Published on Apr 23, 2018 DutchBigEd
"This is a short demo of phase modulation of the Analog Devices AD9833 DDS chip with an Arduino (Atmega328p).
First part is where the hard sync input frequency is varied, than the phase of the hard sync is modulated en than the frequentie of the ad9833 is modulated.
The last part all three variables are modulated.
The sync input is PD2 (INT0), the phase input is ADC0 (PC0) and the Frequency input to control the AD9833 is ADC1 (PC1)."
Note this is the first post to feature the Analog Devices AD9833 DDS chip. You can find previous DIY videos from DutchBigEd here.
via Analog Devices:
"The AD9833 is a low power, programmable waveform generator capable of producing sine, triangular, and square wave outputs. Waveform generation is required in various types of sensing, actuation, and time domain reflectometry (TDR) applications. The output frequency and phase are software programmable, allowing easy tuning. No external components are needed. The frequency registers are 28 bits; with a 25 MHz clock rate, resolution of 0.1 Hz can be achieved. Similarly, with a 1 MHz clock rate, the AD9833 can be tuned to 0.004 Hz resolution.
The AD9833 is written to via a 3-wire serial interface. This serial interface operates at clock rates up to 40 MHz and is compatible with DSP and microcontroller standards. The device operates with a power supply from 2.3 V to 5.5 V.
The AD9833 has a power-down function (SLEEP). This allows sections of the device that are not being used to be powered down, thus minimizing the current consumption of the part, e.g., the DAC can be powered down when a clock output is being generated.
The AD9833 is available in a 10-lead MSOP package.
Applications
Frequency Stimulus/Waveform Generation
Liquid and Gas Flow Measurement
Sensory Applications–Proximity, Motion, and Defect Detection
Line Loss/Attenuation
Test and Medical Equipment
Sweep/Clock Generators
Time domain reflectometry (TDR) applications"
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