2-122
RF2138
Rev A9 011031
2
Pin
Function
Description
Interface Schematic
1NC
Not connected. Connect this pin to the ground plane for compatibility
with future packages.
2
GND2
Ground connection for the driver stage. To minimize the noise power at
the output, it is recommended to connect this pin with a trace of about
40mil to the ground plane. This will slightly reduce the small signal
gain, and lower the noise power. It is important for stability that this pin
have it’s own vias to the ground plane, minimizing common inductance.
See pin 15.
3RF IN
RF Input. This is a 50
Ω input, but the actual impedance depends on the
interstage matching network connected to pin 5. An external DC block-
ing capacitor is required if this port is connected to a DC path to ground
or a DC voltage.
4
GND1
Ground connection for the pre-amplifier stage. Keep traces physically
short and connect immediately to the ground plane for best perfor-
mance. It is important for stability that this pin has it’s own vias to the
groundplane, to minimize any common inductance.
See pin 3.
5
VCC1
Power supply for the pre-amplifier stage and interstage matching. This
pin forms the shunt inductance needed for proper tuning of the inter-
stage match. Refer to the application schematic for proper configura-
tion. Note that position and value of the components are important.
See pin 3.
6APC1
Power Control for the driver stage and pre-amplifier. When this pin is
"low," all circuits are shut off. A "low" is typically 0.5V or less at room
temperature. A shunt bypass capacitor is required. During normal oper-
ation this pin is the power control. Control range varies from about 1.0V
for -10dBm to 2.6V for +35dBm RF output power. The maximum power
that can be achieved depends on the actual output matching; see the
application information for more details. The maximum current into this
pin is 5mA when VAPC1=2.6V, and 0mA when VAPC=0V.
7APC2
Power Control for the output stage. See pin 6 for more details.
See pin 6.
8VCC
Power supply for the bias circuits.
See pin 6.
9NC
Not connected. Connect this pin to the ground plane for compatibility
with future packages.
10
RF OUT
RF Output and power supply for the output stage. Bias voltage for the
final stage is provided through this wide output pin. An external match-
ing network is required to provide the optimum load impedance.
11
RF OUT
Same as pin 10.
Same as pin 10.
12
RF OUT
Same as pin 10.
Same as pin 10.
13
2F0
Connection for the second harmonic trap. This pin is internally con-
nected to the RF OUT pins. The bonding wire together with an external
capacitor form a series resonator that should be tuned to the second
harmonic frequency in order to increase efficiency and reduce spurious
outputs.
Same as pin 10.
14
NC
Not connected.
15
VCC2
Power supply for the driver stage and interstage matching. This pin
forms the shunt inductance needed for proper tuning of the interstage
match. Please refer to the application schematic for proper configura-
tion, and note that position and value of the components are important.
16
VCC2
Same as pin 15.
Same as pin 15.
Pkg
Base
GND
Ground connection for the output stage. This pad should be connected
to the ground plane by vias directly under the device. A short path is
required to obtain optimum performance, as well as to provide a good
thermal path to the PCB for maximum heat dissipation.
GND1
RF IN
VCC1
From Bias
Stages
GND
VCC
To RF
Stages
GND
APC
GND
PCKG BASE
RF OUT
From Bias
Stages
GND2
VCC2
From Bias
Stages
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