AD9915SLASHPCBZ datasheet(19/51 Pages) AD

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Data Sheet

AD9915

THEORY OF OPERATION

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Rev. G | 19 of 51

Table 6. Data Source Priority

Priority

DDS Signal Control Parameters

Data Source

Conditions

If output phase offset control is desired, enable profile mode and use the profile registers and profile pins

accordingly to control output phase adjustment.

If output amplitude control is desired, enable profile mode and use the profile registers and profile pins accordingly

to control output amplitude adjustment. Note that the OSK enable bit must be set to control the output amplitude.

DRG

The digital ramp modulation mode is the next highest priority mode. If the DRG is enabled to sweep output

frequency, phase, or amplitude, the two parameters not being swept can be controlled independently via the profile

mode.

Profiles

The profile modulation mode is the next highest priority mode. Profile mode can control all three parameters

independently, if desired.

Lowest Priority

Parallel port

Parallel data port modulation has the lowest priority but the most flexibility as far as changing any parameter at the

high rate. See the Programming and Function Pins section.

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