参数资料
型号: AD9557BCPZ
厂商: Analog Devices Inc
文件页数: 79/92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
AD9557
Data Sheet
Rev. B | Page 80 of 92
Reset Functions (Register 0x0A03)
Table 89. Reset Functions
Address
Bits
Bit Name
Description
0x0A03
(autoclear)
7
Reserved
Default: 0b.
6
Clear LF
Setting this bit clears the digital loop filter (intended as a debug tool).
5
Clear CCI
Setting this bit clears the CCI filter (intended as a debug tool).
4
Reserved
Default: 0b.
3
Clear auto sync
Setting this bit resets the automatic synchronization logic (see Register 0x0500).
2
Clear TW history
Setting this bit resets the tuning word history logic (part of holdover functionality).
1
Clear all IRQs
Setting this bit clears the entire IRQ monitor register (Register 0x0D02 to Register 0x0D07). It
is the equivalent of setting all the bits of the IRQ clearing register (Register 0x0A04 to
0x0A0D).
0
Clear watchdog timer
Setting this bit resets the watchdog timer (see Register 0x0210 and Register 0x0211). If the
timer times out, it simply starts a new timing cycle. If the timer has not yet timed out, it restarts
at time zero without causing a timeout event. Continuously resetting the watchdog timer at
intervals of less than its timeout period prevents the watchdog timer from generating a
timeout event.
IRQ Clearing (Register 0x0A04 to Register 0x0A09)
The IRQ clearing registers are identical in format to the IRQ monitor registers (Register 0x0D02 to Register 0x0D09). When set to Logic 1,
an IRQ clearing bit resets the corresponding IRQ monitor bit, thereby canceling the interrupt request for the indicated event. The IRQ clearing
register is an autoclearing register.
Table 90. IRQ Clearing for SYSCLK
Address
Bits
Bit Name
Description
0x0A04
[7:6]
Reserved
5
SYSCLK unlocked
Clears SYSCLK unlocked IRQ
4
SYSCLK locked
Clears SYSCLK locked IRQ
3
APLL unlocked
Clears Output PLL unlocked IRQ
2
APLL locked
Clears Output PLL locked IRQ
1
APLL Cal ended
Clears APLL calibration complete IRQ
0
APLL Cal started
Clears APLL calibration started IRQ
Table 91. IRQ Clearing for Distribution Sync, Watchdog Timer and EEPROM
Address
Bits
Bit Name
Description
0x0A05
[7:5]
Reserved
4
Pin program end
Clears pin program end IRQ
3
Sync clock distribution
Clears distribution sync IRQ
2
Watchdog timer
Clears watchdog timer IRQ
1
EEPROM fault
Clears EEPROM fault IRQ
0
EEPROM complete
Clears EEPROM complete IRQ
Table 92. IRQ Clearing for the Digital PLL
Address
Bits
Bit Name
Description
0x0A06
7
Switching
Clears switching IRQ
6
Closed
Clears closed IRQ
5
Freerun
Clears free run IRQ
4
Holdover
Clears holdover IRQ
3
Frequency unlocked
Clears frequency unlocked IRQ
2
Frequency locked
Clears frequency locked IRQ
1
Phase unlocked
Clears phase unlocked IRQ
0
Phase locked
Clears phase locked IRQ
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