Data Sheet

ADRF5420

APPLICATIONS INFORMATION

analog.com

Rev. 0 | 12 of 14

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 18 shows the referenced

CPWG design for a 150µm thick Megtron6 2×1080 R‑5775G dielec-

tric material. The RF trace with 300µm width and 300µm gap is

used for 42µm finished copper thickness.

Figure 18. Probe Board Stackup

Figure 19. Recommended RF Pin Transitions

Figure 19 shows the recommended layout from the device RF

pins to the 50Ω CPWG. Signal pads have a 170µm diameter

extended with a neck for broadband tuning and tapered to RF trace

with a 45° angle. The optimized RF pin transitions for broadband

performance is given for different stackups in Table 8. For further

recomenndations on alternate PCB stackups with different dielectric

thickness and CPWG design, contact Analog Devices, Inc., Analog

Devices Support.

Table 8. Recommended RFx Pin Transitions for Different Stackups

RF Stackup Height and Dielectric

RF Trace Dimensions

ADRF5420

Mnemonics

Transition Dimensions

H (µm)

Er

W (µm)

G (µm)

N (µm)

L (µm)

85

3.02

180

250

RFC

100

190

RF1, RF2

100

215

100

3.34

200

225

RFC

120

190

RF1, RF2

120

165

115

3.40

225

250

RFC

120

140

RF1, RF2

120

165

125

3.00

250

225

RFC

120

90

RF1, RF2

120

165

1501

3.40

300

300

RFC

120

90

RF1, RF2

120

165

175

3.16

360

245

RFC

120

90

RF1, RF2

120

165

190

3.00

425

225

RFC

170

90

RF1, RF2

170

165

200

3.55

425

275

RFC

170

90

RF1, RF2

170

165

1 Design reference and generic footprint.