RF5745SR datasheet(9/11 Pages) RFMD

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RF5745

DS120214

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

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

RF5745 Biasing Instructions:

• 802.11b/g and ZigBee® Transmit

• Connect the FEM to a signal generator at the input and a spectrum analyzer at the output.

•Bias VCC to 4.0V first with VREG=0.0V

• Refer to switch operational truth table to set the control lines at the proper levels for WiFi TX.

• Turn on

VREG to 2.85V (typ.). VREG controls the current drawn by the 802.11b/g and ZigBee® power amplifier and the current

should quickly rise to ~100mA±20mA for a typical part but it varies based on the output power desired. Be extremely careful

not to exceed 3.4V on the

VREG pin or the part may exceed device current limits.

• 802.11 b/g and ZigBee® Receive

• To Receive WiFi set the switch control lines per the truth table below.

• BluetoothTM Receive

• To Receive BluetoothTM set the switch control lines per the truth table below.

Switch Control Logic

*The FEM can simultaneously receive WiFi and BluetoothTM in the WiFi RX and BT RX Mode.

Mode

C_RX

C_TX

C_BT

BluetoothTM

WiFi Tx

WiFi Rx

WiFi Rx/BT

RF5745SR Datasheet(PDF) 9 Page - RF Micro Devices