參數(shù)資料
型號: AD9548BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 38/112頁
文件大小: 0K
描述: IC CLOCK GEN/SYNCHRONIZR 88LFCSP
產(chǎn)品變化通告: AD9548 Mask Change 20/Oct/2010
標(biāo)準(zhǔn)包裝: 1
類型: 時鐘/頻率發(fā)生器,同步器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 750kHz
電源電壓: 1.71 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 88-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 88-LFCSP-VQ(12x12)
包裝: 托盤
Data Sheet
AD9548
Rev. E | Page 31 of 112
The promoted priority parameter allows the user to assign a
higher priority to a reference after it becomes the active
reference. For example, suppose four references have a selection
priority of 3 and a promoted priority of 1, and the remaining
references have a selection priority or 2 and a promoted priority
of 2. Now, assume that one of the Priority 3 references becomes
active because all of the Priority 2 references have failed. Some-
time later, however, a Priority 2 reference becomes valid. The
switchover logic normally attempts to automatically switch over
to the Priority 2 reference because it has higher priority than the
presently active Priority 3 reference. However, because the
Priority 3 reference is active, its promoted priority of 1 is in
effect. This is a higher priority than the newly validated
reference’s priority of 2, so the switchover does not occur. This
mechanism enables the user to give references preferential
treatment while they are selected as the active reference. An
example of promoted vs. nonpromoted priority switching
appears in state diagram form in Figure 36. Figure 37 shows a
block diagram of the interrelationship between the reference
inputs, monitors, validation logic, profile selection, and priority
selection functionality.
A
ACTIVE
B
ACTIVE
C
ACTIVE
A FAULTED
B FAULTED
ALL VALID
INITIAL
STATE
A VALID
B VALID
A VALID
B VALID
INPUT
PRIORITY
PROMOTED
A0
0
B1
0
C2
1
D3
2
PRIORITY TABLE
COMMON
WITHOUT PROMOTION
WITH PROMOTION
080
22
-01
1
Figure 36. Example of Priority Promotion
PROFILE
SELECTION
VALIDATION
LOGIC
PRIORITY
SELECTION
÷R
MONITORS
A/AA
B/BB
C/CC
D/DD
TDC
LOOP
CONTROLLER
……
……
08
02
2-
01
2
Figure 37. Reference Clock Block Diagram
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