RF2152
Pin
1
Function Description
Interface Schematic
Power supply for input bias circuitry. A 100 pF high frequency bypass
VCC
capacitor is recommended.
Interstage tuning. This pin will connect to a shunt inductor used for
interstage tuning. For 824MHz to 849MHz a 1.5nH discrete inductor is
used; for 877MHz to 925MHz a shorted transmission line presenting
0.7 nH of inductance or discrete inductor may be used. This inductor
should be placed as close to the pin as possible.
2
LTUNE
2
No connection. Grounding pin is recommended.
3
4
NC
VCC1
Power supply for stage 1. V should be fed through a 25nH or greater See pin 6.
CC
inductor with a decoupling capacitor on the V side.
CC
Ground for stage 1. Keep traces physically short and connect immedi- See pin 6.
ately to ground plane for best performance. This ground should be iso-
lated from the backside ground contact.
5
6
GND1
RF IN
RF input. An external DC blocking capacitor is required if this port is
connected to a DC path to ground or a DC voltage.
VCC1
GND1
RF IN
From Bias
Stages
Power Down control. When this pin is “low”, all circuits are shut off.
7
VPD
When this pin is 2.8 volts, all circuits are operating normally. V
PD
requires a regulated 2.8 V for the amplifier to operate properly over all
specified temperature and voltage ranges. A dropping resistor from a
higher regulated voltage may be used to provide the required 2.8 V. A
100 pF high frequency bypass capacitor is recommended.
Connect to pin 7.
8
9
10
11
12
VPD
NC
NC
NC
RF OUT
No connection. Grounding pin is recommended.
No connection. Grounding pin is recommended.
No connection. Grounding pin is recommended.
RF output and power supply for the output stage. The bias for the out-
put stage is provided through this pin and pin 13. An external matching
network is required to provide the optimum load impedance; see the
application schematics for details. The first shunt cap of the matching
circuit should be placed as close to the pin as possible.
RF OUT
From Bias
Stages
Same as pin 12.
See pin 12.
13
14
RF OUT
RF OUT
Harmonic trap. This pin connects to the RF output but is used for pro-
viding a low impedance to the second harmonic of the operating fre-
quency. An inductor or transmission line resonating with a shunt
See pin 12.
capacitor at 2f is connected to this pin.
0
No connection. Grounding pin is recommended.
15
16
NC
MODE
The mode pin allows higher efficiency operation in AMPS and low
power CDMA modes. MODE should be set “low” for highest efficiency
in AMPS/TACS and in low power (<+15 dBm) CDMA operation. MODE
should be set “high” for best linearity in high power CDMA operation.
MODE
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias. The pad should have a short thermal path to the ground
plane.
Pkg
Base
GND
Rev A8 001109
2-157
RFMD [ RF MICRO DEVICES ]
