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
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
Attachments
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
Take a look on the configuration i use for PCM2706.
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An externally hosted image should be here but it was not working when we last tested it.
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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???
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??
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....
Attachments
Successsssss!!!!!!!!!!!
I am able to get the PCM detected..
All the pull ups which were given to 5V were given to 3.3V.. I used a 5 to 3.3V regulator and it worked...
It detects as an USB Audio device...
This comes up in the Control Panel => Sounds and devices..
But when i connect my I2S output lines to a Transmitter which has the I2S inputs m not able to receive any audio...
Is there anyway i can verify that audio is been streamed through PCM???
I am able to get the PCM detected..
All the pull ups which were given to 5V were given to 3.3V.. I used a 5 to 3.3V regulator and it worked...
It detects as an USB Audio device...
This comes up in the Control Panel => Sounds and devices..
But when i connect my I2S output lines to a Transmitter which has the I2S inputs m not able to receive any audio...
Is there anyway i can verify that audio is been streamed through PCM???
I cant name it but it has I2S , analog and SPDIF inputs.. Atleast i i can verify that the analog out is working then it would be fine i think..What exactly is this 'transmitter' you are using ?
Yes i want to do this , what all changes should i make... is only VoutR and VoutL enough??? should i pull up all the Vcc R,L,P to 3.3V???But you might want to test if your chip's analog outputs are working.
When i connect my module to USB port , it is detected as a USB Audio device and falls under " Sound, video and game controllers " in the device manager..
I checked the Frequency on I2S lines ,
SCLK = 12.20 to 12.31 MHz
LRCLK = 48 KHz
Bit CLK = 2.8 MHz
Is there anywhere i am wrong , please do correct me...
I checked the Frequency on I2S lines ,
SCLK = 12.20 to 12.31 MHz
LRCLK = 48 KHz
Bit CLK = 2.8 MHz
Is there anywhere i am wrong , please do correct me...
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