How to set LTC5586 ADRF6520 AD9691 Common mode voltages ?

Dear Sir,
Our application is Zero-IF.
But AD9691 provide common mode voltage 0.85V.
I have some questions as below:
  1. What the common mode voltage for ac-coupled of ADRF6520?
  2. May I use  AC-coupled connection from LTC5586 to ADRF6520 and from ADRF6520 to AD9691?
  3. If I need AC-coupled connection from LTC5586 to ADRF6520 and from ADRF6520 to AD9691.Could you please send me a reference interface connection?
Parents
  • +1
    •  Analog Employees 
    on Mar 30, 2020 4:35 PM 11 months ago

    For the ADRF6520, the input common-mode is set at 1.375V and the output common-mode set at 1.65V.  This is whether the output is DC or AC-coupled.  There is no mechanism to change these common-mode voltages on the ADRF6520. 

    I would recommend using large valued AC coupling capacitors on the ADRF6520 on its input and output if the stages that are connected cannot accommodate its common-mode voltage.  Be sure to size the capacitors values such that the high-pass corner they create is not an appreciable percentage of your signal bandwidth.   

Reply
  • +1
    •  Analog Employees 
    on Mar 30, 2020 4:35 PM 11 months ago

    For the ADRF6520, the input common-mode is set at 1.375V and the output common-mode set at 1.65V.  This is whether the output is DC or AC-coupled.  There is no mechanism to change these common-mode voltages on the ADRF6520. 

    I would recommend using large valued AC coupling capacitors on the ADRF6520 on its input and output if the stages that are connected cannot accommodate its common-mode voltage.  Be sure to size the capacitors values such that the high-pass corner they create is not an appreciable percentage of your signal bandwidth.   

Children
No Data