AD9910/PCBZ Analog Devices Inc, AD9910/PCBZ Datasheet - Page 40

• Manufacturer Part Number: AD9910/PCBZ
• Description: Direct Digital Synthesis Evaluation Board
• Manufacturer: Analog Devices Inc
• Series: AgileRF™r

Specifications of AD9910/PCBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Direct Digital Synthesizer
• Kit Application Type: Clock & Timing
• Silicon Core Number: AD9910
• Kit Contents: Board
• Design Resources: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
• Main Purpose: Timing, Direct Digital Synthesis (DDS)
• Embedded: No
• Utilized Ic / Part: AD9910
• Primary Attributes: 14-Bit DAC, 32-Bit Tuning Word Width
• Secondary Attributes: 1GHz, Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: Q3335404

AD9910
A change in state of the PROFILE pins aborts the current wave-
form, and the newly selected RAM profile is used to initiate a
new waveform.
The RAM_SWP_OVR pin switches to Logic 1 when the state
machine reaches the waveform end address, then returns to
Logic 0 at the waveform start address, toggling each time one
of these addresses is reached.
A graphic representation of the continuous bidirectional ramp
mode is shown in Figure 47. The circled numbers indicate specific
events as follows:
RAM_SWP_OVER
RAM ADRESS
I/O_UPDATE
WAVEFORM END ADDRESS
1
WAVEFORM START ADDRESS
Figure 47. Continuous Bidirectional Ramp Timing Diagram
M DDS CLOCK CYCLES
1
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Δ
t
2
Event 1—An I/O update or profile change has activated the RAM
continuous bidirectional ramp mode. The state machine initializes
to the waveform start address. The RAM_SWP_OVR pin resets to
Logic 0. The state machine begins incrementing through the
specified address range.
Event 2—The state machine reaches the waveform end address.
The RAM_SWP_OVR pin toggles to Logic 1.
Event 3—The state machine reaches the waveform start address.
The RAM_SWP_OVR pin toggles to Logic 0.
The continuous bidirectional ramp continues indefinitely until
the mode is changed.
Δ
t
3