HELP!! pll1700+dir1703+pcm1793 DAC - Page 2

kafka · 21st September 2004, 08:45 PM

!@$!#$#%@!#$%@#%&%&$^$

It was all the PLL1700 fault !! It works without it. Now I'm going to force PLL to work properly.

apollyon25 · 22nd September 2004, 01:46 AM

Hi Kafka,

I designed a similar system to the one you are discribing. BTW Check the TI site for the newer version of the PLL1700 clock gen device.

The reason to use this over connecting the SCK out from the DIR straight into the SCK in on the DAC is this limits you to only using the default oversampling rate.

Sourcing all local clocks from a centralised clock point improves jitter performance considerably. It also provides flexibility with oversampling rates, and allows the designer to maximise the performance of the system.

Good luck with it
apollyon25

kafka · 28th September 2004, 09:43 AM

All that work just to find out that the PLL1700 was broken. I've replaced it and the DAC works well... almost... one channel is louder then another. Resistors in the analog stage are matched to 0.1%. Where can I search for the mistake?

22nd September 2004, 01:46 AM	#12
apollyon25 diyAudio Member Join Date: Sep 2004 Location: Auckland, NZ	PLL1700 Hi Kafka, I designed a similar system to the one you are discribing. BTW Check the TI site for the newer version of the PLL1700 clock gen device. The reason to use this over connecting the SCK out from the DIR straight into the SCK in on the DAC is this limits you to only using the default oversampling rate. Sourcing all local clocks from a centralised clock point improves jitter performance considerably. It also provides flexibility with oversampling rates, and allows the designer to maximise the performance of the system. Good luck with it apollyon25

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21st September 2004, 08:45 PM	#11
kafka diyAudio Member Join Date: Jun 2004 Location: Lublin	!@$!#$#%@!#$%@#%&%&$^$ It was all the PLL1700 fault !! It works without it. Now I'm going to force PLL to work properly.

28th September 2004, 09:43 AM	#13
kafka diyAudio Member Join Date: Jun 2004 Location: Lublin	All that work just to find out that the PLL1700 was broken. I've replaced it and the DAC works well... almost... one channel is louder then another. Resistors in the analog stage are matched to 0.1%. Where can I search for the mistake?

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