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MC145474 Arkusz danych(PDF) 5 Page - Pulse A Technitrol Company

Numer części MC145474
Szczegółowy opis  ISDN S-Interface Transformers
Download  7 Pages
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Producent  PULSE [Pulse A Technitrol Company]
Strona internetowa  http://www.pulseeng.com
Logo PULSE - Pulse A Technitrol Company

MC145474 Arkusz danych(HTML) 5 Page - Pulse A Technitrol Company

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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


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