4-234
RF2442
Rev B6 010612
4
Pin
Function
Description
Interface Schematic
1
VCC1
Supply voltage for the LNA. External RF and IF bypassing is required.
The trace length between the pin and the bypass capacitors should be
minimized. The ground side of the bypass capacitors should connect
immediately to ground plane. This pin connects to pin 8 through a
150
Ω resistor. This allows for simple biasing of the collector at pin 6.
Refer to Application Schematics 1 and 3.
2
GND1
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
3RF IN
RF input pin. This pin is internally DC-blocked and matched to 50
Ω for
frequencies above 1GHz. When using below 1GHz, it is recommended
that this pin be matched with series inductance to series-resonate out
the internal blocking capacitor. Refer to Application Schematics 1 and
2.
4
GND2
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
5NC
No connection. This pin is typically left unconnected or grounded.
6RF OUT
LNA Output pin. This pin is an open-collector output. It must be biased
to either VCC or pin 8 through a choke or matching inductor. This pin is
typically matched to 50
Ω with a shunt bias/matching inductor and
series blocking/matching capacitor. Refer to application schematics.
See pin 3.
7NC
No connection. This pin is typically left unconnected or grounded.
8
VCC2
Optional power supply connection for biasing pin 6. This pin connects
to pin 1 through a 150
Ω resistor. This allows for simple biasing of the
collector at pin 6. When used, this pin should be RF bypassed. Refer to
Application Schematics 1 and 3.
See pin 1.
150
Ω
VCC1
VCC2
BIAS
LNA OUT
To bias circuits
LNA IN
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