HELP!! pll1700+dir1703+pcm1793 DAC - diyAudio
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Old 12th August 2004, 10:32 AM   #1
kafka is offline kafka  Poland
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Default HELP!! pll1700+dir1703+pcm1793 DAC

As in the subject it just doesn't work. I think it's dir 1703 fault. It behaves very strange. With no SPDIF input attached BRATE0,1 seems to see 96kHz ( should be 48kHz ) and it doesn't change with 44.1 SPDIF input. Maybe there's something wrong with my circut??
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Old 12th August 2004, 10:49 AM   #2
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Funny thing... Now dir1703 see right 48kHz, but then I plug CD-Rom wire ( just plug, not play ) it changes to 98kHz.
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Old 12th August 2004, 11:17 PM   #3
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No one would help me?? I know that some of you have already built something with that chip and can share their experience. Inmy case seems that dir1703 can't lock the incoming SPDIF. Why? Maybe there is a mistake in the schematic??
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Old 13th August 2004, 11:31 PM   #4
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Well my DIR works in a really odd way too. It will only work with a 48khz signal and wont auto lock onto anything else, even though it is set up to auto detect. I would appreciate it if someone would say all the conditions the DIR must be under to actually autodetect the sample frequency.
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Old 14th August 2004, 01:20 PM   #5
kafka is offline kafka  Poland
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I've read that the input chip schould be 74HCU04, cos that's unbuffered version. I've got 74HC04 so far. Maybe that's the problem. I'll try with HCU then I have one.
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Old 14th August 2004, 02:30 PM   #6
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Why are you using a PLL1700 ?
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Old 14th August 2004, 03:18 PM   #7
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Because one device gives me system clock to my DAC, ADC and SPDIF encoder.
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Old 14th August 2004, 03:29 PM   #8
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Quote:
Originally posted by kafka
Because one device gives me system clock to my DAC, ADC and SPDIF encoder.
No it doesnt...
Your only supplying the DIR1703 with a clock... you dont need to since it has its own clock generator.
The PLL1700 is unneeded.

Have a look at the schematic for my last DAC:
http://www.overclockers.com.au/~mwp/...p-dac3-sch.pdf

The PLL1700 is only really needed when you need an easily changed rate clock source for multiple components.
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Old 14th August 2004, 04:07 PM   #9
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Quote:
Originally posted by MWP

Your only supplying the DIR1703 with a clock
Yes... but I've attached only a part of a whole schematic with pcm1804 and dit4096. The truth is that so far nothing works
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Old 14th August 2004, 06:23 PM   #10
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Quote:
Originally posted by kafka
Yes... but I've attached only a part of a whole schematic with pcm1804 and dit4096. The truth is that so far nothing works
Oh, i see
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