Problem with connecting PCM2707 to USb - diyAudio
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Old 12th January 2011, 08:30 AM   #1
kiranp is offline kiranp  India
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Default Problem with connecting PCM2707 to USb

Hi,

I have rigged up a circuit which is used for USB to I2s conversion..
I am using PCM2707 IC from Texas instruments...

And i have attached the schematic of my board also.. I am facing problems in making it recognized , meant to say that when i connect the PCB onto USB port.. A message pops up on windows saying USB not recognized...

I dont know what fault is in my Schematic.. I cross checked the wiring , the components many times .. but didn't find any mistakes..

Can anyone please guide me in getting the work done...

Thank you,
Kitty
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Old 13th January 2011, 05:33 AM   #2
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I believe pin 3 (HOST) should have a connection to Vcc.

~Mike
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Old 13th January 2011, 08:11 AM   #3
kiranp is offline kiranp  India
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Quote:
Originally Posted by lakeside View Post
I believe pin 3 (HOST) should have a connection to Vcc.
Some designs have it connected to VCC and some to ground.. I tried both combinations but didnt work
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Old 13th January 2011, 08:59 AM   #4
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Take a look on the configuration i use for PCM2706.

Click the image to open in full size.

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Old 14th January 2011, 04:07 AM   #5
kiranp is offline kiranp  India
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Quote:
Originally Posted by rrrremus View Post
Take a look on the configuration i use for PCM2706.
Thanks for the circuit... But i don find much changes in yours and mine.. Mine is Bus powered and yours is Self powered.

Then you have connected all the Analog Vcc's to 3.3V and i have connected to ground.. I think , this will not be of much concern..

But whats that AND gate doing with that HOST pin???
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Old 14th January 2011, 04:55 AM   #6
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The gate is there to prevent HOST detection while the DAC is powered off; the chip can be configured to run bus-powered.
Does your PCM2707 chip oscillate ? Is your USB connector wired correctly ?
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Old 14th January 2011, 05:11 AM   #7
kiranp is offline kiranp  India
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Quote:
Originally Posted by rrrremus View Post
Does your PCM2707 chip oscillate ? Is your USB connector wired correctly ?
U meant does the 12Mhz oscillate ?? i checked with an CRO for it i got a near 12MHz oscillation..

USB is wired correctly , is there anyway to check whether PCM is dead or working??
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Old 14th January 2011, 05:34 AM   #8
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Yes, i mean if the 12MHz oscillates. The 1M ohm resistor and ~27pF capacitors are critical, the chip will not work without them, even if you see oscillation. Show us a photo of your PCB, maybe we can spot something.
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Old 14th January 2011, 05:59 AM   #9
kiranp is offline kiranp  India
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Quote:
Originally Posted by rrrremus View Post
Yes, i mean if the 12MHz oscillates. The 1M ohm resistor and ~27pF capacitors are critical, the chip will not work without them, even if you see oscillation. Show us a photo of your PCB, maybe we can spot something.
I am onto it as a prototype , so my PCB is still on its way... i have a not so good picture of it , but i don think you will be able to track the lines and all sorry....
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Old 14th January 2011, 06:03 AM   #10
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That looks nasty. Build a PCB for it.
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