EK49
4
EK49U Rev A
BEFORE YOU GET STARTED
• All Apex Microtechnology amplifiers should be handled using proper ESD precautions.
• Always use the heatsink included in this kit.
• Always use adequate power supply bypassing.
• Do not change the connections while the circuit is powered.
• Initially set all power supplies to the minimum operation levels allowed on the device data sheet.
• Check for oscillations.
• Please refer to Application Note, AN01 for general operating conditions.
ASSEMBLY INSTRUCTIONS
During the assembly, please refer to the circuit schematics, assembly drawings, and the data sheet of the
part being used on the evaluation kit.
1. Note that each side of the circuit board is identified as either the component side or the DUT side. The
component side has the designators printed on that side.
2. All through hole components (except the cage jacks) are installed on the component side of the board and
soldered on the DUT side.
3. A pin receptacle is supplied with this evaluation kit. Break it into two strips 11 and 12 pins long. Insert the
carrier strip through the DUT side and solder the cage jacks on the component side. Once the cage jacks
are soldered, remove the carrier strip, leaving only cage jacks soldered on the board.
4. Install C1, CBP1, CBP3, CBP4, CBP6, CC1 and CC2 on the component side of the board.
5. Install in X1, X2, X3 and X4.
6. Next, install all the smaller components on the board. This is done because it becomes difficult to install a
small part on the board once all the larger components are installed.
7. Install diodes and capacitors CBP2 and CBP5 on the component side of the board. Ensure that the orienta
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tion of the components match the circuit schematic drawing.
8. Mount the BNC connector provided with the kit (146510CJ) and solder it to the board. Also mount the
banana jacks on the board. Install other miscellaneous components like test points and S1 switch to com
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plete your application circuit.
9. From the DUT side of the PCB, snap the spacer-grommets into the holes at the four corners of the PCB.
Notice that the holes are slightly rectangular and match the spacer-grommets long and short sides to the
holes in the PCB.
10. Apply a thin, uniform layer of thermal grease to the amplifier; a straight edge may be useful here. Position
the amplifier over the mounting holes in the heatsink. Firmly push the amplifier onto the heatsink while
slightly rotating the amplifier back and forth, ending with the mounting holes of the amplifier over the
mounting holes in the heatsink.
11. Use 4-40x¼' machine screws to mount the amplifier to the heatsink. Do not over-tighten the screws as
this provides no thermal benefit and may break the hardware.
12. Carefully lower the PCB assembly until the pins of the amplifier engage the cage jacks and then continue
pushing the PCB assembly in the area between the amplifier's pins until the four spacer grommets at the
four corners of the PCB touch the heatsink. At this point the PCB should not be bowed.
13. Use #8 sheet metal screws to mount the PCB to the heat sink at the four spacer-grommets.
14. #8 hex stand offs (91841A009) are also provided with the kit. Install the # 8 x 0.375"screws (91735A190),
provided with the kit, from the component side. Attach the standoffs to these screws on the corners of
the board. Refer to the assembly drawings while installing the standoffs.
