the bandwith wrong with adrv9002

Question

Hi 
 I'm using zcu102+adrv9002 platform, generated a profile with 30.72Msps sampling rate and 15.36MHz bandwidth. Under this configuration, the max frequency of cw tone should not over &plusmn;7.68MHz,but actually the cw tone can up to &plusmn;15.36MHz, it seems wrong. 
 
 when I trying to send an 9.36MHz bandwidth ofdm signal with dac_data_in mode, the acutally bandwith is also 18.72MHz.

the relationship between dac_data_in and dac1_clk/dac1_valid are below. sampling one data when dac1_valid high. 
 
 Is there any mistake of my configuration? 
 Thanks

mozhoudonglu · Accepted Answer

Hi 
 I thought the sample rate equals to dac1_clk, but actually the dac1_clk is twice the sample rate. So if my baseband signal is 10MHz, my sample rate should be setted 15.36Msps and bandwith set 10MHz rather than 30.72Msps sample rate, 15.36MHz bandwidth. Which lead to this mistake 
 
 Thanks)

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the bandwith wrong with adrv9002