Data Sheet

ADRF5345

APPLICATION INFORMATION

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Rev. 0 | 10 of 11

Connect the RF ports of the ADRF5345 to transmission lines with

a characteristic impedance of 50 Ω. The package ground leads and

the backside ground slug must connect directly to the ground plane.

The ADRF5345 has one power supply pin (VDD) and three control

pins (V1, V2, and LS). The supply pin must be decoupled with

100 pF and 4.7 μF capacitors, while the control pins must be

decoupled with 100 pF capacitors.

Figure 23. Recommended Schematic

A typical application of ADRF5345 is a 4 step phase shifter that is

achieved by connecting the SP4T switches back to back. Each RF

arm must have a different delay line (see Figure 24).

The switch control inputs, V1 and V2, can be connected together

to configure the back to back phase shifter, which is achieved

by applying inverted logic to LS pin of SW1 and SW2. The LS

pins do not require additional routing due to the internal pull-up.

Therefore, the LS pin of ADRF5345 can be directly grounded or

only decoupled with a capacitor.

Figure 24. Back to Back Configuration Schematic