RF2174
Pin
Function Description
Interface Schematic
Internally connected to the ground slug.
See pin 15.
1
2
GND
AT_EN
Control input for the PIN diode. The purpose of the PIN diode is to
attenuate the RF input drive level when the V
To PIN
diode
is low. This serves
APC
both to reduce the leakage through the device cause by self biasing
when driving with high level at the RF input, as well as to maintain a
good input match when the bias of the input stage is turned off. When
this pin is “high” the PIN diode control is turned on. See the Theory of
Operation for more details.
3k
Ω
AT_EN
GND1
VCC1
RF Input. This is a 50Ω 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.
3
RF IN
RF IN
PIN
GND 1
From Attn
From Bias
control circuit Stages
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.
4
5
GND1
VCC1
Power supply for the pre-amplifier stage and interstage matching. This See pin 3.
pin forms the shunt inductance needed for proper tuning of the inter-
stage match. Please refer to the application schematic for proper con-
figuration, and note that position and value of the components are
important.
Power Control for the driver stage and pre-amplifier. When this pin is
6
APC1
APC VCC
"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 +33dBm 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
To RF
Stages
pin is 5mA when V
=2.6V, and 0mA when V
=0V.
APC1
APC
GND
GND
Power Control for the output stage. See pin 6 for more details.
Power supply for the bias circuits.
See pin 6.
See pin 6.
7
8
APC2
VCC
Internally connected to the ground slug.
9
GND
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.
10
RF OUT
RF OUT
From Bias
GND
Stages
PCKG BAS
Same as pin 10.
Same as pin 10.
Same as pin 10.
Same as pin 10.
Same as pin 10.
11
12
13
RF OUT
RF OUT
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 15.
14
VCC2
2-278
Rev A8 060918
RFMD [ RF MICRO DEVICES ]
