AD9866 PGA & SPI setting

Hello.

 

I'll ask about Tx  setting of AD9866.

In datasheet P20 Resister Map.

・MODE:1(Full-Duplex) ・CONFIG:0

0x09 :Default setting is for hardware Rx gain code via PGA or Tx data port.

0x0A :Default setting is for Tx gain code via SPI control.

That resisters supposed to control by single way.?

So I used default setting AD9866. But Tx read-back  resistor data is not correct.

I saw that PGA[5] bit was written to Tx gain code.

 

Can you advice me to solve problem?

What should I check ?

 

best regards.

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