2-13
RF2104
Rev B4 010507
2
Pin
Function
Description
Interface Schematic
1VCC1
Power supply for the bias circuits.This pin draws current proportional to
VPC.WhenVPC is 2.5V the maximum current is about 30mA. When
VPC goes down to 0V the current also goes down to 0mA.
2GND
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.
3GND
Same as pin 2.
4VCC2
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.
5RF IN
50
Ω 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.
Seepin 4schematic.
6GND
Same as pin 2.
7GND
Same as pin 2.
8PC
Power control pin. A DC voltage between 0V and 3.0V can be applied
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 VPC. When VPC is 2.5V the maximum cur-
rent into this pin is about 1mA.
Seepin 1schematic.
9GND
Same as pin 2.
10
GND
Same as pin 2.
11
GND
Same as pin 2.
12
RF OUT
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+ j0
Ω for maximum output power.
13
RF OUT
Same as pin 12.
See pin 12 schematic.
14
GND
Same as pin 2.
15
GND
Same as pin 2.
16
GND
Same as pin 2.
40
Ω
PC
VCC1
To Bias
Stages
RF IN
VCC2
From Bias
Stages
RF OUT
From Bias
Stages
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