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參數(shù)資料
| 型號： | TF1004A |
| 英文描述： | LG1600FXH Clock and Data Regenerator |
| 中文描述： | LG1600FXH時鐘和數(shù)據(jù)再生 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 492K |
| 代理商： | TF1004A |
Data Sheet
August 1999
LG1600FXH Clock and Data Regenerator
2
Lucent Technologies Inc.
Functional Description
The LG1600FXH Clock and Data Regenerator (CDR)
is a compact, single device solution to clock recovery
and data retiming in high-speed communication sys-
tems such as fiber-optic data links and long-span fiber-
optic regenerators and terminals. Using frequency and
phase-lock loop (FPLL) techniques, the device regen-
erates clean clock and error-free data signals from a
nonreturn-to-zero (NRZ) data input, corrupted by jitter
and intersymbol interference. The LG1600FXH
exceeds ITU-T/Bellcore jitter tolerance requirements
for SONET/SDH systems.
The device houses two integrated circuits on an alu-
mina substrate inside a hermetically sealed 3 cm
×
3 cm (1.2 in.
×
1.2 in.) surface-mount package: a GaAs
IC that contains the high-speed part of an FPLL as well
as a highly sensitive decision circuit; and a silicon bipo-
lar IC that contains a loop filter, acquisition, and signal
detect circuitry.
The two ac-coupled complementary data inputs can be
driven differentially as well as single ended. A dc feed-
back voltage V
–FB
maintains a data input threshold
V
–TH
(decision level) that is optimum for a wide range
of 50% duty cycle input levels (connect to V
–TH
). If
needed, the user can supply an external threshold to
compensate for different mark densities or distorted
input signals (see Figure 10).
Regenerated clock and data are available from comple-
mentary outputs that can either be ac coupled, to pro-
vide 50
output match, or dc coupled with 50
to
ground at the receiving end.
The second-order PLL filter bandwidth is set by the
user with an external resistor between pin 11 and
ground (required). An internal capacitor provides suffi-
cient PLL damping for most applications. In critical
applications, PLL damping can be increased using an
external capacitor between pins 9 and 11.
The device is powered by a single –5.2 V ECL compat-
ible supply and typically consumes 1.5 W.
The LG1600FXH comes in standard bit rates, but can
be factory tuned for any rate between 500 Mbits/s and
5500 Mbits/s.
A test fixture (TF1004A) with SMA connectors is avail-
able to allow quick evaluation of the LG1600FXH.
Theory of Operation
A digital regenerator has the task of retransmitting a bit
stream that is received from a remote source with the
same fidelity at which it was originally transmitted.
Two basic properties of the digital signal need to be
restored: the timing of the transitions between the bits
and the value of each bit.
12-3225(F)r.6
Figure 2. LG1600FXH Block Diagram
VCO
Q
D
V
+
CLKO
V
–
CLKO
31
26
D
FREQ. &
PHASE
DETECT.
90
°
LOOP CONTROL &
SIGNAL DETECT
11
9
7
V
REF
C
EXT
R
EXT
LOS
V
–TH
51
V
–FB
48
55
60
65
V
–IN
V
+IN
V
+FB
0.047
μ
F
0.047
μ
F
0.047
μ
F
0.047
μ
F
1 k
50
25 k
50
25 k
1 k
43
38
V
+
OUT
V
–
OUT
V
SS
35
0.047
μ
F
0.047
μ
F
0
°
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