Data Sheet

ADRF5060

APPLICATIONS INFORMATION

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Rev. 0 | 14 of 16

Transfer Switch

In the configuration shown in Figure 29, two ADRF5060 devices

are positioned to create a transfer switch circuit. This circuit allows

users to switch between configurations as shown in the signal path

(see Figure 30) when the digital control pin is toggled between high

and low (see Table 8).

Figure 29. Transfer Switch Application Block Diagram

Figure 30. Transfer Switch Signal Path

Table 8. Transfer Switch Application Truth Table

CTRL1

Switch State2

Low

Through paths selected: RF4 to RF2 and RF1 to RF3

High

Adjacent (ADJ) paths selected: RF4 to RF1 and RF2 to RF3

1 CTRL refers to the digital control pin (V2).

2 RF1, RF2, RF3, and RF4 are defined in Figure 29 .

RECOMMENDATIONS FOR PCB DESIGN

The RF ports are matched to 50Ω internally, and the pinout is

designed to mate a coplanar waveguide (CPWG) with 50Ω charac-

teristic impedance on the PCB. Figure 31 shows the referenced

CPWG RF trace design for an RF substrate with 8mil thick Rogers

RO4003 dielectric material. RF trace with 14mil width and 7mil

clearance is recommended for 1.5mil finished copper thickness.

Figure 31. Example PCB Stack-Up

Figure 32 shows the routing of the RF traces, supply, and control

signals from the ADRF5060. The ground planes are connected with

as many filled, through vias as allowed for optimal RF and thermal

performance. The primary thermal path for the ADRF5060 is the

bottom side.

Figure 32. PCB Routings

Figure 33 shows the recommended layout from the device RF pins

(RFIN, RFOUT, OUTA, OUTB, INA, and INB) to the 50Ω CPWG

on the referenced stack-up. The PCB pads are drawn 1:1 to the

device pads. The ground pads are drawn solder mask defined, and

the signal pads are drawn as pad defined. The RF trace from the

PCB pad is extended with the same width till the package edge

and tapered to the RF trace with a 45° angle. The paste mask is

also designed to match the pad without any aperture reduction. The

paste is divided into multiple openings for the paddle.