AD9913/PCBZ Analog Devices Inc, AD9913/PCBZ Datasheet - Page 17

• Manufacturer Part Number: AD9913/PCBZ
• Description: Eval Board
• Manufacturer: Analog Devices Inc
• Series: AgileRF™r

Specifications of AD9913/PCBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Direct Digital Synthesizer
• Kit Application Type: Clock & Timing
• Silicon Core Number: AD9913
• Kit Contents: Board
• Tool / Board Applications: D/A Converter
• Main Purpose: Timing, Direct Digital Synthesis (DDS)
• Embedded: No
• Utilized Ic / Part: AD9913
• Primary Attributes: 10-Bit DAC, 32-Bit Tuning Word Width
• Secondary Attributes: 250MHz, Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PS[0]
PS[1]
PS[0]
PS[1]
PS[0]
PS[1]
E0
S0
E0
S0
E0
S0
Figure 24. Display of Bidirectional Ramp Capability
NO-DWELL BIT = x
BIDIRECTIONAL MODE (LEVEL TRIGGERED)
BIDIRECTIONAL MODE (EDGE TRIGGERED)
NO-DWELL BIT = 0
NO-DWELL BIT = 1
Using the External Profile Pins
Rev. A | Page 17 of 32
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.
Figure 25. Combination of Sweep Modes Using the External Profile Pins
PS[0]
PS[1]
E0
S0
COMBINATION OF MODES (EDGE TRIGGERED)
RAMP UP
MODE
RAMP DOWN
MODE
BIDIRECTIONAL
MODE
RAMP UP
MODE
AD9913