AD9901

Hi Khanniazi ,

Moved to   RF & Microwave , it looks like this is where this part is supported.

In the meantime, can you provide some details on how you're planning on using the part?

I want to use it to phase lock the two function generators in our project lab. I will apply two 10MHz signals from both generators and then use ad9901 output to a microcontroller atmega8. When the two generators will be out of phase, it will generate an error signal on the basis of which i will try to phase lock these function generators. But i need information like lock detect to feed my controller whether signals are phase locked or not. Does ad9901 provide this information?

Figure 4 in the datasheet shows the expected output at lock, which is a 50% duty cycle square wave. In general a lock indicator is somewhat arbitrary, you'd filter the output of the phase detector, then set a window around 50% of the logic level, within which you'd say that the signals are locked.

But taking a step back - what is the model number of the function generators? Many have a 10 MHz reference input, so locking two (or more) generators is easy, just provide the same 10 MHz reference to all generators. 

-Mark