Zakładka z wyszukiwarką danych komponentów |
|
MC145474 Arkusz danych(PDF) 5 Page - Pulse A Technitrol Company |
|
MC145474 Arkusz danych(HTML) 5 Page - Pulse A Technitrol Company |
5 / 7 page T604.F (05/12) 5 pulseelectronics.com ISDN S-Interface Transformers 2. (continued from previous page) A recommended test set up is shown in Figure 2. A high inductance “low frequency” is common mode choke, such as PE- 65950NL or PE-65853NL, is recommended to improve balance, or to correct inherent unbalances of some circuits. 3. Impedance Requirements - The requirements for minimum impedance in the inactive and powered- down states are expressed by impedance templates for both transmitter and receiver in NT and TE. At the lowfrequencyendof1MHz,itisreasonableto assume that the impedance seen from the line is entirely capacitive. The maximum capacitance budget, derived from the templates, is somewat different for the NT and the TE. Contributors to the total capacitance are: the chip output, the protection circuit, the transformer, common mode choke, and any other element that may be present. In the TE case, there is also the maximum allowable TE cord impedance. Here the maximum buget is 800pF. As a rule, the capacitances should be kept as low as possible in the interface circuit design. With the specified transformer capacitances, it is possible to remain within budget and have a reasonable margin for measurement errors. 4. Common Mode Chokes - The “high frequency” 4-wire common mode chokes shown on pages 7 and 8 provide an effective means of compliance with national andinternationalregulationsonEMI.Theyaredesigned to be used in conjunction with either Pulse’s ISDN S-Interface or T1/CEPT transformers as shown in Figure 1. A high inductance “low frequency” common mode choke is recommended to improve balance, or to correct inherent unbalances of some ISDN S-Interface circuits. 5. Surge Voltage Capability for Transformers and Chokes •LongitudinalVoltagePeak:2,400V10/700 μsec •MetallicVoltagePeak:800V10/560 μsec 6. Behavior Under Fault Conditions - Telephony voltages may accidentally appear on the ISDN S-Interface line to the transformer. The transformer will withstand a DC current of 0.5 Amps for 15 minues without permanent damage. Such current may be cauased by the telephone central battery. The transformer will also survive ringing voltages. These are nominally 120Vor200Vmaximumat20to60Hz,limitedby 1500W resistive or 400 to 600W inductive limiting. These may cause peak currents. 7. Flammability-Materialsusedintheproductsare recognizedUL94-VO.Productsmeettherequirements of IEC 695-2-2 (Needle Flame Test). Surface Mount, Dual, 2000Vrms Out HP-8751A Network Analyzer RB A VT EL ISM-1 Pri Sec Terminating Resistor ISM-1 = Wandel and Goltermann Signal Balance Ratio Bridge Figure 2. Longitudinal Balance Test Circuit |
Podobny numer części - MC145474 |
|
Podobny opis - MC145474 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |