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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 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.

Case

Mode

C_TX

C_RX

C_Shared_RX

C_BT

LNA_Bias

1

WiFi RX

LOW*

HIGH

LOW

LOW*

HIGH

*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