RF3334PCBA datasheet(4/14 Pages) RFMD

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8-460

RF3334

Rev A5 031020

Function

Description

Interface Schematic

1RFDEC

External decoupling capacitor for RF single-ended to differential con-

verter.

2RF

LNA Input, Internally matched to 75

Ω. Should be AC-coupled.

3GND

Ground.

4IFVCC

5V supply for IF section.

IFSET

IF Gain select. The resistance between this pin and pin 6 (IFSETB)

determines the gain of the IF amplifier. Maximum gain is achieved by

placing a short circuit between the pins. Larger values of resistance will

reduce the IF gain according to the following equation where R is the

value of resistance between pins 5 and 6.

IFGain=20log(1600/(R=75))15.

6IFSETB

Complementary IF Gain select.

7IFOUT

IF Amplifier Output. Differential output of the IF amplifier. The differen-

tial load across this pin and pin 8 (IFOUTB) should be 1k

Ω or greater

for optimal performance. The differential output impedance across this

pin and pin 8 in 10

Ω.

8IFOUTB

Complementary IF Amplifier Output.

9GND

Ground.

MIXLOADB

Complementary Mixer load.

MIXLOAD

Differential output of the RF mixer. A resonant load should be applied to

this pin and pin 10 (MIXLOADB) that will act as a bandpass filter at the

desired IF frequency. VCC should be supplied to this pin via an inductor

or a resistor. Use of a resistor will degrade intermodulation perfor-

mance.

100

Ω

RFDEC

VBIAS

IFSETB

IFSET

IFSETB

IFSET

IF OUT

VBIAS

IF OUTB

VBIAS

MIXLOAD

MIXLOADB

MIXLOAD

MIXLOADB

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