AD9557
目录
特点................................................. ............................................. 1
应用................................................. ...................................... 1
概述................................................ ......................... 1
功能框图............................................... ............... 1
修订历史................................................ ............................... 3
规格................................................. .................................... 4
电源电压................................................ ............................... 4
电源电流................................................ .............................. 4
功耗................................................ ......................... 5
逻辑输入（ RESET ， SYNC ， PINCONTROL ， M3至M0 ） 5 ....
逻辑输出（ M3为M0 ， IRQ ） ......................................... 6 .......
系统时钟输入（ XOA ， XOB ） .......................................... 6 ...
参考输入................................................ ........................... 7
参考监视器................................................ ...................... 8
参考切换技术指标.......................................... 8
分布时钟输出............................................... ......... 9
数字功能的持续时间........................................ 10
数字PLL ................................................ .................................. 11
数字PLL锁定检测.............................................. ........ 11
缓缴规格................................................ ............. 11
串行端口规格， SPI模式...................................... 12
串行端口规格-I
2
C模式...................................... 13
抖动生成................................................ ......................... 13
绝对最大额定值............................................... ........... 16
ESD注意事项................................................ ................................ 16
引脚配置和功能描述........................... 17
典型性能特征........................................... 19
输入/输出端接建议.......................... 24
入门................................................ ................................ 25
芯片的电源监控和启动............................................. 25
多功能引脚在复位/上电................................... 25
器件寄存器编程使用寄存器设置文件.. 25
寄存器编程概述............................................. 25
工作原理............................................... ....................... 28
概述................................................. ..................................... 28
参考时钟输入............................................... ............... 29
参考监视器................................................ .................... 29
参考配置文件................................................ ....................... 29
参考切换................................................ ................. 29
数字PLL （ DPLL ）核心............................................ .............. 30
数据表
闭环控制状态机.............................................. ....... 32
系统时钟（ SYSCLK ） ............................................. ................... 33
系统时钟输入............................................... .................... 33
系统时钟乘法器............................................... ............. 33
输出PLL （ APLL ） ............................................. .......................... 35
时钟分配................................................ .......................... 36
时钟分频器................................................ ............................ 36
输出掉电.............................................. ................... 36
输出使能................................................ ............................. 36
输出模式................................................ .............................. 36
时钟分配同步........................................ 36
状态和控制............................................... ........................... 37
多功能引脚（ M3至M0 ） ........................................... .... 37
IRQ引脚................................................ ........................................ 37
看门狗定时器................................................ ......................... 38
EEPROM ................................................. .................................... 38
串行控制端口............................................... .......................... 44
SPI / I2C端口选择............................................. ................... 44
SPI串行端口操作.............................................. ............ 44
I
2
串行口操作.............................................. ............ 48
编程的I / O寄存器............................................ ....... 51
缓冲/有效寄存器.............................................. ............ 51
自动清除寄存器................................................ ..................... 51
注册访问限制............................................... ....... 51
热性能................................................ .................... 52
供电分区............................................... .................. 53
推荐配置为3.3 V开关电源.. 53
配置1.8 V电源............................................. ... 53
引脚编程功能说明............................................. 54
片上ROM功能概述..................................... 54
硬引脚编程模式.............................................. .... 55
软引脚编程模式概述................................. 55
注册地图................................................ ................................... 56
寄存器映射位说明.............................................. ........ 65
串行端口配置（寄存器0x0000到
寄存器0×0005 ） .............................. .......................... 65
芯片版本（注册0x000A ） ......................................... 65
时钟部分序列ID （注册0x000C到
注册0x000D ） .............................. ......................... 65
系统时钟（注册0100至寄存器0x0108 ） ............. 66
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