ADF7021BCPZ-RL Test DAC Method

Question

Hello experts, 
 I want to use the Test DAC feature on ADF7021BCPZ-RL. I followed the instructions on AN-852 Application Notes and referred to ADF7021 data sheet stating that "The output can be viewed on the SWD pin. This signal, when filtered appropriately, can then be used to do ... etc" 
 I haven't succeeded so far, please help. 
 Appreciate your help so much, best regards, 
 Bud_Nug

dvalles · Accepted Answer

Hi Bud_Nug & team, 
 Sorry for the late reply. 
 The documents related to the ADF7021 can be found on this link: ADF7021-N Datasheet and Product Info | Analog Devices , which you already have. 
 The register values (specifically Reg14) you provided is enough to produce an output on the SWD pin, however, the raw data is not enough to get the eye diagram. 
 From ADF7021DBXEvalNote (Test DAC Output page 9), the RC filter is necessary to properly use the output of the SWD pin. You can design an RC (easier to use LPF) filter that will fit your application's data rate, you can also try to change the component values of the given RC filter connections using software that is available to you. 
 
 Regards, 
 dvalles

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