EK74
4
EK74 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 considerations.
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, a pre‐assembled EK91‐1 board is provided which contains the PA165 power amplifier and a heat
sink attached to it.
2. All the components are mounted on the components side the EVAL 164 board, except the 10 pin socket.
Mount two 10 pin sockets on the DUT side of the board.
3. After the sockets have been soldered, solder smaller components like resistors, capacitors, and diodes on
the component side of the board.
4. Components for RT1, RT2, RIN1, RIN2, RFB1, D1, D2, RLIM, C1, and C2 are provided. These should be sol‐
dered on EVAL 164 PC board on the component side. Ensure that the orientation of the capacitors C1 and
C2 match the circuit drawing.
5. To use the amplifiers in a simple inverting or non‐inverting configuration, short RS resistor with a bus wire.
RS resistor should only be used when using the amplifiers in a Howland current pump configuration.
6. Mount the BNC connectors, Banana jack connectors and test points on the component side of EVAL 164.
7. Once all the components are mounted on EVAL 164, please mount on the EK91‐1 into the socket on EVAL
164 on the DUT side.
8. After mounting the EK91‐1 on EVAL 164, use 91249A126 (4‐40 thread, 1.5” long) screws through EVAL
164 to hold EK91‐1 board. 4‐40 flange nuts are provided for these screws.
9. #8 hex standoffs are also provided with the kit. Install the #8 x 0.25” screws (91735A190), provided with
the kit, from the component side. Attach the standoffs to these screws on the corners of the board.
