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why the time between enter TX mode and the RF signal output so long?

Question asked by little_fish@rf on Jan 26, 2018
Latest reply on Feb 3, 2018 by little_fish@rf

Dear sir,

         When TXNRX=1, followed ENABLE=1, I measure the time between ENABLE=1 and the actually RF signal output, the time is about 18us, why so long?

The BBPLL is 1024M, the TX RX digital filter setting 0x02 is 0x5c, 0x03 is 0x5c, bypass TX/RX FIR both, the TX/RX FIR filter block is 32M;

Using the signal from BIST 1MHz and PRBS to test is the same time.

Is these time correct? If I want to reduce the time? What should I do?

 

attachment is the scope picture, the yellow trace is ENABLE pin and the purple trace is the RF output.

AD9361_ENABLE为1到TX射频信号出来的时间

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