參數(shù)資料
型號: AD9557BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 84/92頁
文件大?。?/td> 0K
描述: IC CLOCK TRANSLATOR 40LFCSP
產品變化通告: Minor Mask Change 11/Apr/2012
標準包裝: 1
類型: 時鐘/頻率轉換器
PLL:
主要目的: 以太網(wǎng),SONET/SDH
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,HSTL,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 1.25GHz
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: 40-VFQFN 裸露焊盤,CSP
供應商設備封裝: 40-LFCSP-VQ(6x6)
包裝: 托盤
Data Sheet
AD9557
Rev. B | Page 85 of 92
DPLL Status, Input Reference Status, Holdover History, and DPLL Lock Detect Tub Levels (Register 0x0D08 to Register 0x0D14)
Table 105. DPLL Status
Address
Bits
Bit Name
Description
0x0D08
7
Reserved
6
Offset slew limiting
The current closed-loop phase offset is rate limited
5
Frequency lock
The DPLL has achieved frequency lock
4
Phase lock
The DPLL has achieved phase lock
3
Loop switching
The DPLL is in the process of a reference switchover
2
Holdover
The DPLL is in holdover mode
1
Active
The DPLL is active (that is, operating in a closed-loop condition)
0
Freerun
The DPLL is free run (that is, operating in an open-loop condition)
0x0D09
[7:6]
Reserved
Default: 0b
5
Frequency clamped
The upper or lower frequency tuning word clamp is in effect
4
History available
There is sufficient tuning word history available for holdover operation
[3:2]
Active reference priority
Priority value of the currently active reference
00 = highest priority
11 = lowest priority
1
Reserved
Default: 0b
0
Current active reference
Index of the currently active reference
0 = Reference A
1 = Reference B
Table 106. Reserved Register
Address
Bits
Bit Name
Description
0x0D0A
[7:0]
Reserved
Table 107. Input Reference Status
Address
Bits
Bit Name
Description
0x0D0B
7
B valid
REFB is valid for use (it is unfaulted, and its validation timer has expired).
6
B fault
REFB is not valid for use.
5
B fast
This bit indicates that the frequency of REFB is higher than allowed by its profile settings.
4
B slow
This bit indicates that the frequency of REFB is lower than allowed by its profile settings.
3
A valid
REFA is valid for use (it is unfaulted and its validation timer has expired).
2
A fault
REFA is not valid for use.
1
A fast
This bit indicates that the frequency of REFA is higher than allowed by its profile settings.
0
A slow
This bit indicates that the frequency of REFA is lower than allowed by its profile settings.
0x0D0C
[7:0]
Reserved
Reserved.
Table 108. Holdover History1
Address
Bits
Bit Name
Description
0x0D0D
[7:0]
Tuning word readback
Tuning word readback bits[7:0]
0x0D0E
[7:0]
Tuning word readback bits[15:8]
0x0D0F
[7:0]
Tuning word readback bits[23:9]
0x0D10
[7:0]
Tuning word readback bits[31:24]
1 Note that these registers contain the current 30-bit DCO frequency tuning word that is generated by the tuning word history logic.
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