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direct digital synthesis_reg

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sunnyc

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hi to all,
I would like to generate a triangular signal of frequency 1kHz and amplitude of 5V (as AD9833 power supply of 5V) using AD9833 and the MCLK provided from external waveform generator. The output signal generated has noisy and peak to peak amplitude of 1V.
The following words are loaded to AD9833 from micro-controller:
control register written with 0x2102
frequency register written with 0x746D & 0x4000
phase register written with 0xC000
and writing 0x2002 to reset
I am attaching circuit and the waveforms observed at TXD, RXD pins of micro-controller to load control register,frequency and phase register of AD9833 are correct. Kindly give reply me to get the above mentioned requirement.
 

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  • SCHEMATIC1 _ PAGE2.pdf
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