RF2312 Ver la hoja de datos (PDF) - RF Micro Devices

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RF2312

LINEAR GENERAL PURPOSE AMPLIFIER

RF Micro Devices 

RF2312

Pin Function Description

Interface Schematic

1

RF IN

RF input pin. This pin is NOT internally DC-blocked. A DC-blocking

capacitor, suitable for the frequency of operation, should be used in all

applications. The device has internal feedback, and not using a DC-

blocking capacitor will disable the temperature compensation.The bias

of the device can be controlled by this pin. Adding an optional 1kΩ

resistor to ground on this pin reduces the bias level, which may be com-

pensated for by a higher supply voltage to maintain the appropriate

bias level. The net effect of this is an increased output power capability,

as well as higher linearity for signals with high crest factors. DC-cou-

pling of the input is not allowed, because this will override the internal

feedback loop and cause temperature instability.

2

GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane. Each ground pin should

have a via to the ground plane.

3

GND

Same as pin 2.

4

GND

Same as pin 2.

5

GND

Same as pin 2.

6

GND

Same as pin 2.

7

GND

Same as pin 2.

8

RF OUT RF output and bias pin. Because DC is present on this pin, a DC-block-

ing capacitor, suitable for the frequency of operation, should be used in

most applications. For biasing, an RF choke in series with a resistor is

needed. The value for the resistor RC is 30Ω (0.5W) for VCC=9V and

21Ω for VCC=8V. The DC voltage on this pin is typically 6.0V with a

RF IN

current of 100mA. In lower power applications the value of RC can be

increased to lower the current and VD on this pin.

RF OUT

Rev C6 051025

3-5

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