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MAX5312 Evaluation Kit
Use the DAC scrollbar to set the 12-bit DAC data. The
adjacent label at the right of the scrollbar displays the
equivalent expected output-voltage values of the DAC.
Press the Load input register button to load the DAC
data into the input register of the MAX5312 (DAC out-
put unchanged). To load the input and DAC registers,
press the Load input and DAC registers button (DAC
output updated). To load the DAC register from the
input register, press the Load DAC register from
input register button (DAC output updated). Press the
Enter Shutdown Mode button to put the MAX5312 into
shutdown mode. To exit shutdown mode, press the
Exit Shutdown Mode button.
Hardware Control
The Hardware Control group box controls the signals
on the CLR , LDAC , UNI/ BIP , and the SHDN pins
through the GPIO pins of the microcontroller. By
default, the signals on CLR , LDAC , and SHDN are high
and the signal on UNI/ BIP is low.
Press the Clear the input and DAC registers (/CLR)
button to generate a negative pulse on the CLR pin and
asynchronously clear the input and DAC registers. The
DAC output is set to 0V in unipolar or bipolar mode.
Press the Update the DAC register (/LDAC) button to
generate a negative pulse on the LDAC pin and asyn-
chronously load the DAC register from the input regis-
ter. The DAC output immediately updates with the data
from the input register.
In the UNI//BIP group box, select the Bipolar Mode
radio button to evaluate bipolar mode. Select the
Unipolar Mode radio button to evaluate unipolar mode.
In the /SHDN group box, select the Enter Shutdown
Mode radio button to set the SHDN pin low to eval-
uate the shutdown mode and reduce the current con-
sumption. Select the Exit Shutdown Mode radio
button to set the SHDN pin high and resume normal
operation. Hardware control takes precedence over
software control.
SPI Interface
Within the SPI Interface group box, the Status group
box displays the last command that is sent to the
MAX5312.
Use the Send Command group box to manually enter
the SPI command in hex format in the edit box and
send the command to the MAX5312 by pressing the
Send button.
Detailed Description of
Hardware
The MAX5312 EV kit board provides a proven layout for
evaluating the MAX5312. The EV kit comes with the
MAX5312EAE+ installed.
Voltage Reference
By default, the on-board MAX6126 +5V external refer-
ence is connected to the REF pin of the MAX5312. To
use an external voltage reference, place the shunts of
JU10 to the 2-3 position. Attach the external reference
between +2V and +5.25V to the REF pad. Adjust the
Voltage Reference values in the program.
User-Supplied Signals
To use the MAX5312 EV kit with an external SPI inter-
face, install the shunts of JU1, JU4, JU5, and JU6 to
the 2-3 position. Connect the SCLK, DIN, CS , DOUT,
VCC, and GND lines from the external SPI interface to
the corresponding pads on the MAX5312 EV kit.
To apply the external signals to the SHDN and UNI/ BIP
pins of the MAX5312, install the shunts of JU2 and JU3
to the 2-3 position. Connect the external signals to the
SHDN and UNI/ BIP pads on the MAX5312 EV kit.
Optimal Measurement
To have the optimal measurements of the DAC output
voltage, use an external power supply. After program-
ming the output voltage for the DAC, disconnect the
USB cable from the EV kit to eliminate any noise com-
ing from the USB, and measure the output.
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