RF5187_1 Datasheet, PDF (3/8 Pages) RF Micro Devices – LOW POWER LINEAR AMPLIFIER

RF5187
Pin
1
2
3
4
5
6
7
8
Pkg
Base
Function
RF IN
RF IN
PC
VCC
RF OUT
RF OUT
RF OUT
RF OUT
GND
Description
Interface Schematic
RF input. This input is DC-coupled, so an external blocking capacitor is
required if this pin is connected to a DC path. An optimum match to 50Ω is
obtained by providing an external series capacitor of 2.4pF and then a
shunt capacitor of 2.4pF. Those values are typical for 2140MHz; other val-
ues may be required for other frequencies.
Same as pin 1.
Power control pin. For obtaining maximum performance, the voltage on
this pin can be used to set correct bias level. For low power linear applica-
tions, it is recommended that a constant bias control loop be used (see
datasheet evaluation board schematic). A voltage of 0.5V or less at V_PC
brings the part into Power Down State.
Power supply pin for the bias circuits. External low frequency bypass capac-
itors should be connected if no other low frequency decoupling is nearby.
RF output and bias for the output stage. The power supply for the output
transistor needs to be supplied to this pin. This can be done through a
quarter-wavelength microstrip line that is RF-grounded at the other end, or
through an RF inductor that supports the required DC currents. Optimum
load impedance is achieved by providing a shunt capacitor of 1.8pF and a
series capacitor of 3.3pF. Those values are typical for 2140MHz; other val-
ues may be required for other frequencies. Since there are several output
pins available (which are internally connected), one pin can be used for
connecting the bias, another for connecting a (third) harmonic trap filter,
and the other pins for the RF output.
Same as pin 5.
Same as pin 5.
Same as pin 5.
Ground connection. The backside of the package should be connected to
the ground plane through a short path (i.e., vias under the device may be
required).
0.196
0.189
Package Drawing
0.157
0.150
0.0192
0.0138
-A-
0.004
0.002
0.050
0.244
0.230
0.123
0.107
0.087
0.071
0.065
0.055
EXPOSED
HEATSINK
8° MAX
0° MIN
0.035
0.016
0.0098
0.0075
Dimensions in inches.
Shaded lead is pin 1.
Rev A7 DS060630
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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