RFFM8205 Datasheet, PDF (5/9 Pages) RF Micro Devices – 2.4GHz to 2.5GHz 802.11b/g/n/ac WiFi Front End Module

RFFM8205
Switch Control Logic Truth Table
Operating Mode
PA_EN
Standby
Low
802.11b/g/n/ac TX High Power
High
802.11b/g/n/ac RX Gain
Low
802.11b/g/n/ac RX Bypass
Low
BT RX/TX
Low
Notes:
• PA_EN and TX switch control are tied together internally.
• High = 2.8 to VCC. Low = 0V to 0.2V.
LNA_EN
Low
Low
High
Low
Low
C_RX
Low
Low
High
High
Low
Timing Diagram
VCC
PA_EN
TX RF Signal
Transmit Timing Diagram
Power ON / OFF Sequence
Level is set Per the data sheet
Apply Vcc to pins
3,4, and 10
For Transmit:
apply 3.1v to
pin-6
RF signal ON time is
0.5uS max. Set RF
input to required level.
LNA_EN
C_RX
C_BT
RX is Low during TX
RX is Low during TX
BT is Low during TX and RX
Both controls must be
OFF during transmit.
The order is not
critical. Apply a max of
0.4v to pins 9, and 14
BT must be “LOW”
during TX and RX
modes. Apply a max
of 0.4 to pin-13.
Time
0.2uSec
0.2uSec
0.2uSec
0.2uSec
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
C_BT
Low
Low
Low
Low
High
RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421
For sales or technical support, contact RFMD at +1.336.678.5570 or [e-mail].
DS130930
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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