RF2681PCBA Ver la hoja de datos (PDF) - RF Micro Devices

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RF2681PCBA

W-CDMA LINEAR VARIABLE GAIN DRIVER AMPLIFIER

RF Micro Devices 

Preliminary

RF2681

Pin Function Description

Interface Schematic

1

VCC1

DC supply for internal bias circuitry. This pin should be tied to VCC, and

must be bypassed with an RF capacitor. The trace length between the

pin and the bypass capacitor should be minimized. The ground side of

the capacitor should connect immediately to the ground plane.

2

VREG

DC supply for internal bias circuitry. This pin should be tied to a 2.7V

supply for proper operation. Increasing this voltage above 2.7V will

result in increased current drain and is not recommended.

3

VCC2

Same as pin 1.

4

PD

Power down pin. This pin should be brought below 1V for proper opera-

tion. The device is turned off when the voltage on this pin increases

above 2V.

5

NC

This pin is not internally connected, but should be grounded, if possi-

ble, to improve RF isolation. Please refer to the evaluation board layout.

4

6

RF IN

RF input pin. This pin requires external matching components, and is

DC-coupled. Please refer to the applications schematic for recom-

mended matching components.

7

GND

Ground

8

GND

Ground

9

GND

Ground

10

RF OUT RF output pin. This pin requires an external matching network. VCC is

provided through an inductor of that network. Please refer to the appli-

cations schematic for recommended matching components.

11

NC

Same as pin 5.

12

GC

Gain control pin. This pin allows the gain of the amplifier to be varied in

a continuous “analog” fashion. With an applied voltage of 0.2V or less,

the amplifier exhibits the minimum gain. In the region between 0.2V

and 2.25V, the amplifier gain in dB depends on the voltage in a roughly

linear manner. Above 2.25V, the amplifier gain is set for maximum.

Pkg

Gnd

GND

Ground connection for the device “die flag”. The backside of the pack-

age should be soldered to a top side ground pad which is connected to

the PC board ground plane through multiple vias.

Rev A1 010824

4-45

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