RF3854PCBA-41X View Datasheet(PDF) - RF Micro Devices

Part Name

Description

MFG CO.

RF3854PCBA-41X

LOW NOISE, MULTI-MODE, QUAD-BAND, QUADRATURE MODULATOR AND PA DRIVER

RF Micro Devices 

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RF3854

Pin Function Description

Interface Schematic

12

GC

Gain control voltage. Maximum output power at 2.0V. Minimum output

power at 0V. When the chip is enabled the input impedance is 10kΩ to

VCC2

1.67VDC. When the chip is powered down a FET switch is opened and the

input goes high impedance.

4 kΩ

10 kΩ

-

1.7 V +

13

RF OUT

Differential low band PA driver amplifier output.

LB N

This output is intended for low band (GSM850/900) operation and drives a

differential SAW.

A bypass mode allows the low band PA driver amplifier’s input to be

switched between the signal from the modulator and the signal applied at

LOLB. This enables a GMSK-modulated signal on the LOLB input to be

switched into the RF signal path.

The output is an open collector. The outputs are matched off-chip.

VCC

VCC

VCC

RF OUT LB P

RF OUT LB N

14

RF OUT

Complementary differential low band PA driver amplifier output.

LB P

See pin 13.

See pin 13.

15

RF OUT

Differential high band PA Driver amplifier output.

HB N

This output is intended for DCS1800/PCS1900 band operation.

A bypass mode allows the high band PA driver amplifier’s input to be

switched between the signal from the modulator and the signal applied at

LOHB. This enables a GMSK-modulated DCS1800/PCS1900 signal on the

LOHB input to be switched into the RF signal path.

The output is an open collector. The outputs are matched off-chip.

VCC

VCC VCC

RF OUT HB P

RF OUT HB N

16

RF OUT

Complementary differential high band PA driver amplifier output.

HB P

See pin 15.

17

RF OUT

Differential high band PA driver amplifier output.

WB N

This output is intended for wide band (W-CDMA) applications.

The output is an open collector. The output are matched off-chip.

See pin 15.

VCC

VCC VCC

RF OUT WB P

RF OUT WB N

18

RF OUT

Complementary differential wideband PA driver amplifier output.

WB P

See pin 17.

19

GND

Ground.

See pin 17.

Rev A1 DS070313

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

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

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