Data Sheet ADRF5045
Rev. 0 | Page 11 of 14
APPLICATIONS INFORMATION
EVALUATION BOARD
Figure 22 shows the top view of the ADRF5045-EVA L Z , and
Figure 23 shows the cross sectional view of the ADRF5045-
EVA L Z .
Figure 22. Evaluation Board Layout, Top View
RO4003
0.5oz Cu (0.7mil)
0.5oz Cu (0.7mil)
0.5oz Cu (0.7mil)
0.5oz Cu (0.7mil)
0.5oz Cu (0.7mil)
0.5 oz Cu (0.7mil)
W = 14mil
G = 5mil
T = 0.7mil
H = 8mil
TOTAL THICKNESS ≈ 62mil
16314-022
Figure 23. Evaluation Board (Cross Sectional View)
The ADRF5045-EVA L Z is a 4-layer evaluation board. Each
copper layer is 0.7 mil (0.5 oz) and separated by dielectric
materials. All RF and dc traces are routed on the top copper
layer, and the inner and bottom layers are grounded planes that
provide a solid ground for the RF transmission lines. The top
dielectric material is 8 mil Rogers RO4003, offering optimal
high frequency performance. The middle and bottom dielectric
materials provide mechanical strength. The overall board
thickness is 62 mil, which allows 2.4 mm RF launchers to be
connected at the board edges.
The RF transmission lines were designed using a coplanar
waveguide (CPWG) model, with a trace width of 14 mil and a
ground clearance of 5 mil, to have a characteristic impedance of
50 Ω. For optimal RF and thermal grounding, as many plated
through vias as possible are arranged around transmission lines
and under the exposed pad of the package.
Figure 24 shows the actual ADRF5045-EVA L Z with component
placement. Two power supply ports are connected to the VDD
and VSS test points (TP1 and TP4), control voltages are connected
to the V1 and V2 test points (TP2 and TP3), and the ground
reference is connected to the GND test point (TP5).
Figure 24. Evaluation Board Component Placement
On the control traces (V1 and V2), a 0 Ω resistor connects the
test points to the pins on the ADRF5045. On the supply traces
(VDD and VSS), a 100 pF bypass capacitor filters high frequency
noise. Additionally, unpopulated components positions are
available for applying extra bypass capacitors.
The RF input and output ports (RFC, RF1, RF2, RF3, and RF4)
are connected through 50 Ω transmission lines to the 2.4 mm
RF launchers (J1 to J5). These high frequency RF launchers are
by contact and not soldered onto the board. A thru calibration
line connects the unpopulated J6 and J7 launchers; this
transmission line is used to estimate the loss of the PCB
over the environmental conditions being evaluated.
The schematic of the ADRF5045-EVA L Z is shown in Figure 25.
