RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS150211

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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RFFM4551

Pin Names and Descriptions

Pin

Name

Description

1

GND

Ground connection

2

RX

RF output port for the 802.11a/n/ac LNA. This port is

matched to 50Ω and DC block is provided internally.

3

GND

Ground connection

4

VDD

Supply voltage for the LNA and PA regulator. See applications schematic for biasing and bypassing

components.

5

PDET

Power detector voltage for the TX path. May need external series R/shunt C to adjust voltage level and to

filter RF noise.

6

PA_EN

Control voltage for the PA and TX switch. See truth table for proper settings.

7

NC

No Connect. This pin is not connected internally and can be left floating or connected to ground.

8

TX

RF input port for the 802.11a/n PA. Input is

matched to 50Ω and DC block is provided internally.

9

NC

No Connect. This pin is not connected internally and can be left floating or connected to ground.

10

VCC

Supply voltage for the PA. See applications schematic for biasing and bypassing components.

11

VCC

Supply voltage for the PA. See applications schematic for biasing and bypassing components.

12

GND

Ground connection

13

ANT

RF bidirectional antenna port matched to 50Ω and DC block is provided internally.

14

GND

Ground connection

15

CRX

Receive switch control pin. See truth table

16

LNA_EN

Control voltage for the LNA. When this pin is set to a low logic state, the bypass mode is enabled.

PKG BASE

GND

Ground connection. The backside of the package should be connected to the ground plane through a short

path, i.e., PCB vias under the device are recommended.