--- WH Tan <whsiung.my@gmail.com> wrote:
> Basically I am doing some kind of 'instrumentation'
> application...  I
> want to generate audio range sine wave, which will
> be fed to a DUT
> (device under test).  Initially I have put all those
> requirement
> together:
> 
> 1) Output freq can be configured by software (not a
> requirement but
> would nice to have, isn't it?)
> 2) Amplitude can be configured by software
> 3) Distortion should be less then 2%

You can do DDS(direct digital synthesis) with a PIC or
similar micro but you will need to add a D/A
converter. There are also dedicated DDS chips but they
tend to be pricey since they usually even the simplest
of them are for RF. As I recall some that I played
with from Analog Devices were in the $10-15 range.

Cheerful regards,

Bob

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