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RF5345

DS120215

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

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.

Case

Mode

C_TX

C_RX

C_Shared_RX

C_BT

LNA_Bias

4 and 5

Bluetooth TX/RX

LOW*

LOW*

LOW

HIGH

LOW

*These controls must be set to a logic low or grounded. Do not leave floating.

8

7

6

5

1

2

3

4

12

11

10

9

13

14

15

16

LNA_Bias

RX_OUT

TX_IN

Vreg

C_BT

ANT

GND

VCC_2