PSB21383HV1.3XT Infineon Technologies, PSB21383HV1.3XT Datasheet - Page 104
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PSB21383HV1.3XT
Manufacturer Part Number
PSB21383HV1.3XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.PSB21383HV1.3XT.pdf
(270 pages)
Specifications of PSB21383HV1.3XT
Number Of Line Interfaces
1
Control Interface
HDLC
Lead Free Status / Rohs Status
Compliant
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Data Sheet
2.3.13
For both, receive and transmit direction a 1:1 transformer is used to connect the SCOUT
transceiver to the 4 wire S/T interface. The connections of the line transformers are
shown in figure 58.
Figure 58
Connection of the Line Transformers and Power Supply to the SCOUT
2.3.13.1
The ITU-T I.430 specification for both transmitter and receiver impedances in TEs results
in a conflict with respect to external S-protection circuitry requirements:
– To avoid destruction or malfunction of the S-device it is desirable to drain off even
– To meet the 96 kHz impedance test specified for transmitters and receivers (for TEs
This requirement results from the fact that this test is also to be performed with no supply
voltage being connected to the TE. Therefore the second reference point for
overvoltages V
greater than the combined forward voltages of the diodes, a current exceeding the
specified one may pass the protection circuit.
The following recommendations aim at achieving the highest possible device protection
against overvoltages while still fulfilling the 96 kHz impedance tests.
small overvoltages reliably.
only, ITU-T I.430 sections 8.5.1.2a and
dimensioned such that voltages below 1.2 V (ITU-T I.430 amplitude) x transformer
ratio are not affected.
Interface Circuitry
External Protection Circuitry
DD
, is tied to GND. Then, if the amplitude of the 96 kHz test signal is
94
8.6.1.1) the protection circuit must be
PSB 21381/2
PSB 21383/4
Interfaces
2001-03-12
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