ADF5355 datasheet(37/38 Pages) AD

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Data Sheet

ADF5355

OUTPUT MATCHING

The low frequency output can simply be ac-coupled to the next

circuit, if desired; however, if higher output power is required,

use a pull-up inductor to increase the output power level.

Figure 56. Optimum Output Stage

When differential outputs are not needed, terminate the unused

output or combine it with both outputs using a balun.

For lower frequencies below 2 GHz, it is recommended to use a

100 nH inductor on the RFOUTA+/RFOUTA− pins.

The RFOUTA+/RFOUTA− pins are a differential circuit. Provide

each output with the same (or similar) components where

possible, such as same shunt inductor value, bypass capacitor,

and termination.

AC couple the higher frequency output, RFOUTB, directly to the

next appropriate circuit stage.

RFOUTB is matched internally to a 50 Ω impedance and requires

no additional matching components.

7.5nH

100pF

RFOUTA+

VRF

50Ω

Rev. A | Page 37 of 38

ADF5355 bảng dữ liệu(PDF) 37 Page - Analog Devices