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RF2461
Rev B6 DS060925
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
1LNA GAIN
Controls the bypass feature of the LNA. A logic low (<1.0V) selects the
bypass mode. A logic high (>2.0V) turns on the LNA.
2
MIX GAIN
Controls the bypass feature of the mixer preamp. A logic low (<1.0V)
selects the bypass mode. A logic high (>2.0V) turns on the preamppreamp.
3LNA IN
LNA input pin.
4VCC1
VCC pin for all circuits except the LO. Buffer/bias circuitry.
5GND1B
LNA emitter. This pin provides the DC path to ground for the LNA. A lumped
element or a transmission line inductor can be placed between this pin
and ground to degenerate the LNA. This will decrease the gain and
increase the IP3 of the LNA. As the value of inductance is increased, these
effects will become more pronounced.
6LNA OUT
LNA output pin.
See pin 3.
7ISET2
An external resistor R2 connected to this pin sets the current of the
preamp and the mixer.
8ISET1
An external resistor R3 connected to this pin sets the current of the LNA
when IP SET is high (see pin 19).
9GND3B
Ground pin for preamp circuit. A 3.3nH inductor is used between pin 9 and
ground to degenerate the mixer preamp. Degenerating the preamp will
reduce the gain, increase the IP3 and affect the preamp input impedance.
10
MIX IN
Mixer preamp input pin.
See pin 9.
11
IF1-
Second differential output pin for the first mixer.
See pin 12.
12
IF1+
First differential output pin for the first mixer. Open collector. A current
combiner external network performs a differential to single-ended conver-
sion and sets the output impedance. A DC blocking cap must be present if
the IF filter input has a DC path to ground. Mixer (IF2+ and IF-) needs to
“see” a differential impedance between 2k
Ω to 4kΩ.
13
BYPASS
Bypass pin for the LO bias reference.
14
IF2-
Second differential output pin for the second mixer.
See pin 15.
LNA GAIN
MIX GAIN
LN A IN
LN A O U T
GN D 1B
MIX IN
GND3B
VCC2
IF1-
IF1+
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