Recommended Media Player
www.ti.com
4
Recommended Media Player
The Apple
®
QuickTime
®
media player is recommended to perform listening tests because it does not
initiate or terminate USB communications abruptly as does the Windows Media Player
®
. Abrupt signal
processing could result in a clicking sound on the headphone side. This type of click has been confirmed
to not be related to the TLV320DAC3202 device because no writing or reading of registers occurs during
this period of time to the device under test (DUT).
It is also suggested to not stop or pause the player in the middle of a large audio signal.
Users can download the QuickTime Player from the Apple website at
http://www.apple.com/quicktime/download/
.
5
Performance Testing
In order to evaluate the performance of the TLV320DAC3202, several uncompressed wave files (.wav)
have been developed; each plays for approximately 2 minutes.
gives a description of these files.
Table 1. .WAV Test File Summary
Parameter
48kS/s Files
44.1kS/s Files
Idle Channel Noise
ICN_48kS.wav
ICN_44kS.wav
Dynamic Range
DR_48kS.wav
DR_44kS.wav
Crosstalk
CT_48kS.wav
CT_44kS.wav
0 dBFS THD
FS_48kS.wav
FS_44kS.wav
–3 dBFS THD
M3dBFS_48kS.wav
M3dBFS_44kS.wav
–20 dBFS THD
M20dBFS_48kS.wav
M20dBFS_44kS.wav
These wave files are generated with 24-bit data length and a tone setting of approximately 1-kHz. Simply
double-click on the .wav file and an active system media player opens to play the tone.
These wave files are available for download from the device product folder.
Some performance results captured on an Audio Precision system (AP 2722) with 48-kHz sampling wave
files are shown in
. This type of measurement is done by connecting the 3.5-mm audio jack to the
Audio Precision unbalanced BNC inputs.
Figure 6. AP Performance Testing
6
TLV320DAC3202EVM
SLAU327 – October 2010
Copyright © 2010, Texas Instruments Incorporated