Hey,

I have some more questions about the AD9958...

On my Output Signal I need a Peak to peak Voltage that is variable for example one time i need 5V next time 15V, so I have to change the scale factor for the AM? But how do i calculate the scale factor…

Hey there,

I´m looking for a 2 channel dds chip such as the ad9958, but i have some questions.

Is it possible to generate a difference between the two clock frequencies of both channels, for exapmle by using the internal clock reference and the external…

AD9958有两路输出，能否让其两路输出分别输出I信号和Q信号。在程序中怎么来实现？

Hey guys,

I have one last question about the AD9958, did i get it right that modulation of amplitude, phase or frequency is done by FSK,PSK,ASK?

So there´s no possibility of using analog modulation such as PM,AM,FM?

Thanks in regards,

greenhorn.

前段时间做了一个关于AD9958的板子，输出频率在14MHz到22MHz，从其PDF资料上的相位噪声曲线看，15MHz在10KHz以内的杂散非常好，而实际上做出来近端几百Hz的杂散最差的只有80左右的杂散抑制，请问，杂散抑制只能做到这个程度还是我哪个地方没有做好？杂散的位置随着频率的不同而不同，比如在18.185MHz处的杂散主要是250HZ，500Hz；而在18.818MHz处的杂散有30Hz，85Hz和110Hz及其N次谐波的杂散。时钟采用400MHz，对时钟的实现是100MHz晶振通过放大器饱和区取出4次谐波…

AD9958的两个输出端是否需要上拉？

现在做AD9958呢 ，写寄存器好多啊，谁有评估板的软件啊，给一个吧！谢谢！