RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS131016

For sales or technical support, contact RFMD at +1.336.678.5570 or customerservice@rfmd.com.

The information in this publication is believed to be accurate. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents or other rights of

third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended

application circuitry and specifications at any time without prior notice.

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NLB-400

Pin Names and Descriptions

Pin

Name

Description

Interface Schematic

1

RFIN

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 applications. DC coupling 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.

3

RFOUT

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

to set the DC 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 current into the part never exceeds maximum datasheet

operating current over the planned operating temperature. This

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

required, even if a supply near 5.0V 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.

4

GND

Same as pin 2.

Package Drawing