參數(shù)資料
型號(hào)： MAX3872EGJ
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： Multirate Clock and Data Recovery with Limiting Amplifier
中文描述： CLOCK RECOVERY CIRCUIT, QCC32
封裝： 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32
文件頁(yè)數(shù)： 10/13頁(yè)
文件大小： 580K
代理商： MAX3872EGJ
M
Setting the Loop Filter
The MAX3872 is designed for regenerator and receiver
applications. Its fully integrated PLL is a classic 2nd-order
feedback system, with a jitter transfer bandwidth (J
BW
)
below 2.0MHz. The external capacitor (C
FIL
) connected
from FIL to VCC_VCO sets the PLL loop damping. Note
that the PLL jitter transfer bandwidth does not change as
C
FIL
changes, but the jitter peaking, acquisition time, and
loop stability are affected. Figures 6 and 7 show the
open-loop and closed-loop transfer functions.
The PLL zero frequency, f
Z
, is a function of external
capacitor C
FIL
, and can be approximated according to:
For an overdamped system (f
Z
/ J
BW
< 0.25), the jitter
peaking (J
P
) of a 2nd-order system can be approximat-
ed by:
where J
BW
is the jitter transfer bandwidth for a given
data rate.
The recommended value of C
FIL
= 0.82μF is to guarantee
a maximum jitter peaking of less than 0.1dB for all data
rates. Decreasing C
FIL
from the recommended value
decreases acquisition time, with the tradeoff of increased
peaking. For data rates greater than OC-3, C
FIL
can be
less than 0.82μF and still meet the jitter-peaking specifi-
cation.
Excessive reduction of C
FIL
might cause PLL instability.
C
FIL
must be a low-TC, high-quality capacitor of type
X7R or better.
J
f
J
P
Z
BW
=
+
20
1
log
f
C
)
Z
FIL
=
1
2 650
(
Multirate Clock and Data Recovery
with Limiting Amplifier
10
______________________________________________________________________________________
Table 3. Holdover Frequency Settings
REFERENCE CLOCK FREQUENCY (MHz)
666.51
666.51
666.51
622.08/625
622.08/625
622.08
622.08
166.63
166.63
166.63
155.52/156.25
155.52/156.25
155.52
155.52
SCLKO FREQUENCY
2.667GHz
666.51MHz
166.63MHz
1.244/1.25GHz
2.488GHz/2.5GHz
622.08MHz
155.52MHz
2.67GHz
666.51MHz
166.63MHz
1.244/1.25GHz
2.488GHz/2.5GHz
622.08MHz
155.52MHz
RS1
0
0
1
1
0
0
1
0
0
1
1
0
0
1
RS2
0
1
0
1
0
1
0
0
1
0
1
0
1
0
RATESET
1
1
1
0
0
0
0
1
1
1
0
0
0
0
FREFSET
0
0
0
0
0
0
0
1
1
1
1
1
1
1
C
FIL
= 0.82
μ
F
f
Z
= 299Hz
C
FIL
= 0.01
μ
F
f
Z
= 24.5kHz
H
O
(j2
π
f) (dB)
O
1000
f (kHz)
100
10
1
DATA RATE: 2.488Gbps
Figure 6. Open-Loop Transfer Function
C
FIL
= 0.82
μ
F
H(j2
π
f) (dB)
1000
100
10
1
f (kHz)
-3
0
C
C
FIL
= 0.01
μ
F
DATA RATE: 2.488Gbps
Figure 7. Closed-Loop Transfer Function
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