Data Sheet

ADRF5045

Rev. A | Page 11 of 14

APPLICATIONS INFORMATION

EVALUATION BOARD

Figure 22 shows the top view of the ADRF5045-EVALZ, and

Figure 23 shows the cross sectional view of the ADRF5045-

EVALZ.

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

Figure 23. Evaluation Board (Cross Sectional View)

The ADRF5045-EVALZ 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-EVALZ 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-EVALZ is shown in Figure 25.