pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 93

• Manufacturer Part Number: pef22504
• Description: Quad E1/t1/j1 Line Interface Component For Long- And Short-haul Applications Pef 22504 E, Pef 22504 Ht, Version 2.1
• Manufacturer: Infineon Technologies Corporation

The DCO-R circuitry attenuates the incoming jittered clock starting at its corner frequency with 20 dB per decade
fall-off. Wander with a jitter frequency below the corner frequency is passed unattenuated. The intrinsic jitter in the
absence of any input jitter is < 0.02 UI.
The corner frequency of the DCO-R can be configured in a wide range, see
attenuator PLL in the transmit path, so called as DCO-X, is equivalent to the DCO-R so that the principle for its
configuring is the same.
Table 23
CMR6.DCOCOMPN CMR2.ECFAR
X
X
0
1
After reset the corner frequencies are 2 Hz in E1 and 6 Hz in T1/J1 mode and can be switched to 0.2 Hz in E1
mode or 0.6 Hz n T1 mode by setting the register bit LIM2.SCF for the DCO-R or the register bit CMR5.SCFX for
the DCO-X respectively. A logical table builds the integral (I) and proportional (P) parameter for the PI filter of the
DCO-R or DCO-X, see
If the register bits CMR2.ECFAR or CMR2.ECFAX are set for the DCO-R or the DCO-X respectively, the corner
frequencies can be configured in a range between 2 Hz and 0.2 Hz using the register bits CMR3.CFAR(3:0) or
CMR3.CFAX(3:0) respectively, see CMR3,
parameter for the PI filter of the DCO-R or DCO-X out of the settings in CMR3.CFAR(3:0) or CMR3.CFAX(3:0)
respectively.
If additionally to CMR2.ECFAR or CMR2.ECFAX the bit CMR6.DCOCOMPN (CMR6) is set, which is valid for the
DCO-R and the DCO-X, the corner frequencies and attenuation factors can be programmed in a wide range using
the register bits CMR3.CFAR(3:0) and CMR4.IAR(4:0) for the DCO-R and CMR3.CFAX(3:0) and CMR5.IAX(4:0)
for the DCO-X. The settings in CMR3.CFAR(3:0)/CFAX(3:0) build the proportional parameter, the settings in
CMR4.IAR(4:0) and CMR5.IAX(4:0) build the integral parameter for the PI filters, independent from another.
Data Sheet
Overview DCO-R (DCO-X) Programming
(CMR2.ECFAX)
0
0
1
1
Figure
29.
LIM2.SCF
(CMR6.SCFX)
0
1
X
X
CMR4
and CMR5. A logical table builds the integral and proportional
93
CMR3.CFAR(3:0)
(CMR3.CFAX(3:0))
Not used
Not used
7
´4
´0
as proportional
parameter
´9
´8
´6
´4
´3
´2
´1
H
H
H
H
H
H
H
H
H
H
´
´
´ ...´F
´
´
´
´
´
´
´
H
´ , used
Table 23
CMR4.IAR(3:0)
(CMR5.IAX(4:0))
Not used
Not used
Not used
´00
used as integral
parameter
´19
´13
´12
´0F
´0C
´0A
´08
H
H
H
H
H
H
H
H
´ ...´1F
´
´
´
´
´
´
and
Functional Description
H
´
Rev. 1.3, 2006-01-25
Figure
Corner-
frequencies
of DCO-R
(DCO-X)
E1 / T1
2 Hz / 6 Hz
0.2 Hz / 0.6 Hz
0.2 Hz / 0.6 Hz
2 Hz / 6 Hz
Range 0.2 Hz
... 100 Hz
0.2 Hz
0.6 Hz
2 Hz
6 Hz
25 Hz
50 Hz
100 Hz
QuadLIU
PEF 22504
29. The jitter
TM