I'm using the AD9552 to generate a 480M clock out, through the spi mode, the XTAL pins are float, a 20M REF clock is used, the A[2:0],Y[5:0] are keep high, and the RESET pin is kept low,the OUT clock is 625M,I don't know why.(LOCKED PIN is high)
the REGISTERs I set are as follows:(N=192,P1=2,P2=4)
in addition,I want know how the A[2:0] and Y[5:0] should be set before and after the SPI communication
thans a lot !