RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS130930

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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RFFM8205

Switch Control Logic Truth Table

Operating Mode

PA_EN

LNA_EN

C_RX

C_BT

Standby

Low

Low

Low

Low

802.11b/g/n/ac TX High Power

High

Low

Low

Low

802.11b/g/n/ac RX Gain

Low

High

High

Low

802.11b/g/n/ac RX Bypass

Low

Low

High

Low

BT RX/TX

Low

Low

Low

High

Notes:

•

PA_EN and TX switch control are tied together internally.

•

Timing Diagram

Level is set Per the data sheet

BT is Low during TX and RX

VCC

PA_EN

C_RX

C_BT

0.2uSec

Time

TX RF Signal

Transmit Timing Diagram

Power ON / OFF Sequence

RX is Low during TX

0.2uSec

0.2uSec

0.2uSec

BT must be “LOW”

during TX and RX

modes. Apply a max

of 0.4 to pin-13.

Apply Vcc to pins

3,4, and 10

Both controls must be

OFF during transmit.

The order is not

critical. Apply a max of

0.4v to pins 9, and 14

For Transmit:

apply 3.1v to

pin-6

Note1: RF Signal for each specific mode is applied after the DC bias is applied

Note2: Total ON/OFF time includes from 10% of control switching to 90% of RF power

Note3: Listed values on diagram are typical. The maximum is 0.5us for each mode

LNA_EN

RX is Low during TX

RF signal ON time is

0.5uS max. Set RF

input to required level.