AD9957
目录
特点................................................. ............................................. 1
应用................................................. ...................................... 1
概述................................................ ......................... 1
功能框图............................................... ............... 1
规格................................................. .................................... 4
电气规格................................................ ............... 4
绝对最大额定值............................................... ............. 7
ESD注意事项................................................ .................................. 7
引脚配置和功能说明............................. 8
典型性能特征........................................... 11
操作模式............................................... ........................ 15
概述................................................. ..................................... 15
正交调制模式............................................... .. 16
的BlackFin接口（ BFI ） ............................................. ............... 17
内插DAC模式............................................... ........... 18
单色调模式............................................... ........................ 19
信号处理................................................ ............................ 20
并行数据时钟（ PDCLK ） ............................................ ....... 20
发送使能引脚（ TxEnable位置） ............................................ .. 20
输入数据汇编............................................... ................. 21
反CCI滤波器............................................... ........................ 22
固定内插器（ 4 × ） ............................................ .................. 22
可编程插值滤波器.......................................... 23
正交调制器................................................ .............. 23
DDS内核................................................ ..................................... 24
反Sinc滤波器............................................... ........................ 24
输出比例因子（ OSF ） ............................................ ............ 25
14位DAC .............................................. .................................... 25
辅助DAC ................................................ ........................ 25
RAM控制................................................ .................................. 26
RAM概述................................................ ........................... 26
RAM段寄存器............................................... ............. 26
第0版|第60页2
RAM状态机............................................... .................... 26
RAM触发器（ RT ）引脚............................................ ................... 26
加载/读取RAM运行............................................. ... 27
RAM播放操作............................................... .......... 27
RAM播放模式概述......................................... 28
RAM斜坡模式............................................. .............. 28
RAM双向斜坡模式.......................................... 29
RAM连续双向斜坡模式.................... 31
RAM连续再循环模式................................... 32
时钟输入（ REF_CLK ） ............................................. ................... 33
REFCLK概述................................................ ..................... 33
晶振驱动REF_CLK ............................................... .......... 33
直接驱动REF_CLK ............................................... ............ 33
锁相环（ PLL ）乘法器...................................... 34
PLL电荷泵............................................... ....................... 35
外部PLL环路滤波器元件................................... 35
PLL锁定指示............................................... ................... 35
附加功能................................................ ........................ 36
输出移位键控（ OSK ） ............................................ ........... 36
手动OSK ................................................ ............................ 36
自动OSK ................................................ ....................... 36
配置文件................................................. ........................................ 37
I / O_UPDATE引脚.............................................. ........................ 37
自动I / O更新............................................. .................. 37
断电控制.............................................. .................. 38
通用I / O（ GPIO ）端口........................................ .. 38
多设备同步........................................... 39
串行编程................................................ ....................... 42
控制接口，串行I / O ........................................... ........ 42
通用串行I / O操作............................................ ....... 42
指令字节................................................ .......................... 42
指令字节信息位图................................ 42
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