參數(shù)資料
型號： LUCW3000CCN-TR
英文描述： W3000 PLL Dual-Band Frequency Synthesizer
中文描述： W3000鎖相環(huán)雙頻段頻率合成器
文件頁數(shù)： 8/28頁
文件大小： 327K
代理商： LUCW3000CCN-TR
Advance Data Sheet
December 1999
W3000 PLL Dual-Band Frequency Synthesizer
Lucent Technologies Inc.
8
PLL Programming Information
The oscillator frequency is selected according to the following expression:
[
R
where:
]
f
A
)
M
*
(
f
REF
VCO
+
=
f
VCO
= VCO frequency
P/(P + 1) = Dual modulus prescaler
M
= Programmable counter ratio (2 to 2047), M > A
A
= Swallow counter ratio (0 to M – 1 or 127)
f
REF
= External reference oscillator frequency
R
= Reference counter ratio (2 to 2047)
Example
You wish to have a VCO operating at 1172 MHz, ability to step the frequency in 200 kHz steps, and a reference
clock at 13 MHz.
Step 1:
Calculate the reference counter ratio R
65
kHz
200
MHz
13
R
=
=
Step 2: Calculate M & A
[
]
*
R
f
A
)
M
*
(
f
REF
VCO
+
=
[
]
*
65
13
A
)
M
*
64
(
1172
+
=
5860
13
65
*
1172
)
A
M
*
64
(
=
=
+
64
36
91
64
5860
=
M is an integer, and so is A; therefore, M = 91, and A = 36.
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