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| Details for: Burr-Brown / Texas Instruments PCM2902 | Status  |
| ( Stereo Audio Codec With USB Interface and SPDIF I/O Terminal ) | ( Category: Audio ) |
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| User comments | Please login to add comments |
Nick Nick
(ddrog <at> hotmail.com) |
2006-08-16 16:31:51 |
I just registered to answer to "christian lopes"
the post is 2 years old but it is still get hits from
Google!!
The Pcm2902 is a great usb dac! it isn't "high end" but it has good enough sound to cover the needs of someone who wants to hear a couple of songs with descent sound quality!
these results are from a guy's "PCM2902 USB DAC project"
frequency Response, db: +0,15, -0,05
noise level, dbA: -85,5
dynamic range, dbA: 85,0
THD %: 0,0089
IMD+ Noice, %: 0,018
stereo crosstalk, db: -88,9
for the test results he used RMAA.
there are many projects out there with better performances than this! it surely deserves to build it! |
Daniel .
(dani001 <at> hotmail.com) |
2005-02-16 13:31:57 |
Hi, i built the elektor circuit for PCM2902 chip and tried succesfully under windows. On linux, 2.6.9 kernel says this when i plug my board:
usbaudio: registered dsp 14,3
usbaudio: constructing mixer for Terminal 2 type 0x0301
usbaudio: registered mixer 14,0
usbaudio: constructing mixer for Terminal 5 type 0x0101
usbaudio: no mixer controls found for Terminal 5
usb_audio_parsecontrol: usb_audio_state at c1661780
input: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:00:1d.3-2
lsusb output:
Bus 005 Device 009: ID 08bb:2902 Texas Instruments Japan
But /proc/asound/cards says nothing about the card and I can't get the sound recording working (sound-recorder, brec can't finish the recording and they set no samples into the files ).
Thanks in advance for any help given.
Daniel |
christian lopes
(christian.lopes <at> free.fr) |
2004-09-15 23:50:13 |
This circuit 2902 is bull shit, particulary if you try using the S/pdif input, in this case the USB data stream is blocked.
Furthermore this circuit didnt complies with the S/pdif spécification, as he said Cmos 3,3 V Level, when the S/pdif is a 0,5 V pp signal symetrical to ground, just to let you imagine the auxillary circuitry needed to bring the signal to the cmos (?) level.
Concerning the DAC input, it seams to be a little bit noisy (white noise, plus some logical clicks).
I will not recommand this circuit, for the spdif to USb interface netheir as ADC to USB.
Regards
Luis– |
Timo Hoenig
(thoenig <at> gmx.de) |
2004-04-23 16:00:38 |
There is no need for that. Not on my system. I am using the 2902 with linux 2.6/alsa since the beginning of the 2.6 series. I did not have any problems with hid.ko.
-- Timo |
Anonymous Tux
(du_to_abuse <at> kept.secret.now) |
2004-03-21 20:09:05 |
It works with ALSA, but since kernel 2.6.x there is a (minor)
problem: The device also trys to load the hid.ko module
(i guess because of the volume up/down and mute "keys")
which prevents it from working (i dont know why).
Solutions:
a) make hid.ko inaccessible for modprobe
b) patch drivers/usb/input/hid-core.c (insert the vid/pid
to the blacklist)
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