4 of 12
RF3334
Rev A6 DS061016
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Pin
Function
Description
Interface Schematic
1RFDEC
External decoupling capacitor for RF single-ended to differential converter.
2RF
LNA Input, Internally matched to 75
Ω. Should be AC-coupled.
3GND
Ground.
4IFVCC
5V supply for IF section.
5IFSET
IF Gain select. The resistance between this pin and pin 6 (IFSETB) deter-
mines 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 resis-
tance 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 differential
load across this pin and pin 8 (IFOUTB) should be 1k
Ω or greater for opti-
mal performance. The differential output impedance across this pin and
pin 8 in 10
Ω.
8IFOUTB
Complementary IF Amplifier Output.
9GND
Ground.
10
MIXLOADB
Complementary Mixer load.
11
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 performance.
100
Ω
RFDEC
VCC
VBIAS
RF
IFSETB
IFSET
IFSETB
IFSET
IF OUT
VBIAS
VCC
IF OUTB
VBIAS
VCC
MIXLOAD
MIXLOADB
MIXLOAD
MIXLOADB
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