參數(shù)資料
型號(hào): SY89538L
廠商: Micrel Semiconductor,Inc.
英文描述: 3.3V PRECISION LVPECL AND LVDS PROGRAMMABLE MULTIPLE OUTPUT BANK CLOCK SYNTHESIZER AND FANOUT BUFFER WITH ZERO DELAY
中文描述: 3.3精密LVPECL和LVDS可編程多個(gè)OUTPUT銀行時(shí)鐘合成器與扇出緩沖器與零延遲
文件頁數(shù): 14/23頁
文件大小: 628K
代理商: SY89538L
Micrel, Inc.
Zero Delay FBIN Input
The SY89538L features a zero delay MUX that forces
the output to be at the same phase relationship as the
reference. This effectively configures the SY89538L
as a zero delay buffer when FBSEL is logic HIGH and
the output is fed into the feedback input FBIN as
shown in Figures 3a and 3b.
SY89538L
October 2005
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
14
Figure 3a. Zero Delay Mode
(LVDS Output)
Figure 3b. Zero Delay Mode
(LVPECL Output)
How Does Zero Delay Work
From the block diagram,
Divider
FBK
Divider
Ref.
FBIN
RFCK
f
f
and
f
f
FBK
REF
=
=
When the PLL is locked, f
REF
= f
FBK
and since Ref.
Divider = FBK Divider, f
RFCK
is forced to equal
f
FBIN
.
In zero delay mode, f
OUT
is fed into FBIN, therefore,
f
RFCK
is forced to equal f
OUT
.
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