UG-532 Datasheet, PDF (5/12 Pages) Analog Devices – Full-featured evaluation board

Evaluation Board User Guide
UG-532
Figure 4. AD569x(R) Evaluation Board Software Main Window
SOFTWARE OPERATION
The software for the AD569x(R) allows the user to program
values to the input and DAC registers of each DAC individually
or collectively.
Write to Input Register
GAIN Control
The logic level of the GAIN pin is set externally by LK4 or LK5.
To display the correct voltage, the gain selection must be set to
match the level of the pin.
Reference Control
Select Write to Input Register to load the value in the input
data control to the input register of any DACs selected in the
Select DACs to Use box.
Update DAC Register from Input Register
Select Update DAC Register from Input Register to copy the
value in a DAC input register to the corresponding DAC register.
DAC outputs are automatically updated with the appropriated
voltage.
Write to Input and DAC Register
Select Write to DAC Register to load the value in the input
data control to the Input and DAC register of any DACs
selected in the Select DACs to Use box. The DAC outputs
are automatically updated with the appropriated voltage.
LDAC CONTROL
Select Pulse LDAC to bring the LDAC pin low and then back
high. This copies the data from the input registers to the DAC
registers, and the outputs update accordingly. Any DAC updates
disabled by the LDAC mask settings are ignored.
The LDAC pin can also be set high or low by clicking the
appropriate radio button.
The AD5696R and AD5694R have an on-chip reference that can
be disabled to reduce power consumption. The AD5696R and
AD5694R software has a control that allows this function to
be used.
The AD5696 and AD5694 require an external reference. The
software for the AD5696 and AD5694 has a control that allows
the user to set the reference voltage.
Power-Down Control
Each of the DACs can be powered down individually. Each of the
DACs has an associated selection box allowing the part to operate
in normal mode, powered down with either a 1 kΩ or a 100 kΩ
resistor to ground or tristate. When the power-down setting for
each DAC is selected, click Write to Part to write the appropriate
values to the AD569x(R).
LDAC Mask Register
Each of the DACs can be set to accept or ignore LDAC pulses by
writing to the LDAC Mask Register. When the LDAC selections
are completed, click Write to Part to write the appropriate
values to the AD569x(R).
24-BIT COMMAND
On both control tabs of the software, the 24-bit commands sent to
the DAC are displayed. This shows what must be written to the
AD569x(R) to replicate the function of the evaluation board.
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