EK16
EK16U
1
EK16 PA90, PA91, PA92, PA93, PA98
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of linear power amplifiers circuits using the PA90/PA91/
PA92/PA93/PA98 pin-out. With ample breadboarding areas it is flexible enough to analyze a multitude of standard
or proprietary circuit configurations. Critical connections for power supply bypassing, compensation and current
limiting are pre-wired. Components not usually readily available in engineering labs are provided. External con-
nection to the evaluation kit can be made via the terminals at the edge of the circuit board. These terminal pads are
suitable for standard banana jacks or direct soldering of wires. The schematic is shown in Figure 2.
PARTS LIST
Part #
Description, Vendor
Quantity
HS23
Heatsink, Wakefield 232-200AB
1
HS20
Heatsink, Apex Microtechnology
1
MS06
Mating Socket Strip, Apex Microtechnology
1 bag, 2 ea.
EVAL20
PC Board, Apex Microtechnology
1
TW07
Thermal Washer, Apex Microtechnology
1 box, 10 ea.
ZX7R105KTL Capacitor, NOVACAP ST2225K501LLXW
2
EC02
Capacitor, United Chemicon KME400VB33RM16X31LL
2
CSR05
Resistor, Caddock MP930-0.30 1%
1
CSR06
Resistor, Caddock MP930-0.20 1%
1
CSR07
Resistor, Caddock MP930-0.10 1%
1
ASSEMBLY
1. See Figure 1. Solder the surface mount ceramic capacitors to the DUT side of the circuit board at C1 and C2.
2. Solder the electrolytic capacitors to the circuit board at C3 and C4. Match the polarity markings on the circuit
board with those on the capacitor body.
3. Select a current limiting resistor from the three values provided. See the product data sheet for information on
how to select a value. Apply a thin coating of thermal grease to the back of the resistor. Using a 4-40 X 1/4"
screw and 4-40 nut, mount the resistor to the lower of the two holes in the small heat sink provided. Solder this
assembly to the circuit board at R
LIM
. After soldering the resistor leads the tabs on the heat sink may be bent with
pliers to secure it to the circuit board.
4. Examine the large heat sink. Notice that there are several holes in the face of the heat sink. These are for
mounting various Apex Microtechnology amplifier models. The circuit board aligns the amplifier with the correct
mounting hole once the heat sink is attached to the circuit board. The heat sink can be mounted in either of two
positions. One position is used for mounting the amplifier to the heat sink
without
the mating socket strip (the
mounting hole of the amplifier is closer to the circuit board). Rotating the heat sink 180 degrees allows mounting
the amplifier
with
the mating socket strip (the mounting hole of the amplifier is further from the circuit board).
5. While developing your application circuit you will probably want to use the mating socket strip. Clip off the strip
after the 12th position. Insert the strip into the circuit board from the DUT side and solder one pin on the reverse
side. Check that the mating socket strip is fully seated against the circuit board then solder the remaining pins.
Insert the amplifier fully into the mating socket strip, noting the pin 1 locations on the amplifier and the circuit
board.
6. The four holes at the corners of the circuit board are for mounting #6 standoff spacers if desired. The remaining
two slotted holes are for mounting the large heat sink to the DUT side of the circuit board. Temporarily mount the
heat sink with 2 #6 X 1/2" self tapping screws from the opposite side of the circuit board. Do not fully tighten the
screws at this time. Check for alignment of the slot in the mounting tab of the amplifier with a hole in the heat
sink. Dismount and rotate the heat sink if necessary to achieve an alignment with a hole in the heat sink. Posi-
tion the heat sink so that the back of the amplifier mounting tab is flush with the heat sink then tighten the heat
sink mounting screws.
Evaluation Kit for
PA90/PA91/PA92/PA93/PA98 Pin-Out
EK16
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com
OCT 2012
EK16U REVH
