Problem about output pin of ADF4351

[torbai]

I am reading the datasheet of ADF4351, and I have a question about its output pins.

The output pins are differential, and I desire a broadband output matching. The recommended method in datasheet(page 27) is using a 50 \[\Omega\] resistor connected between pin RF_OUT and power supply. But there are two output pins: RF_OUTA+ and RF_OUTA-. How should I add the 50 \[\Omega\] resistor? Should I use a balun? or just using only one of those pins would be fine?

 

[mscx]

hi, you can find details in the datasheet or the reference circuits.

 

[mtwieg]

Depends how much output power you require from it. If you want to maximize output power and also need wide bandwidth, you'll want to use a transformer balun, with the center tap of the transformer connected to Vvco. Keep in mind that the S22 of this will be poor, despite getting more output power.