EK80
6
EK80U Rev A
SUGGESTED EVALUATION CIRCUIT DESCRIPTION
The circuit is configured as a single input power amplifier. This topology allows the user to evaluate each
channel of the CD64 independently as a single ended driver or simultaneously operating in bridge mode. The
circuit will accept a single ended input signal applied to either input. The voltage gain is approximately 25
Volts per Volt with the component values specified in the table. Please refer to the schematic diagram.
TEST ASSEMBLY
EQUIPMENT NEEDED
1. Power Supplies
2. Function Generator
3. Oscilloscope
4. Heatsink
TEST SETUP
1. Connect the power supply to +VS and -VS ports,
P1
and
P3
. Refer to product datasheet for voltage specifi
-
cations. If boost supplies are to be used connect them to the proper slots on
P8
.
2. Connect the BNC cable from the function generator to either
P9
or
P10
.
3. Do not insert the amplifier and heatsink assembly. Remove if inserted.
4. Power on the input signal and power supplies.
5. Measure voltages on all pins on the
TOP SIDE
to ensure that there is not short and to check that all the
pins read correct voltages.
6. Mount the amplifier and heatsink assembly on the PC board. If connecting a resistor load, short
RISO1
and/or
RISO2
with a bus wire. If a piezo load is connected, connect a resistor for
RISO1
and
RISO2
.
7. Input and output waveforms can be checked on an oscilloscope by connecting it to the test points
mounted on the board.
8. Begin the test with minimum values of input and supply voltages.
