RF2381
Pin
Function Description
Interface Schematic
RF output pin. This pin is DC-coupled and requires V through a bias
inductor sized accordingly to provide a high pass transformation with a
series capacitor.
1
RF OUT
CC
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
2
3
GND
GC
Analog gain control pin. This pin controls the gain of the IC. Minimum
gain occurs at V <0.4V and maximum gain is achieved with
GC
V
=2.0V. 50dB of linear gain control with little variation of input P
1dB
GC
is available.
RF input pin. This pin is DC-coupled.
4
5
RF IN
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Power supply. This pin should be connected to a regulated supply and
requires a series inductor and bypass capacitor. Voltage is supplied
through this pin to the first stage collector; this voltage also controls the
bias. Gain may be tuned by adjusting the value of the feed inductor.
6
VCC
Application Schematic
1850MHz to 1910MHz
33 nF
100 pF
RF IN
GC
4
5
6
3
2
1
ATT
ATT
1 pF
2.7 nH
33 pF
VCC
RF OUT
VCC
33 nF
2.7 nH*
Note orientation of
package in this schematic.
*For W-CDMA, use 2.2 nH
4-452
Rev A2 060907
RFMD [ RF MICRO DEVICES ]
