UG-207 Datasheet, PDF (13/16 Pages) Analog Devices – Evaluation Board for 1 GSPS DDS with 14-Bit DAC

Evaluation Board User Guide
OSK
To use the OSK function of the AD9910, select the Enable
Output Shift Keying check box. Set the Amplitude Scale
Factor to control the final amplitude of the signal. Select the
Use External OSK Pin box for manual control of the OSK.
Use the OSK Pin button to turn the OSK on/off manually. The
OSK Pin button controls a pin that can be driven externally.
Select the Enable Auto OSK to use the automatic OSK func-
tion. Set the Amplitude Ramp Rate and the Amplitude Step
Adjust using the text box and drop-down box provided. The
Load ARR @I/O Update box allows you to reload the ramp
rate timer when an I/O update is issued or when there is a
profile change.
Auxiliary Sources
The Auxiliary Sources area allows you to set the Output
Frequency and Phase Offset when using the internal RAM.
Refer to the RAM Operation section and the AD9910 data sheet
for more detailed information.
MULTICHIP SYNC CONTROL
UG-207
The Multi-Chip Sync window allows you to set up the sync
function. This allows you to sync multiple chips to one master
AD9910. Refer to the AD9910 data sheet for a full description
on multichip sync functions. The Input Sync Pulse Delay drop-
down box sets the input delay of the synchronization receiver in
150 ps steps. The Output Sync Pulse Delay sets the output
delay of the synchronization generator in 150 ps steps. The Sync
Window Delay sets the state that the internal clock generator
assumes when it receives a sync pulse. The Sync Enable check
box allows you to set the synchronization clock receiver to
active. The Sync Driver Enable check box sets the synchroniza-
tion clock generator to active. The Generate Sync Pulse area
allows you to select the sync pulse generation corresponding to
the rising or falling SYSCLK edge. The Sync Sample Error area
notifies you when there is a sync sample error. The No Error
message box changes to Error and blinks when an error occurs.
Using the Clear Error button, you can clear a sample error.
Refer to the AD9910 data sheet for details on synchronizing
multiple parts.
Figure 12. Multi-Chip Sync Window
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