Data Sheet

ADRF5301

APPLICATIONS INFORMATION

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Rev. 0 | 9 of 10

The ADRF5301 has one power supply pin (VDD) and one con-

trol pin (CTRL). Figure 14 shows the external components and

connections for the supply pin. The VDD pin is decoupled with

a 100pF multilayer ceramic capacitor. The device pin-out allows

the placement of the decoupling capacitors close to the device.

No other external components are needed for bias and operation,

except DC blocking capacitors on the RF pins when the RF lines

are biased at a voltage different than 0 V. See the Pin Configuration

and Function Descriptions section for details.

Figure 14. Recommended Schematic

RECOMMENDATIONS FOR PRINTED CIRCUIT

BOARD DESIGN

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

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

teristic impedance on the PCB. Figure 15 shows the referenced

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

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

clearance is recommended for 2.2 mil finished copper thickness.

Figure 15. Example PCB Stack-Up

Figure 16 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 16. PCB Routings

Figure 17 shows the recommended layout from the device RF pins

to the 50 Ω CPWG on the referenced stack-up. PCB pads are

drawn 1:1 to device pads. The ground pads are drawn soldermask

defined and the signal pads are drawn as pad defined. The RF

trace from the PCB pad is extended with the same width by 2 mils

and tapered to 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 17. Recommended RF Pin Transitions

For alternate PCB stack-ups with different dielectric thickness and

CPWG design, contact Analog Devices, Inc., Technical Support

Request for further recommendations.