PEF22558EV11GXP Lantiq, PEF22558EV11GXP Datasheet - Page 49

• Manufacturer Part Number: PEF22558EV11GXP
• Manufacturer: Lantiq

Specifications of PEF22558EV11GXP

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

10.4
In general the E1 line impedance operating modes with 75
or with 120
resistors in parallel or using special transformers with different transfer ratios in one
package (using center tap). These two options both provide only one analog front end
circuitry for both transmission media types.
The OctalFALC
need for external hardware changes by using the integrated analog switch and two
external resistors for line impedance matching, see application example in
default the analog switch is off.
This allows, for example, to switch between 100
coax) termination resistance using the external resistors R
see
LIM0.RTRS and by hardware using the receive Multi Function Ports. For that, only one
(but not more) of the receive Multi Function Ports must be configured as Receive Line
Termination (RLT) input. For controlling of the analog switch a logical equivalence is
build out of RLT and the register bit LIM0.RTRS if RLT is configured at one multi function
port.
If the analog switched is not used in an application, the pin RLS can be left open.
Figure 30
Delta Sheet
Table
Z
0
Receive Line Termination
19. The analog switch can be controlled by access to the register bit
(used with twisted pair cable) line termination are selectable by switching
Receiver Configuration with Integrated Analog Switch for
Receive Impedance Matching
TM
supports a software selectable generic E1/T1/J1 solution without the
externally
R
E1
R
E2
49
RLS
RL1
RL2
(T1/E1 twisted pair) and 75
internally
analog
switch
E1
= 100
(used with coaxial cable)
OctalFALC_Analog_Switches_3
Rev. 2.0, 2005-05-03
and R
OctalFALC
PEF 22558 E
Line Interface
Figure
E2
= 300
30. By
(E1
TM
,