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SDO Circuit of AD9239

Question asked by YuichiMASUDA on Mar 12, 2015
Latest reply on Mar 17, 2015 by J.Harris

Hi,

 

I have a question for internal circuit of AD9239 SDO pin.

 

When bit7 of Addr 0x00 is cleared, SDO pin should go inactive.

In the SDO inactive situation, I think that the 345 ohm pull down register ( in Figure.44) is disconnected from the SDO pin,

Is this correct?

 

Also why 345 ohm register should be there?

I think the register is heavy load as a logic circuit...

 

BR,

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