pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 145

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

•
Figure 64
Receiver
The receiver of the S-transceiver is symmetrical. 10 k
recommended in each receive path. It is preferable to split the resistance into two
resistors for each line. This allows to place a high resistance between the transformer
and the diode protection circuit (required to pass 96 kHz input impedance test of
ITU I.430 [6] and ETS 300012-1). The remaining resistance (1.8 k ) protects the S-
transceiver itself from input current peaks.
•
Figure 65
Data Sheet
SR1
SX1
SR2
SX2
External Circuitry S-Interface Transmitter
External Circuitry S-Interface Receiver
20...40
1k8
1k8
47
47
V
V
DD
DD
131
GND
GND
8k2
8k2
Operational Description
overall resistance are
extcirc_S.vsd
extcirc_S.vsd
DC Point
DC Point
2 : 1
2 : 1
PEF 81902
2001-11-12