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adl5380 adrf6518 ad9684 dc coupled common mode issue

Question asked by ahmet783 on Aug 4, 2016
Latest reply on Aug 5, 2016 by jdobler

Hello everyone

I have tried to design low IF recceiver with adl 5380 demod, adrf6518 if vga and ad9684 adc.

in this link you can see block diagram of different version (ADC is different) ad9680 and adrf6518 Integration

How can I set common mode voltage

adrf6518 input and output common mode voltage 1.5 Vpp (for best performance)

ad9684 input common mode voltage is 2.05 V

in adl5380 datasheet there is a table(Table 4. ADJ Pin Resistor Values and Approximate ADJ Pin Voltages) and for this table common mode we choose is between 2.2 V and 3.8 V

What is the best solution to combine this three component with dc coupled line .

Thanks in advance

 

Ahmet

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