Texas Instruments SRC4194EVM, User Manual

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Audio Output Ports
3-8
3.4 Audio Output Ports
The SRC4192EVM includes four audio output ports, two each for the SRC A
and SRC B sections of the SRC4194. Each section is provided with an
AES3/SPDIF-compatible output, along with a buffered I/O header. Figure 3−3
illustrates the output port external connections and associated switch settings.
The SRC A section output port selection and Master/Slave mode operation are
configured using switch SW6. The SRC B section output port selection and
Master/Slave mode operation are configured using switch SW8.
The AES OUT A (J3) and AES OUT B (J8) connectors accept 75
Ω
coaxial
cable connections terminated with RCA plugs. The onboard AES3 transmit-
ters (U7 and U17) provide the AES3 encoded data streams for each output.
Both transmitters are configured to accept 24-bit I
2
S-formatted audio data at
sampling rates up to 192kHz. The AES OUT A and B output ports provide a
convenient, standard interface to consumer and professional audio equip-
ment, as well as common audio test systems.
Figure 3−3. Output Port External Connections and Configuration
Switch SW6 or SW8
x_OM/S
LO = DIT CLOCK x
HI = RCKI x
Switch SW6 or SW8
x_OM/S
LO = DIT is Master
HI = DIT is Slave
Switch SW6 or SW8
x_DIT
LO = DIT is Slave Only
HI = See Text Box Below
BCKx
LRCKx
SDOUTx
TDMIx
SCLK
SYNC
SDATA
RCKIx
MCLK M/S
RC
K
Ix
TD
MI
x
SD
OU
T
x
LRCK
x
BC
Kx
NOTE: x = A or B
OUTPUT PORT A (J2)
or
OUTPUT PORT B (J7)
DIT CLOCK A (J4)
or
DIT CLOCK B (J9)
U1
SRC4194IPAG
U7 or U17
DIT4192IPW
From
RCKIx
Source
2
1
Switch SW6 or SW8
x_OM/S
LO = SRC is Slave
HI = SRC is Master