Now, I'm learning to use the DDS chip AD9911, I have following questions. Your replies will be appreciated.
1.How should I deal with unused input and output pins, tie all unused pins to either ground ("pulldown") or the positive supply voltage ("pullup") via resistors, or tie unused pins to AGND via CAPs. And what's the difference?
2. According to the datasheet, CLK_MODE_SEL (Pin 24) is an analog input, Is is right to tie this pin to AGND in order to bypass the oscillator.