EK56 datasheet(2/4 Pages) APEX

2 / 4 page

14. From the "DUT side" of the PCB snap the spacer- grom-

mets into the holes at the four corners of the PCB. Notice

that the holes are slightly rectangular and match the spacer-

grommet's long and short sides to the holes in the PCB.

15. 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 ampli-

ﬁer back and forth, ending with the mounting holes of the

ampliﬁer over the mounting holes in the heatsink.

16. Attach the ampliﬁer to the heatsink with 4-40x½’ male-

female hex spacers (not supplied). These spacers serve

as alignment pins and aide in the assembly of the PCB to

the heatsink. Alternatively, use 4-40x¼’ machine screws

to mount the ampliﬁer to the heatsink. Do not over-tighten

the spacers or screws as this provides no thermal beneﬁt

and may break the hardware.

17. 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. Care-

fully lower the PCB assembly until the pins of the ampliﬁer

engage the cage jacks. Alternately, sight through the align-

ing holes in the PCB and match-up the PCB to the screws

used to mount the ampliﬁer. In either case be sure the pins

of the ampliﬁer are engaged with 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.

18. Using #8 X 1" sheet metal screws (not provided) mount the

PCB to the heat sink at the four spacer-grommets.

19. Hook up power and signals as necessary. The ampliﬁer

is now ready for testing.

FIGURE 1: SCHEMATIC DIAGRAM

ASSEMBLY CONT.

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APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

EVALUATION KIT FOR

MSA240KC & MSA260KC

EK56

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