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Question of EVB-AD6655 NCO FREQ Setting

On the Reg Map, ADDR 0x11E ~ 0x121 are NCO Frequency Value [32: 0].
On the SPI control GUI side, NCO FREQ and Samp Freq are shown.

1) Can Samp Freq input the input frequency value of AD6655 clk +/- (pins 49 and 50)?

2) If a clock of 96MHz is input to the clk +/- (pins 49 and 50) of the AD6655, does 48Msps of data output in terms of actual I / Q data?
(Datasheet Figure 5 Decimated IQ Mode CMOS Data and Fast Detect Output Timing)

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