Apex Digital EK31 Quick Start Manual Download Page 5

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EK31

EK31U Rev A

BEFORE YOU GET STARTED

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All Apex amplifiers should be handled using proper ESD precautions.

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Always use the heat sink and thermal washers included in this kit.

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Always use adequate power supply bypassing.

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Do not change the connections while the circuit is powered

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Initially set all power supplies to the minimum operation levels allowed in the device data sheet.

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Check for oscillations.

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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 the components are installed on the component side of the board and soldered on the DUT side.
3. A T0

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3 socket (MS03) is supplied with this kit. Using #6 x 0.75" screws (91735A151) provided with the kit,

mount the socket from the DUT side of the board. The MS03 socket incorporates two cavities to retain the
#6 x 5/16" nuts (91841A007). Insert one #6 nut into each cavity. Make sure the nuts are fully seated into
the cavities.

4. Two heat sinks are provided with this kit. Use the larger heat sink (HS13) for the Power amplifiers. Attach

the heat sink to the board from the DUT side, using #8 x 0.375" screws (91735A192). Refer to the assem

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bly drawings for the correct way to attach the heat sink. This is done to keep the socket tightly mounted to
the board and to provide support, and eliminate stress so that the socket pins do not move while being
soldered from the component side. Once the socket pins are soldered, and the socket is now attached to
the board, remove the heat sink, and all the screws.

5. First 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.

6. Refer to the

NOTE

below the parts list for components to be included for a specific Power amplifier.

7. Except for RLIMA, RLIMB and CC, all other components are common for the seven Power amplifiers.

Install the common components first.

8. Ensure that the orientation of the electrolytic capacitors and the diodes match the circuit schematic

drawing.

9. Mount the BNC connector provided with the kit (146510CJ) and solder it to the board. Also mount the

terminal strip (TSO1) provided in the kit. Refer to the assembly drawings before mounting the terminal
strip.

Reference