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dir9001 problems
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Old 22nd January 2012, 08:35 AM   #11
hanzibal is offline hanzibal  Sweden
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Thank you, the first schematic is new to me so I tried that without any luck though. The second is from the datasheet which I based my own schematic on.

Regretfully, it seems I'm facing bad soldering or a broken chip. I soldered @ approx 350 celcius and afterwards I noticed from specs that the chip can withstand a max of 260 for 5 seconds...

Thanks for all your help guys!
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Old 22nd January 2012, 08:42 AM   #12
JensH is offline JensH  Denmark
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dir9001 problems
On your schematic it looks like C1 is shorted, but I assume that that is not the case.
You don't describe what the distance is from your supply to the IC, but I strongly suggest to add bypass capacitors on the supply pins. Preferably very close to the IC.
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Old 22nd January 2012, 01:23 PM   #13
hanzibal is offline hanzibal  Sweden
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Thanks for your input. In reality C1 isn't shortened but it is in the schematics, I'll fix that.
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Old 22nd January 2012, 03:48 PM   #14
SoNic_real_one is offline SoNic_real_one  United States
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Yep, temperature can kill your chip... Use a good low-temperature solder and use 365F temperature - the chip won't get hot if you limit the exposure time and quantity of solder.
For desoldering I use this.
The 63/37 ratio, known as eutectic solder has practically no plastic range, and melts almost instantly at 183C (361F).

Last edited by SoNic_real_one; 22nd January 2012 at 03:52 PM.
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Old 4th January 2013, 05:16 AM   #15
wmincy is offline wmincy  Malaysia
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hi hanzibal,

did you fix the problem? does your DIR9001 work?

I'm a having quite the same problem... error = 1
I checked the signal at RXin with the oscilloscope and there was nothing wrong, yet there are no signals at LRCK, BCK, SCK...
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Old 4th January 2013, 10:15 AM   #16
hanzibal is offline hanzibal  Sweden
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Quote:
Originally Posted by wmincy View Post
hi hanzibal,

did you fix the problem? does your DIR9001 work?

I'm a having quite the same problem... error = 1
I checked the signal at RXin with the oscilloscope and there was nothing wrong, yet there are no signals at LRCK, BCK, SCK...
Sadly not so i put that project on hold in favor of others. The chip is fairly easy to work with so in retrospect, I think my soldering was bad, i.e. I overheated the chip while soldering.

I'll be taking the project up again as I will be needing an SP/DIF receiver for upcoming projects. Don't know exactly when this will happen though.

As for your problem, it could still be unsupported input format. AFAIK, the chip only accepts regular PCM audio @ 96kHz max. That is, not any of the many encoded/compressed or multi-channel formats (like DTS and similar).

If I remember correctly there's an error pin out that you could check.

Hope this helps.
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Old 3rd January 2017, 04:27 PM   #17
JanErik is offline JanErik  Finland
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Same problem here, feeding the chip a nice TTL signal and still the ERROR pin is high.
Wired according to this: 24-Bit 192KHz PCM1793 DAC with DIR9001 Receiver and OPA2134 OPAMP
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Old 3rd January 2017, 04:42 PM   #18
JanErik is offline JanErik  Finland
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Sometimes it seems the problem is solved as soon as a post is made... I had omitted the 33R resistor between TTL converter and RXIN, it did smooth out the flanks a bit and now it syncs! Still not soldered a DAC chip though but the output looks reasonable.
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Old 11th January 2017, 04:44 PM   #19
JanErik is offline JanErik  Finland
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Seems this problem is back after I soldered the coax-TTL circuit on veroboard. Might have less capacitance now compared to breadboard though, anybody knows how sensitive it is? Still on the scope the input signal looks good.

On the FILT pin, the voltage is pretty constant 0.8V, has anybody measured that?

RESET is done from PG output of 3.3V supply, that should be OK? Datasheet says it should be lifted within 100ns of stable supply. Seems most just wire it to supply.
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Old 11th January 2017, 05:58 PM   #20
JanErik is offline JanErik  Finland
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Also: using an old SB Live as source, that should be correct format?
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