UG-207 Datasheet, PDF (10/16 Pages) Analog Devices – Evaluation Board for 1 GSPS DDS with 14-Bit DAC

UG-207
The Edit Phase Offset dialog box (see Figure 8) appears by
double-clicking the Phase Offset text box in the Profiles window.
The Edit Phase Offset window allows you to set individual bits
in the phase offset word register. These bits can be typed in
decimal, hexadecimal, or binary format in the Register Values
area. This window also allows you to type in a tuning word and
see the correct decimal, hexadecimal, or binary representations
for this word. The Phase Offset spin box allows you to scroll
through the different tuning words one bit at a time using the
up and down arrows.
Figure 8. Edit Phase Offset Pop-Up Dialog Box
The Edit Output Scale Factor dialog box (see Figure 9) appears
by double-clicking the Amplifier SF text box in the Profiles
window. The Edit Output Scale Factor window allows you to
set individual bits in the ASF scale factor register. These can be
typed in decimal, hexadecimal, or binary format. This window
also allows you to type in a tuning word and see the correct
decimal, hexadecimal, or binary representation for this word.
The Output Scale Factor spin box allows you to scroll through
the different tuning words one bit at a time using the up and
down arrows.
Evaluation Board User Guide
Figure 9. Edit Output Scale Factor Pop-Up Dialog Box
Activate
In the Activate area of the Profiles window, you can select
which profile register to activate. The active profile register is
the one that supplies the frequency tuning and phase offset
words, along with the amplitude control and the DDS core. This
window controls three external pins, which can also be driven
by an external source.
Other Controls
Enable Profile ASF allows you to set the amplitude scale factor
in the Profile window. This allows the device to ramp to a value
less than full scale.
Enable Sine Out activates the sine output of the DDS; otherwise,
the cosine output is active.
Enable RAM allows you to enable the RAM playback from this
window. (See the RAM Operation section for more information
on using the RAM.)
The RS OVR message box alerts you when a RAM sweep is
complete.
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