参数资料
型号: AD9558BCPZ
厂商: Analog Devices Inc
文件页数: 101/104页
文件大小: 0K
描述: IC CLOCK TRANSLATOR 64LFCSP
产品变化通告: AD9558 Minor Metal Mask Change 17/Apr/2012
标准包装: 1
类型: 时钟/频率转换器
PLL:
主要目的: 以太网,SONET/SDH,Stratum
输入: CMOS,LVDS,LVPECL
输出: CMOS,HSTL,LVDS
电路数: 1
比率 - 输入:输出: 4:6
差分 - 输入:输出: 是/是
频率 - 最大: 1.25GHz
电源电压: 1.71 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 托盘
AD9558
Data Sheet
Rev. B | Page 96 of 104
DPLL Status, Input Reference Status, Holdover History, and DPLL Lock Detect Tub Levels (Register 0x0D08 to Register 0x0D14)
Table 108. DPLL Status1
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
[1:0]
Current active reference
Index of the currently active reference
00 = Reference A
01 = Reference B
10 = Reference C
11 = Reference D
1
Note that the user must issue an I/O update by writing 0x01 to Register 0x0005 to update the status of these registers.
Table 109. Reserved Register
Address
Bits
Bit Name
Description
0x0D0A
[7:0]
Reserved
Reserved.
Table 110. Input Reference Status1
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
[7:4]
Same as Register 0xDOB[7:4] but for REFD instead of REFB .
[3:0]
Same as Register 0xDOB[3:0] but for REFC instead of REFA.
1
Note that the user must issue an I/O update by writing 0x01 to Register 0x0005 to update the status of these registers.
Table 111. Holdover History1
Address
Bits
Bit Name
Description
0x0D0D
[7:0]
Holdover history
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[29:24]
1
Note that these registers contain the current 30-bit DCO frequency tuning word generated by the tuning word history logic.
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