RF2381PCBA datasheet(4/8 Pages) RFMD

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4-46

RF2381

Rev A1 010511

Application Schematic

1850MHz to 1910MHz

Function

Description

Interface Schematic

1RF OUT

RF output pin. This pin is DC-coupled and requires VCC throughabias

inductor sized accordingly to provide a high pass transformation with a

series capacitor.

2GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

3GC

Analog gain control pin. This pin controls the gain of the IC. Minimum

gain occurs at VGC<0.4V and maximum gain is achieved with

VGC=2.0V. 50dB of linear gain control with little variation of input P1dB

is available.

4RF IN

RF input pin. This pin is DC-coupled.

5GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

6VCC

Power supply. This pin should be connected to a regulated supply and

requires a series inductor and bypass capacitor. Voltage is supplied

through this pin to the first stage collector; this voltage also controls the

bias. Gain may be tuned by adjusting the value of the feed inductor.

RF IN

Note orientation of

package in this schematic.

1pF

2.7 nH

33 nF

VCC

RF OUT

2.7 nH*

33 nF

VCC

ATT

100 pF

33 pF

*For W-CDMA, use 2.2 nH

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