PEF22558EV11GXP Lantiq, PEF22558EV11GXP Datasheet - Page 45

• 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
10.1
For optimized return loss the transmit output resistance can be configured by using the
pins XL3 and XL4 as shown in
Generic E1/T1/J1 applications can be built where the operation mode is selected by
software without the need for external hardware changes. Note that shorts between XL1
and XL2 are not detected by the transmit line monitor, see chapter 10.2.
The principle transmitter circuit diagram is shown in
applications pins XL3 and XL4 can be left open. The serial resistance can be selected
by register programming as shown in
Figure 29
Table 14
Parameter
Serial Resistance,
accuracy
1) This value refers to an ideal transformer without any parasitics. Any transformer resistance or other parasitic
Delta Sheet
resistances have to be taken into account when calculating the final value of the output serial resistors.
Line Interface
Tunable Transmit Line Output Resistance
1%
Transmit Impedances
Serial Impedance Values
XL3
XL1
XL2
XL4
Symbol
R
SER
Figure
1%
1%
R
R
SER
SER
Values
2
2
7.5
1)
1)
Table
29.
1)
45
14.
Unit Note/Test Condition
Generic E1/T1/J1
PC6.TSRE = 1 (E1)
PC6.TSRE = 0 (T1/J1)
Non generic T1/J1
PC6.TSRE = 0
Non generic E1
PC6.TSRE = 0
Figure
OctalFALC_Tx_2
29. For non-generic
Rev. 2.0, 2005-05-03
OctalFALC
PEF 22558 E
Line Interface
TM