Hello，I hope to use a AD9914 for linearly sweep, the system clock is 2.5GHz.
The sweep frequency generated is 200MHz -- 300MHz, and the frequency step is 1MHz, Step intervals is 37.5ns,
I use No-Dwell high configuration, so it can sweep all the time automatic .
Here is my register configuration:
Digital Ramp Lower Limit=0x147A1E47(register address is 0x04,200MHz)
Digital Ramp Upper Limit=0x1EB851EB(register address is 0x05,300MHz)
Rising Digital Ramp stope=0x001A36E3(register address is 0x06,1MHz)
Falling Digital Ramp stope=0x001A36E3(register address is 0x07,1MHz)
Digital Ramp Rate Register=0x00040004(register address is 0x08,37.5ns)
But finally, It just a constant 90MHz output， then I measured the pin 65 ( DROVER) , it is high ..
So what happend to my AD9914, I just hope to use it to realize linearly sweep or Where did I go wrong for my configuration or connection.. thank you !