F2255 datasheet(17/27 Pages) RENESAS

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Voltage Variable RF Attenuator

1MHz to 3000MHz

May 7, 2021

F2255

Datasheet

PIN DESCRIPTION

Name

Function

1, 7, 12

GND

Ground these pins as close to the device as possible.

2, 4, 9, 11, 13

No internal connection. Renesas recommends connecting these

pins to GND.

RF1

RF Port 1. Matched to 50 ohms. Must use an external AC

coupling capacitor as close to the device as possible. For low

frequency operation increase the capacitor value to result in a

low reactance at the frequency of interest.

5, 6, 8

RTN

Attenuator Ground Return. Each of these pins require a capacitor

to GND to provide an RF return path. Place the capacitor as

close to the device as possible.

RF2

RF Port 2. Matched to 50 ohms. Must use an external AC

coupling capacitor as close to the device as possible. For low

frequency operation increase the capacitor value to result in a

low reactance at the frequency of interest.

VCTRL

Attenuator control voltage. Apply a voltage in the range as

specified in the Operating Conditions Table. See application

section for details about VCTRL.

VDD

Power supply input. Bypass to GND with capacitors close as

possible to pin.

VMODE

Attenuator slope control. Set to logic LOW to enable negative

attenuation slope. Set to logic HIGH to enable positive

attenuation slope.

— EP

Exposed Pad. Internally connected to GND. Solder this exposed

pad to a PCB pad that uses multiple ground vias to achieve the

specified RF performance.

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