3 of 10

RF2048

Rev A13 DS070403

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Package Drawing

Pin

Function

Description

Interface Schematic

1RF 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 most applica-

tions. DC-coupling of the input is not allowed, because this will override the

internal feedback loop and cause temperature instability.

2GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

3RF OUT

RF output and bias pin. Biasing is accomplished with an external series

resistor and choke inductor to V

current into this pin to a desired level. The resistor value is determined by

the following equation:

Care should also be taken in the resistor selection to ensure that the cur-

rent into the part never exceeds 40mA over the planned operating temper-

ature. This means that a resistor between the supply and this pin is always

required, even if a supply near 3.6V is available, to provide DC feedback to

prevent thermal runaway. Because DC is present on this pin, a DC-blocking

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

applications. The supply side of the bias network should also be well

bypassed.

4GND

Same as pin 2.

R

V

SUPPLY

V

DEVICE

–

()

I

CC

-------------------------------------------------------

=

RF OUT

RF IN

NOTES:

1. Shaded lead is pin 1.

2. Darkened areas are metallization.

3. Dimension applies to ceramic lid minus epoxy coating.

0.070

sq.

45° ± 1°

0.068

± 0.002

0.052

0.041

0.025

± 0.002

3

0.005

± 0.002

0.015

+0.002

-0.001

0.020

± 0.002

0.040

± 0.002

0.200 Sq.

Typ.