PEF2256EV22NP Lantiq, PEF2256EV22NP Datasheet - Page 395

• Manufacturer Part Number: PEF2256EV22NP
• Manufacturer: Lantiq

Specifications of PEF2256EV22NP

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Supplier Unconfirmed

Line Interface Mode 2 (Read/Write)
Value after reset: 20
LIM2
LBO(2:1)
SLT(1:0)
SCF
Data Sheet
LBO2
7
Line Build-Out
In long-haul applications a transmit filter can be optionally placed on
the transmit path to attenuate the data on pins XL1/2. Selecting the
transmitter attenuation is possible in steps of 7.5 dB at 772kHz which
is according to FCC68 and ANSI T1.403.
To meet the line build-out defined by ANSI T1.403 registers XPM(2:0)
should be programmed as follows (based on 2
00 =
01 =
10 =
11 =
Receive Slicer Threshold
00 = The receive slicer generates a mark (digital one) if the voltage
01 = The receive slicer generates a mark (digital one) if the voltage
10 = The receive slicer generates a mark (digital one) if the voltage
11 = The receive slicer generates a mark (digital one) if the voltage
Select Corner Frequency of DCO-R
Setting this bit reduces the corner frequency of the DCO-R circuit by
the factor of ten to 0.6 Hz.
Note: Reducing the corner frequency of the DCO-R circuitry
Note: LIM2.SCF is ignored, if CMR2.ECFAR is set.
LBO1
H
at RL1/2 exceeds 55% of the peak amplitude.
at RL1/2 exceeds 67% of the peak amplitude (may be used in
some T1/J1 applications).
at RL1/2 exceeds 50% of the peak amplitude (default,
recommended in T1/J1 mode).
at RL1/2 exceeds 45% of the peak amplitude.
increases the synchronization time before the frequencies are
synchronized.
0.0 dB
7.5 dB
-15 dB
-22.5 dB
SLT1
SLT0
395
XPM(2:0): refer to
XPM(2:0) = 00
XPM(2:0) = 01
XPM(2:0) = 00
SCF
ELT
H
H
H
, 01
, 11
, 01
Table 70
MPAS
H
H
H
, 8C
, 8C
, 07
transmit resistors):
H
Rev. 1.1, 2005-06-13
H
H
T1/J1 Registers
PEF 2256 H/E
LOS1
on
0
page
FALC
386.
(3A)
®
56