www.ti.com
5.2
Master Mode with Audio Precision SYS-2722
SCKI
BCK
LRCK
DOUT
DIN
DAC
DIR:LC89052T
ADC
PCM3793A
Daughter card #2
Daughter card #1
DIT: DIT4096
U302
CN302
U301
CN301
SW301
SW001
Clock
Manager
AudioInterface
Isolated by
CN305
Master Mode with Audio Precision SYS-2722
To enable the DEM-DAI3793A/3794A EVM motherboard for use in Master mode, the path of the S/PDIF
input to the PCM3793A through DIR is not available for use. LRCK and BCK change the respective output
states at the PCM3793A side in master mode; the respective jumpers of R-BCK, R-LRCK, and RX-DATA
should be removed from CN305 to avoid conflict between the input and output of these clocks.
Furthermore, in this situation, DIN to the PCM3793A is also invalid because DIR LC89052T does not
receive clocks (LC89052T cannot work in slave mode). Therefore, any analog output from the DAC is
invalid because there is no data input.
However, in this configuration, users can confirm master mode operation of both LRCK and BCK from
PCM3793A with a digital oscilloscope. Users can easily identify master mode without the use of other
external equipment such as the PSIA-2722 analyzer.
The PCM3793A has no integrated internal PLL. However, the clock manager function can provide LRCK
(f
S
) and BCK in master mode, as described in
Figure 5-3
.
Figure 5-3. Master Mode Configuration With SYS-2722
Refer to the jumper combination shown in
Figure 5-4
to put the DEM-DAI3793A/3794A EVM motherboard
into master mode configuration.
52
Evaluation and Measurements
SBAU127 – July 2007
Submit Documentation Feedback
Содержание DEM-DAI3793A
Страница 1: ...DEM DAI3793A 3794A EVM User s Guide July 2007 AIP Consumer Audio TI Japan SBAU127...
Страница 2: ...2 SBAU127 July 2007 Submit Documentation Feedback...
Страница 16: ...Description 16 SBAU127 July 2007 Submit Documentation Feedback...
Страница 72: ...Schematic PCB Layout and Bill of Materials 72 SBAU127 July 2007 Submit Documentation Feedback...