I'm build a synthesizer (up to 2GHz) and got a questions regarding the gound planes (analog vs. digital).
According to the datasheet (p. 7) some pins must be connected to analog GND, ex. pin 10 must be connected to the analog GND plane.
I read somewhere that it is best to have separate ground planes, connected at a single point. But somewhere else I read that it is best to have one gnd plane, and just be carefully with the the placement of analog and digital blocks.
But what is the best pcb layout design?