参数资料
型号: AD9557BCPZ
厂商: Analog Devices Inc
文件页数: 84/92页
文件大小: 0K
描述: IC CLOCK TRANSLATOR 40LFCSP
产品变化通告: Minor Mask Change 11/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
输入: CMOS,LVDS,LVPECL
输出: CMOS,HSTL,LVDS
电路数: 1
比率 - 输入:输出: 2:2
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: 40-VFQFN 裸露焊盘,CSP
供应商设备封装: 40-LFCSP-VQ(6x6)
包装: 托盘
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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