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AD9434 Analog Input Issues

Question asked by Q-on on Jan 20, 2014
Latest reply on Jan 21, 2014 by TonyM

Hi,

we actually have started a design with the AD9434, but i'm a littel confused about some points in the datasheet:

 

Figure 43 shows a AD9434 with an AC-coupled input  with two 200Ohm resistors feeding CML Voltage to the analog inputs on the AD9434.

In Figure 34 I could see  two internal 500 resistors doing the same.

My question is: In which cases do I need external resistors to feed the CML voltage to the analog inputs.

Also I did not find the the SPI-regsiter to control the function indicated in Figure 34.

 

Best regards

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