SKY65112-84LF Skyworks Solutions, SKY65112-84LF Datasheet - Page 7

• Manufacturer Part Number: SKY65112-84LF
• Description: Linear Power Amplifier Driver
• Manufacturer: Skyworks Solutions

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Evaluation Board
The SKY65112 Evaluation Board is used to test the performance
of the SKY65112 power amplifier driver. Schematic diagrams
for evaluation circuits, optimized for output third order intercept
(OIP3) are shown below. Evaluation board schematics and bills
of materials are shown for GSM operation at 940 MHz and also
for DCS/UMTS/CDMA operation near 2 GHz. The mounting
footprint for the SKY65112 is shown in the mounting
footprint schematic.
The evaluation board also contains a probe fixture section which
makes it possible to conveniently measure scattering parameters
with ground-signal-ground probes and a vector network analyzer,
directly at the input and output pins of the package. Scattering
parameters measured in this fixture are available upon request.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration.
1. Paths to ground should be made as short as possible.
2. The exposed paddle ground pad of the SKY65112 power
NOTE: Junction temperature (T
3. External bypass capacitors are required on the V
4. Bias resistors R
A suggested matching circuit is shown in the evaluation board
schematic.
amplifier has special electrical and thermal grounding
requirements. This paddle is the main thermal conduit for
heat dissipation. Since the circuit board acts as the heat sink,
it must shunt as much heat as possible from the amplifier. As
such, design the connection to the ground pad to dissipate the
maximum power produced to the circuit board. Multiple vias to
the grounding layer are required.
pins 1.
determine the reference current, I
controls the supply current through the amplifier stage.
poor connection to the exposed paddle and ground. This
reduces the lifetime of the device.
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2
and R
4
and the voltage applied to V
J
) of the device increases with a
REF
, into pin 1. This current
CC
line and on
REF
Test Procedure
Use the following procedure to set up the SKY65112 Evaluation
Board for testing. Refer to the mounting footprint schematic
for guidance:
1. Connect a 5 V supply to V
2. Connect a positive supply to V
3. Connect a signal generator to the RF signal input port. Set it to
4. Connect a spectrum analyzer to the RF signal output port.
5. Enable the power supply.
6. Adjust V
7. Enable the RF signal.
8. Take measurements.
CAUTION: If any of the input signals exceed the rated maximum
Recommended Solder Reflow Profiles
Refer to the
Application Note.
Tape and Reel Information
Refer to the
Tape and Reel Package Orientation”
limiting function of the power supply to 520 mA.
the desired RF frequency at a power level of -15 dBm or less
to the evaluation board, but do not enable the RF signal.
REF
values, the SKY65112 Evaluation Board can be
permanently damaged.
“Recommended Solder Reflow Profile”
“Discrete Devices and IC Switch/Attenuators
to set supply current (I
PRELIMINARY DATA SHEET • SKY65112-84LF
CC
. If available, enable the current
REF
.
Application Note.
CCQ
) to 260 mA
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