Micro Networks
An Integrated Circuit Systems Company
FUNCTIONAL DESCRIPTION
LOOP FILTER
FIGURE 2
Rloop
OP_IN
Cloop
M2005-01
Preliminary Specifications
The M2005-01 requires the use of an external loop
filter via the provided filter pins. Due to the
differential design, the implementation requires two
identical RC filters as shown in Figure 2.
Rpost
nVc
Cpost
nOP_OUT
OP_OUT
Cpost
nOP_IN
Rloop
Cloop
Rpost
Vc
TABLE 1. RECOMMENDED LOOP FILTER VALUES
REF_CLK
Frequency
19.44MHz
VCSO
Frequency
622.0800MHz
M
N
FOUT
Rloop
Cloop
Rpost
Cpost
32
1
622.0800MHz
5kΩ
1MF
50kΩ
100pf
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