Configuration Control
1-4
1.5.4
PCM Audio/DSD Interface
Connector CN001 allows selection of the audio data interface connection by
jumper settings. In the case of a linear PCM audio data interface between the
DAI receiver and the PCM/DSD1792/1794 DAC, system clock, BCK, LRCK,
DATA and GND should be jumper connected. The MSEL jumper connection
is for the selection of SPI/I
2
C register control on the PCM1792. In the case of
a DSD audio data interface between the DSD decoder LSI and the DSD1792
DAC, DSDL, DSDR, DBCK and system clock should be connected at right side
pins of CN001. The MSEL jumper must be connected (to GND) for SPI mode
operation of the PCM1792.
Figure 1−2. CN001 Connection
Lch ZERO Out/PCM. Lch DATA In/DSD
CN001
Rch ZERO Out/PCM. Rch DATA In/DSD
MSEL/PCM. DBCK In/DSD
System Clock In
GND
BCK In
BCK In for Left-Justified
LRCK In
DATA In
1.5.5
Analog Output Selection
Jumper connections JP-1 through JP-4 are for selection of the analog output
function. Jumper connections JP-1 through JP-4 must all have either pins 1−2
connected or pins 3−4 connected.
-
1−2: 4.5-V rms single-ended output (PJ-2, PJ-4) and 9-V rms balanced
output (CN-M)
J
Cutoff frequency of this analog output circuit is 200 kHz
-
3−4: 2-V rms single-ended output (PJ-1, PJ-3)
J
Cutoff frequency of this second-order active post-LPF analog output
circuit is 70 kHz.
1.5.6
Hardware Control Switches S01−S07
Switches S01−S07 are hardware controls for the PCM1794. S01 is a reset
control for both PCM/DSD1792 and PCM/DSD1794. S02, S03, S05 and S06
are for audio format selection as shown in Table 1−3. Switches S02−S07 must
be set to the N position for the PCM/DSD1792 and DSD1794.
S01
RESET
H: Normal Operation
L: RESET
S02
FMT1
Audio format select
S03
FMT0
Audio format select
