EK16
4
EK16U Rev J
PARTS LIST
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 informa
-
tion 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 pro
-
vided. 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. Position 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.
7. Hang the thermal washer near the end of a 6-32 X 1/2” screw. Slightly pull the amplifier away from the
heat sink face. Use the screw to position the thermal washer behind the amplifier and insert the screw
Reference
Manufacturer Part #
Description
QTY
HS23
Heatsink
1
HS20
Heatsink
1
310-43-120-41-001000
Mating Socket Strip
1 bag (2 each)
EVAL20
PC Board
1
TW07
Thermal Washer
1 box (10 each)
C1, C2
ZX7R105KTL
Capacitor, 1µF, ceramic
2
C3, C4
EC02
Capacitor, 33µF electrolytic
2
R
LIM
MP930 - 0.30 - 1%
Resistor, 0.3 Ω
1
R
LIM
MP930 - 0.20 - 1%
Resistor, 0.2 Ω
1
R
LIM
MP930 - 0.10 - 1%
Resistor, 0.1 Ω
1
