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AD9834 waveformgenerator-problem

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ubotheju

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AD9834 programming

I am going to prepare waveform generator using AD9834. I programmed the AD9834 with PIC microcontroller. My output is always 600mv, 400hz signal whatever value is wriiten to the AD9834. What can be the problem, reset problem or software problem. If one has done this thing please help me.
 

Re: AD9834 programming

thanks Mr. srizbf for repling. I got some useful infomations from the site you have given. Still I could not rectify the problem. my attachment contain the program written in PIC CCS compiler.
 

Hi

Make a simple test to check whether the SPI connection with the 9834 is working

Find a scratch register ( a register that you can read and from and write to )

Write the value 0x55 and read it back

Do the same for the value 0xAA

Whether you pass the test - your SPI link is working well and you have a setup problem

Whether you did not pass the test - check the SPI hardware and software (driver)

All the best

Bobi

The microcontroller specialist
 

My faulty is with PCB or IC since I was able to generate output with diffrent PCB.

Now I have these questions

1. At high frequenies(1MHz) waveform has lot of noises. See Attachment. What is the reason for this. How can this avoid.
2. At low frequency noise some what less still waveform is not sharp.
3. Out put voltage is 100mV ac. is it acceptable
4. At 2MHz waveform completely attenuate. I cannot go beyond 2Mhz. I use 5MHz crystal.

If one know the answer for these questions please help me.
 

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