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AD9866 PGA & SPI setting

Question asked by Osamu on Feb 25, 2015
Latest reply on Feb 25, 2015 by Osamu

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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