|
Similar Description - L3092 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
