RF2104
Pin
1
Function Description
Interface Schematic
Power supply for the bias circuits.This pin draws current proportional to
VCC1
VCC1
V
. When V is 2.5V the maximum current is about 30mA. When
PC
PC
PC
V
goes down to 0V the current also goes down to 0mA.
PC
To Bias
Stages
40
Ω
2
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane. A via hole under each
ground pin to the ground plane is recommended.
2
GND
Same as pin 2.
3
4
GND
VCC2
Power supply for the driver stage and interstage matching. An external
decoupling capacitor is required. The electrical length between the pin
and this capacitor affects the gain. See the application schematic for
recommended line length for optimum gain. For operation at frequen-
cies below 600MHz a series inductor is required.
VCC2
RF IN
From Bias
Stages
50Ω RF input. DC voltages are present at this pin, and an external
blocking capacitor is required when connecting this pin to a DC path to
ground. For optimum impedance matching, a shunt inductor to ground
is recommended; see the application schematic for details.
See pin 4 schematic.
5
RF IN
Same as pin 2.
Same as pin 2.
6
7
8
GND
GND
PC
Power control pin. A DC voltage between 0V and 3.0V can be applied See pin 1 schematic.
to control the gain. When no gain control is required this pin should be
connected to a fixed voltage between 2.5V and 3.0V. This pin draws
some current proportional to V . When V is 2.5V the maximum cur-
PC
PC
rent into this pin is about 1mA.
Same as pin 2.
Same as pin 2.
Same as pin 2.
9
GND
GND
GND
10
11
12
RF output. The power supply for the output stage also needs to be sup-
plied to this pin through the external matching circuit. The load imped-
ance to this pin should be 5+j0Ω for maximum output power.
RF OUT
RF OUT
From Bias
Stages
Same as pin 12.
Same as pin 2.
Same as pin 2.
Same as pin 2.
See pin 12 schematic.
13
14
15
16
RF OUT
GND
GND
GND
Rev B4 010507
2-13
RFMD [ RF MICRO DEVICES ]
