Data Sheet

ADRF5532

APPLICATIONS INFORMATION

analog.com

Rev. A | 10 of 11

The ADRF5532 has a single power-supply pin (VCC) and one

control pin (T/R). Figure 17 shows the external components and

connections for supply and control pins. The VCC pin is decoupled

with a 100 pF multilayer ceramic capacitor and a 4.7 μF capacitor.

The T/R pin is decoupled with a 100 pF multilayer ceramic capac-

itor. The device pinout allows the placement of the decoupling

capacitors close to the device. The RF pins (ANT, TERM, RXOUT)

do not require external DC blocking capacitors; all pins are pulled

down to 0 V DC with high impedance. See Table 5 for details.

Figure 17. Recommended Schematic

RECOMMENDATIONS FOR PRINTED CIRCUIT

BOARD DESIGN

The RF ports are matched to 50 Ω internally and the pin-out is

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

teristic impedance on the PCB. Figure 18 shows the referenced

CPWG RF trace design for an RF substrate with 10 mil thick

Rogers RO4350 dielectric material. RF trace with 18 mil width

and 13 mil clearance is recommended for 2.7 mil finished copper

thickness.

Figure 18. Example PCB Stack-Up

Figure 19 shows the routing of the RF traces, supply, and control

signals from the device. 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 device is the bottom

side.

Figure 19. PCB Routings

Figure 20 shows the recommended layout from the device RF pins

to the 50 Ω CPWG on the referenced stack-up. 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 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.

Figure 20. Recommended RF Pin Transitions

For further recommendations on alternate PCB stack-ups with

different dielectric thickness and CPWG design, contact Analog

Devices Technical Support.