RF2461PCBA-41X Ver la hoja de datos (PDF) - RF Micro Devices
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RF2461PCBA-41X Datasheet PDF : 14 Pages
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RF2461
Pin Function Description
Interface Schematic
1
LNA 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.
LNA GAIN
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.
MIX GAIN
3
LNA IN
LNA input pin.
LNA OUT
LNA IN
4
VCC1
VCC pin for all circuits except the LO. Buffer/bias circuitry.
5
GND1B
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.
6
LNA OUT LNA output pin.
See pin 3.
7
ISET2
An external resistor R2 connected to this pin sets the current of the
preamp and the mixer.
8
ISET1
An external resistor R3 connected to this pin sets the current of the LNA
when IP SET is high (see pin 19).
9
GND3B
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.
GND1B
VCC2
MIX IN
GND3B
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 2kΩ to 4kΩ.
IF1-
IF1+
13
BYPASS Bypass pin for the LO bias reference.
14
IF2-
Second differential output pin for the second mixer.
See pin 15.
Rev B6 DS060925
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