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Old 19th September 2006, 06:52 AM   #1
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Default USB controller problems on DAC?

I have a DDDAC board that has a PCM2707PJT and I am using the built in D/A converter. My usb part stop being reconized. If I plug it in the icon comes up but says unrecognized device. If this happnes again, replace device. In advice on what I can do. Thanks.
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Old 19th September 2006, 08:52 PM   #2
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Anybode no anything about the PCM2707 controller. Why it would malfucntion like this?
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Old 19th September 2006, 09:36 PM   #3
jkeny is offline jkeny  Ireland
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Did it work at one time? This seems to be a problem with this chip. Do a search on this forum for PCM2706/7 to see posts about this.

John
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Old 19th September 2006, 10:16 PM   #4
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Default check this too ...

http://focus.ti.com/docs/prod/folder...t/pcm2707.html

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Old 20th September 2006, 12:14 AM   #5
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Thanks. I noticed something. I don't get any voltage on Vcom. Should I get voltage here? I don't get 3.3V either unless I plug in external power from battery. I get like 2.6V.
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Old 20th September 2006, 06:13 AM   #6
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What exactly is Vcom for? I have been reading over the data sheet and it says analog input voltage. Is this correct. It has VoutL and VoutR under analog input voltage.
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Old 20th September 2006, 02:10 PM   #7
jkeny is offline jkeny  Ireland
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Yes you should get 3.3V on Vcom AFAIK. I think it is the PS for analogue out. What do you mean you have to plug in external power? Are u not powering this off uSB - if not give us the details.

JOhn
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Old 20th September 2006, 02:26 PM   #8
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Here is a schematic. Ended up showing up really crappy because resizing. I will post elsewhere later.
Attached Images
File Type: gif usb-circuit1.gif (25.0 KB, 330 views)
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Old 20th September 2006, 03:33 PM   #9
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Default no connect?

... VCOM shows not connected in your drawing ...

No idea what it is for without careful examination of chip specs, etc. ...
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Old 20th September 2006, 04:58 PM   #10
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That was bad when I tried to reduce it to meat the specifications of 1000X1000 the pixels got messed up. Here is the photo :

Click the image to open in full size.
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