RF5345 Datasheet, PDF (16/20 Pages) RF Micro Devices – 2.4GHz TO 2.5GHz, 802.11b/g/n WiFi FRONT END MODULE

RF5345
Case
Mode
C_TX
C_RX
1
WiFi RX
LOW*
HIGH
*These controls must be set to a logic low or grounded. Do not leave floating.
C_Shared_RX
LOW
C_BT
LOW*
LNA_Bias
HIGH
16
15
14
LNA_Bias 1
RX_OUT ₂
TX_IN ₃
13
ANT
12 _{C_BT}
11
10 GND
Vreg ⁴
5
6
7
9 VCC_2
8
Figure 4. WiFi Receive Control Settings and Signal Flow Diagram
The supply voltage for the LNA (VDD) is provided through the LNA_Bias (pin 1) which simultaneously turns the LNA bypass
switch “OFF” and sets the device in High Gain mode. As in the case of the WiFi transmit mode, all unused control lines and RF
Ports must be properly terminated. Therefore, C_TX and C_BT are set “low” as well as the BT and TX_In RF ports terminated in
50 .
Due to the output impedance mismatch which results when C_Shared_RX (pin 16) is off, it is recommended to operate WiFi RX
Mode with pin 16 “high” and turning the Bluetooth radio off (see SHARED RX MODE control settings).
WiFi Bypass Mode
During Bypass Mode, the LNA_Bias (pin 1) is at 0V which enables the Bypass switch and sets the device in low gain. Due to the
additional switches involved in this path, the typical insertion loss is about 4.5dB within the frequency band 2.4GHz to
2.5GHz. See figure 5 below for signal flow and control settings.
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DS120215