Datasheet

2.2 Inter-Channel Phase Difference
2.3 Exceeding Max-Packet Size
Problems, Restrictions, Workaround www.ti.com
Problems
The PCM290X has delay of 1 sample at each channels as follows:
• Up-stream data from ADC, S/PDIF in : Rch data delay (1 sample)
• Down-stream data to DAC, S/PDIF out : Lch data delay (1 sample)
Restrictions
Recording or playback of general audio or S/PDIF In/Out of Linear PCM, makes minimal difference to
the listener. However, the critical application for the inter-channel phase difference, data transfer
between USB and S/PDIF In/Out, can not be used.
Workaround
If the inter-channel difference is not allowed, the user must solve this problem in the application
software. It is not possible to solve this problem by any modification of external circuit.
TI is considering corrections to solve the problem, and will notify the user when a solution is
determined.
Take care to note the problems listed in this document when considering the use of these products for
new projects.
Problems
Pop noise at irregular timing, intermittent continuous noise, or L/R Channel Inverse during recording
has been observed.
TI has already confirmed that the root cause of these problems is from the data sent over the "Max
Packet Size" defined by the descriptor contents.
Occurance of the problem is most likely to happen between several hours and several days,
depending on the environment.
Restrictions
TI acknowledged three types of problems and conditions classified as:
1. Pop noise at irregular timing : Under Windows XP/Vista, and Mac OS X
2. Intermittent continuous noise : Under Mac OS X V10.5
3. L/R inverse : Under Windows XP/Vista
Workaround
A specific solution/workaround has not been identified by any external circuit modification or change in
the software/register settings. However, reducing the common mode noise to the products has some
effect of reducing the frequency of occurrence. A solution is planned through a fix in the next silicon
revision. Samples are planed to be released during 2008.
For further questions, contact to Consumer Audio Products, Product Marketing group at
Telephone : [phone]
Email : [e-mail]
2 PCM290x Errata SLAZ036A – April 2007 – Revised May 2008
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