Evaluation Board Hardware; Overview; Board Layout; Power Supply And Control Inputs - Analog Devices EVAL-ADRF5347 User Manual

User Guide

EVALUATION BOARD HARDWARE

OVERVIEW

The ADRF5347-EVALZ is a connectorized board, assembled with
the ADRF5347 and its application circuitry. All components are
placed on the primary side of ADRF5347-EVALZ.
an assembly drawing for the ADRF5347-EVALZ and
shows an evaluation board schematic.

BOARD LAYOUT

The ADRF5347-EVALZ is designed using RF circuit design techni-
ques on an 8-layer printed circuit board (PCB).
PCB stack-up.
Figure 2. Evaluation Board Stack-Up
The outer copper layers are 2 oz (2.7 mil) thick and the inner layers
are 1 oz (1.3 mil) thick.
The top dielectric material is 10 mil Rogers 4350B, which provides
50 Ω controlled impedance and optimizes the high frequency per-
formance. All RF traces are routed on the top layer, and the second
layer is used as the ground plane for RF transmission lines. The
remaining six layers are also ground planes filled with FR4 material
to manage the thermal rise during high power operations, and
are supported with dense and filled vias to the PCB bottom for
thermal relief. The overall board thickness is approximately 63 mil
for mechanical strength.
analog.com
The RF transmission lines are designed using a coplanar wave-
guide (CPWG) model with a width of 18 mil and ground spacing
of 13 mil to have a characteristic impedance of 50 Ω. Ground via
fences are arranged on both sides of a coplanar waveguide to
Figure 10 shows
improve isolation between nearby RF lines and other signal lines.
Figure 9
The exposed ground pad of the ADRF5347, which is soldered
on the PCB ground pad, is the main thermal conduit for heat
dissipation. The PCB ground pad is densely populated with filled,
through vias to provide the lowest possible thermal resistance path
from the top to the bottom of the PCB. The connections from the
Figure 2 shows the
package ground leads to ground are kept as short as possible.

POWER SUPPLY AND CONTROL INPUTS

The ADRF5347-EVALZ requires two power supply inputs, three
control inputs, and a ground, as shown in
points are populated on V
supply is connected to the DC test point V
is connected to the DC test point on V
be connected to GND. Connect the control inputs, V1, V2, and
LS to 3.3 V or 0 V. The typical total current consumption for the
ADRF5347 is 2.4 mA from V
power dissipation of 13.36 mW.
The V
and 4.7 μF capacitors, and the control pins of the ADRF5347 are
decoupled with a 100 pF capacitor.
Table 1. Power Supply and Control Inputs
Test Points
VDD
VSS
V1
V2
LS
GND
EVAL-ADRF5347
, V , V1, V2, LS, and GND. 5 V
DD SS
and 0.4mA from V
DD
supply pin of the ADRF5347 is decoupled with 100 pF
DD
Description
Positive supply voltage
Negative supply voltage
Control input 1
Control input 2
Logic select
Ground
Table 1. The DC test
and −3.4 V supply
DD
. Ground reference can
SS
, with typical
SS
Rev. 0 | 3 of 8