L3234 STMicroelectronics, L3234 Datasheet - Page 15

• Manufacturer Part Number: L3234
• Description: HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS
• Manufacturer: STMicroelectronics

Figure 13: DC characteristic in Active Mode with two different values of limiting current (30mA and 70 mA).
Figure 14: Line current versus loop resistance with two different values of limiting current (30mA and
AC characteristic
A simplified AC model of the transmission circuits
is shown in figure 15.
Where :
V
V
V
E
Z
rx
tx
l
g
l
is the received signal
is the transmitted signal
is the AC transversal voltage at line terminations.
is the line open circuit AC voltage
is the line impedance
70mA)
R
Z
Z
Z
R
I
CAC AC feedback current decoupling
l
/50
B
A
AC
p
PC
are the protection resistors
is the line impedance balancing network
is the SLIC impedance balancing network
program the AC line termination impedance
used for external protection resistors insertion
loss compensation
is the AC transversal current divided by 50
L3234 - L3235
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