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參數資料
型號: W9961CF
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: H.263/H.261 Video Codec
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP208
封裝: 28 X 28 MM, 2.60 MM HEIGHT, PLASTIC, QFP-208
文件頁數: 53/65頁
文件大小: 344K
代理商: W9961CF
W9961CF
- 53 -
7.11 PLL (Phase Locked Loop)
1
(M+1)
DETECT
PHASE
PUMP
CHARGE
FILTER
LOOP
VCO
1
(N2+1)
1
2
K
f
REF
f
OUT
1
2
N1
Figure 7.17 PLL Block Diagram
The built-in PLL frequency synthesizer is used to generate the internal MCLK clock. A stable
reference frequency is required by dividing VOCLK by 2 (VOCLK/2 with typical 13.5 Mhz frequency)
as the reference clock input for the PLL. The output frequency resulting from a given set of
parameters is specified by the following formula:
f
N
1
M
f
OUT
N
K
REF
=
+ )
1
2
(
+ )
2
2
×
1
×
×
(
where M is a 6-bit value that can be programmed with any integer value from 1 to 63, N1 is a 2-bit
value that can be programmed with any integer value from 0 to 3, N2 is a 6-bit value that can be
programmed with any integer value from 1 to 127, and K is a 2-bit value that can be programmed
with any integer value from 0 to 3.
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相關代理商/技術參數
參數描述
W9966CF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W9966TF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W99681CF 制造商:WINBOND 制造商全稱:Winbond 功能描述:JPEG USB Dual Mode Camera Chip
W99685 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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