2-4
RF5111
Rev A1 060921
Pin
Function
Description
Interface Schematic
1VAT EN
Control pin for the pin diode. The purpose of the pin diode is to attenu-
ate RF drive level when VAPC is low. This serves to reduce RF leakage
through the device caused by self-biasing under high RF drive levels. A
good input match is maintained when the input stage bias is turned off
by the same mechanism. When this pin is set high, pin diode attenua-
tion control is turned on. (See Theory of Operation for details.)
2RF 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.
3GND1
Ground connection for the preamplifier stage. For best performance,
keep traces physically short and connect immediately to the ground
plane. It is important for stability that this pin has it’s own vias to the
groundplane, to minimize any common inductance.
See pin 2.
4VCC1
Power supply for the preamplifier 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, and note that position and value of the components are important.
See pin 2.
5APC1
Power Control for the driver stage and preamplifier. 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 approxi-
mately 1.0V for -10dBm to 2.6V for +33dBm RF output power. The
maximum power achievable 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.
6APC2
Power control for the output stage. See pin 6 for more details.
See pin 6.
7VCC
Power supply for the bias circuits.
See pin 6.
8NC
Not connected.
9NC
Not connected.
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.
RF IN
GND
1
VCC1
From Bias
Stages
PIN
From Attn
control circuit
GND
VCC
To RF
Stages
GND
APC
GND
PCKG BASE
RF OUT
From Bias
Stages
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