AD9549
目录
特点................................................. ............................................. 1
应用................................................. ...................................... 1
概述................................................ ......................... 1
基本框图............................................... ......................... 1
修订历史................................................ ............................... 3
规格................................................. .................................... 4
直流规范................................................ ......................... 4
交流规范................................................ .......................... 6
绝对最大额定值............................................... ............. 9
热阻................................................ ...................... 9
ESD注意事项................................................ .................................. 9
引脚配置和功能描述........................... 10
典型性能特征........................................... 13
输入/输出端接建议.......................... 16
工作原理............................................... ....................... 17
概述................................................. ..................................... 17
数字PLL内核（ DPLLC ） ............................................ ............ 17
鉴相器................................................ ............................ 21
数字环路滤波器系数.............................................. .. 22
闭环相位偏移............................................. ............ 24
锁定检测................................................ ............................ 24
参考监视器................................................ .................... 26
参考切换................................................ ................. 27
缓缴................................................. ..................................... 29
输出频率范围控制............................................ 32
重建滤波器................................................ ................. 32
FDBK_IN输入................................................ ........................ 33
参考输入................................................ ......................... 33
系统时钟输入................................................ ........................... 33
谐波杂散降低............................................... ......... 35
输出时钟驱动器和2 ×倍频............. 36
频率回转限制器............................................... .............. 37
频率估计................................................ .................. 37
状态和警告............................................... .................... 39
热性能................................................ .................... 41
上电............................................... .......................................... 42
上电复位.............................................. ............................ 42
编程序列................................................ ............ 42
供电分区............................................... .............. 43
3.3 V电源............................................... ............................... 43
1.8 V电源............................................... ............................... 43
串行控制端口............................................... .......................... 44
串行控制端口引脚说明....................................... 44
串行控制端口的操作............................................. 44
指令字（ 16位） ........................................... ..... 45
MSB / LSB优先传输............................................. .............. 45
I / O寄存器映射............................................. ............................... 48
I / O寄存器说明............................................. ................. 53
串行端口配置（寄存器0x0000到注册
0x0005) ........................................................................................ 53
掉电复位（寄存器0×0010到寄存器0x0013 ）
....................................................................................................... 53
系统时钟（寄存器为0x0020至寄存器0x0023 ） ............. 54
数字锁相环控制和分频器（寄存器0100到
注册0x0130 ） .............................. .......................... 55
自由运行（单频）模式（注册0x01A0来注册
0x01AD ） ................................................ ...................................... 61
参考选择/缓缴（注册0x01C0到注册
0x01C3 ） ................................................ ........................................ 62
倍频器和输出驱动器（寄存器0x0200至寄存器
0x0201) ........................................................................................ 63
监控（寄存器0x0300至寄存器0x0335 ） ....................... 64
校准（用户可访问的修剪） （注册的0x0400到
注册0x0410 ） .............................. .......................... 70
谐波杂散抑制（寄存器0x0500至寄存器
0x0509) ........................................................................................ 71
应用信息................................................ .............. 73
示例应用电路............................................... ...... 73
外形尺寸................................................ ....................... 74
订购指南................................................ .......................... 74
修订版D |页76 2
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