RF5345 Datasheet, PDF (18/20 Pages) RF Micro Devices – 2.4GHz TO 2.5GHz, 802.11b/g/n WiFi FRONT END MODULE

RF5345
Case
Mode
C_TX
C_RX
4 and 5
Bluetooth TX/RX
LOW*
LOW*
*These controls must be set to a logic low or grounded. Do not leave floating.
C_Shared_RX
LOW
C_BT
HIGH
LNA_Bias
LOW
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 6. BLUETOOTH TX/RX Control Settings and Signal Flow Diagram
As indicated in the table of fig-6, to optimize performance, controls C_TX and C_RX for the off branches of the SP3T should be
set “low” or grounded. Likewise, it is recommended to terminate the RX and Tx RF Ports in 50.
SHARED MODE (Simultaneous WiFi and BT Receive Operation)
The RF5345 Receive and Bluetooth circuits were specifically designed to address issues of simultaneous WiFi and Bluetooth
receive operation. Both signals can be received at the same time through the shared mode switch (setting pin 16 “high”).
Either radio, BT or WiFi, can be turned off to receive only one signal at a time. However, the C_SHARED_RX pin should remain
“high” to maintain good return loss at the port in operation. During shared mode, the active components are the RX branch of
the SP3T, the LNA, and the shared mode switch. Refer to figure 7 below for control settings and signal flow.
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DS120215