Analog Devices AD8460 User Manual page 13

Evaluation Board User Guide
2. Once the chip is reset, use the Input Mode Switch to select the APG mode.
3. Make the following changes in the Output Voltage Levels block to generate a square wave of +/−30 V
amplitude, as a simple example.
a. Pattern Depth indicates the number of output states the analog pattern generates before repeating. A
b. To create a square wave of 60 Vp-p, set the Output Voltage Level box 1 to '30', and Box 2 to '−30'.
4. To protect the AD8460 from overheating, do the following in the temperature column of the Protection Panel:
a. Check the Enable Protection box.
b. Check the Enable Flag Latch box.
c.
5. Wake the AD8460 HVDAC by unticking HV DAC SLEEP.
6. Send the entered values to the hardware through SPI by clicking Apply Changes on the top left of the plugin.
7. Turn on SYNC signal from an external function generator. Note: SYNC is a 3.3 V square wave signal. Any SYNC
frequency up to 20 MHz may be used. Make sure to consider the slew rate limitations of the part when choosing
SYNC frequency.
8. The output waveform can be measured at OUT_1 test point using an oscilloscope.
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Figure 22. AD8460 Plugin Reset Chip Button
square wave pattern consists of only two voltage levels. So, set the Pattern Depth to 2. In this example,
the user instructs the DAC to create a repeating pattern from only the first two levels in the list of 16
values.
The corresponding hexadecimal DAC code values automatically reflect this change.
Enter '150' in the Desired Value box.
Note: See the Application Specific Information
A
Figure 23. AD8460 APG Mode Setup
section for limitations in this function.
B
C
D
E
F
AD8460
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