RF3858

3.0 V TO 4.2V, ISM BAND TRANSMIT/RECEIVE

MODULE WITH DIVERSITY TRANSFER SWITCH

trademarks are the property of their respective owners. ©2009, RF Micro Devices, Inc.

DS130424

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

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Pin

Function

Description

1

LNA IN

RF Input to the low noise amplifier, 50Ω nominal impedance.

2

LNA VREF

Voltage to set the bias level to the LNA, 3.0V nominal, can be used to shut the LNA off or to adjust the quiescent current.

3

LNA SELECT

A logic low selects the high gain mode of the LNA, logic high selects the low gain mode.

4

RX SWITCH

INPUT

RF port from the Switch going to the LNA input, 50Ω nominal impedance.

5

TX SWITCH

INPUT

RF port from the Switch going to the PA input, 50Ω nominal impedance.

6

GND

Ground.

7

PA VCC2

Voltage supply for the Power Amplifier, nominal voltage is 3.6V.

8

GND

Ground.

9

GND

Ground.

10

PA OUT

RF output from the Power Amplifier, 50Ω nominal impedance.

11

GND

Ground.

12

GND

Ground.

13

GND

Ground.

14

PA BIAS

Voltage supply for the Power Amplifier bias network, nominal voltage is 3.6V.

15

PA VREG

Voltage to set the bias level of the Power Amplifier, nominal voltage is 2.85V.

16

GND

Ground.

17

GND

Ground.

18

PA IN

RF Input to the Power Amplifier, 50Ω nominal impedance.

19

GND

Ground.

20

PA VCC1

Voltage supply for the Power Amplifier, nominal voltage is 3.6V

21

VTX2

Logic input to the Switch, see Logic Table below.

22

VTX1

Logic input to the Switch, see Logic Table below.

23

ANT2

RF port from the Switch going to Antenna 1, 50Ω nominal impedance.

24

ANT1

RF port from the Switch going to Antenna 2, 50Ω nominal impedance.

25

VRX1

Logic input to the Switch, see Logic Table below.

26

VRX2

Logic input to the Switch, see Logic Table below.

27

LNA VCC

LNA Collector Voltage, nominal voltage is 3.0V.

28

GND

Ground.

29

LNA OUT

RF Output from the low noise amplifier, 50Ω nominal impedance.

30

GND

Ground.

31

GND

Ground.

32

GND

Ground.

Pkg Base

GND

The central metal base of package provides DC and RF GND as well as heat sink for the amplifier.