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MAX5550 Evaluation Kit
Detailed Description of
Hardware
The MAX5550 EV kit provides a proven layout for the
MAX5550. An on-board reference (MAX6161), USB-PC
connection circuitry, and jumpers to disconnect the on-
board microcontroller are included in the EV kit.
Reference
At power-up, the MAX5550 EV kit defaults to using the
on-board external 1.25V reference (MAX6161).
To use the internal reference, remove the shunt on
jumper JU4, select the Internal Reference Mode radio
button (Figure 2) and press the Load Setting(s) button.
For off-board external references, connect a 1.25V ref-
erence voltage to the REFIN pad and move the shunt
on jumper JU4 to the 2-3 position.
User-Supplied SPI Interface
To use the MAX5550 EV kit with a user-supplied SPI
interface, first move the shunts of JU1, JU2, and JU3 to
the 2-3 position. Next, move the shunts of JU5, JU6,
and JU7 to the 1-4 position. Then apply an external
2.7V to 5.25V power supply at the VCC pad. Lastly,
connect CS , SCLK, DIN, DOUT, and GND signals to the
corresponding CS , SCLK, DIN, DOUT, and GND pins of
header H3.
User-Supplied I 2 C Interface
To use the MAX5550 EV kit with a user-supplied I 2 C
interface, first move the shunts of JU1, JU2, and JU3 to
the 2-3 position. Next, move the shunts of JU5, JU6,
and JU7 to the 1-4 position. Then apply an external
2.7V to 5.25V power supply at the VCC pad. Lastly,
connect SCL, SDA, and GND signals to the corre-
sponding SCL, SDA, and GND pins of header H3.
Resistors R12 and R13 might need to be installed
depending on the I 2 C master used and the application.
User-Supplied Power Supply
The MAX5550 EV kit is powered completely from the
USB port by default. To power the MAX5550 with a user-
supplied power supply, the on-board microcontroller has
to be disconnected first. To disconnect the microcon-
troller, move the shunts of JU1, JU2, and JU3 to the 2-3
position. Next, move the shunts of JU5, JU6, and JU7 to
the 1-4 position. Then apply an external 2.7V to 5.25V
power supply at the VCC pad. Lastly, see the appropri-
ate User-Supplied SPI Interface or User-Supplied I 2 C
Interface sections for interface connections.
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