Apex Digital EK37, Руководство пользователя

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EK37
4 EK37U Rev A
BEFORE YOU GET STARTED
• All Apex amplifiers should be handled using proper ESD precautions.
• Always use the heat sink and thermal washers 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 in the device data sheet.
• Check for oscillations.
• Please refer to Application note, AN01 for general operating conditions.
ASSEMBLY
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. 42 pin receptacles are supplied with this evaluation kit. 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 CBP3, CBP4, CBP5, CBP6, CBP7 and CBP8 on the component side of the board.
5. Install diodes, D1, D2, D3, D4 and capacitors CBP1, CBP10 on the component side of the board. Ensure
that the orientation of the components match the circuit schematic drawing.
6. Next install all the smaller components on the board. This is done because it becomes difficult to install a
smaller part on the board once all the larger components are installed.
7. 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 jumpers and test points to com-
plete your application circuit.
8. 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.
9. 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.
10. 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.
11. Place the PCB assembly on the heatsink/amplifier assembly so that the hex spacers come through the
aligning holes near the corners of the amplifier location in the PCB. 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.
12. Use #8 X 1" sheet metal screws to mount the PCB to the heat sink at the four spacer-grommets.
13. #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.
14. Connect the external connections via the BNC connector and terminal strip. Hook up power supply and
signals as necessary. The amplifier is now ready for testing.