AD9913SLASHPCBZ datasheet(17/32 Pages) AD

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Data Sheet

AD9913

Rev. E | Page 17 of 32

PS[0]

PS[1]

BIDIRECTIONAL MODE (EDGE TRIGGERED)

NO-DWELL BIT = x

BIDIRECTIONAL MODE (LEVEL TRIGGERED)

NO-DWELL BIT = 0

NO-DWELL BIT = 1

PS[0]

PS[1]

PS[0]

PS[1]

Figure 24. Display of Bidirectional Ramp Capability

Using the External Profile Pins

COMBINATION OF MODES (EDGE TRIGGERED)

PS[0]

PS[1]

RAMP UP

MODE

RAMP UP

MODE

BIDIRECTIONAL

MODE

RAMP DOWN

MODE

Figure 25. Combination of Sweep Modes Using the External Profile Pins

Clear Functions

The AD9913 allows for a programmable continuous zeroing of

the sweep logic and the phase accumulator as well as clear-and-

release, or automatic zeroing function. Each feature is

individually controlled via bits in the control registers.

Continuous Clear Bits

The continuous clear bits are simply static control signals that

hold the respective accumulator (and associated logic) at zero

for the entire time the bit is active.

Clear-and-Release Function

The auto clear auxiliary accumulator bit, when active, clears

and releases the auxiliary accumulator upon receiving an

I/O_UPDATE or change in profile bits.

The auto clear phase accumulator, when active, clears and

releases the phase accumulator upon receiving a I/O_UPDATE

or a change in profile bits.

The automatic clearing function is repeated for every

subsequent I/O_UPDATE or change in profile bits until the

control bit is cleared.

These bits are programmed independently and do not have to

be active at the same time. For example, one accumulator may

be using the clear and release function while the other is

continuously cleared.

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