Not sure if this is helpful, but,....
What if you daisy chain 4 HC595 or similar serial - parallel shifters? Each 595 in turn could drive a R-2R ladder or simply jam its 8 bits into a parallel loaded single DAC.
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Re: 4 DAC channels from a single PIC
Not sure if this is helpful, but,....
What if you daisy chain 4 HC595 or similar serial - parallel shifters? Each 595 in turn could drive a R-2R ladder or simply jam its 8 bits into a parallel loaded single DAC.
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Re: 4 DAC channels from a single PIC
Out of curiosity, which PIC has an 8-byte SPI buffer?
/Henrik.
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Re: 4 DAC channels from a single PIC
Jerson: That's a good idea. As long as I can somehow clock the data into the shift register then toggle a line to load the current state into the DAC then that should work perfectly (I will do some reading on this). I can get hold of parallel DACs easier too! Thanks
Henrik: I work with PIC24FJ64GA002/PIC24FJ64GA004 chips. It's possible to fire 9 bytes at the SPI module in one go. The first byte moves straight to the shift register leaving all 8 slots in the FIFO available.
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Re: 4 DAC channels from a single PIC
Ah, that's what I suspected, not an 8-bit PIC. To bad, that could be useful with PBP.
Thanks!
/Henrik.
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Re: 4 DAC channels from a single PIC
One day dream might come true...Originally Posted by HenrikOlsson
Ioannis
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