PDSP16350SLASHB0SLASHGC datasheet(10/13 Pages) ZARLINK

10 / 13 page

PDSP16350

Modulated Phase

Relative phase jumps may be made with or without ampli-

tude modulation. For example, if a jump of 180 degrees is

required, this can be done with a value of :

DIN33:0 = 10 0000 0000 0000 0000 0000 0000 0000 0000

This is loaded into the phase increment register for one

cycle, then the normal increment value is re-loaded in the

following cycle.

Alternatively, if no amplitude modulation is needed, an

absolute jump to a phase value can be made, see Fig. 9. This

can be done by activating the JUMP input during one cycle and

also presenting the new phase value at the same time. For

example, if a jump to 270 degrees is required :

DIN33:0 = 11 0000 0000 0000 0000 0000 0000 0000 0000

The RES (reset) input can alternatively be used if a jump

to 0 degrees is needed. This avoids using the DIN inputs and

can be used with or without amplitude modulation. The reset

function is internally synchronised to the input clock.

Fig. 9 Phase Modulation Timing Diagram

Device Reset

Apply First

Data

First Result

Available

Absolute Phase

Jump

Absolute phase

jump result

PDSP16350/B0/GC Datasheet(PDF) 10 Page - Zarlink Semiconductor Inc