Datasheet

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SBAS290B − JULY 2003 − SEPTEMBER 2004
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15
Table 4. Sampling Mode Selection for DSD
Output Mode Operation
FS2 FS1 FS0 SAMPLING MODE
0 0 0 128f
S
DSD Output Rate with f
SCKI
= 768f
S
0 0 1 128f
S
DSD Output Rate with f
SCKI
= 512f
S
0 1 0 128f
S
DSD Output Rate with f
SCKI
= 384f
S
0 1 1 128f
S
DSD Output Rate with f
SCKI
= 256f
S
1 0 0 64f
S
DSD Output Rate with f
SCKI
= 384f
S
1 0 1 64f
S
DSD Output Rate with f
SCKI
= 256f
S
1 1 0 Reserved
1 1 1 Reserved
AUDIO DATA FORMATS
As mentioned previously, the PCM4202 supports 24-bit
linear PCM output data, as well as 1-bit DSD output data.
The available data formats are dependent upon whether
the PCM4202 is configured in Slave or Master mode. The
S/M
(pin 8), FMT0 (pin 6), and FMT1 (pin 7) inputs are
utilized to select either Slave or Master mode and the
corresponding audio data format.
In Slave mode, the PCM bit and left/right clocks (BCK and
LRCK) are configured as input pins. DSD data formats are
not supported in Slave mode. Slave mode supports
commonly used PCM audio data formats, including Left
Justified, Right Justified, and Philips I
2
S.
In Master mode, the PCM bit and left/right clocks (BCK and
LRCK respectively) are configured as output pins, and are
derived from the system clock input (SCKI). Alternatively,
the DSD output data may be provided at the port output.
Table 5 shows the available data format selections.
Figure 3 and Figure 4 illustrate the PCM and DSD data
formats.
Table 5. Audio Data Format Selection
FMT1 FMT0 AUDIO DATA FORMAT
0 0 24-bit Left Justified
0 1 24-bit I
2
S
1 0 24-bit Right Justified
1 1 1-bit DSD (Master Mode Only)
Left Channel
(a) Left Justified Data Format
(b) Right Justified Data Format
Right Channel
LRCKI
BCKI
DATA
MSB LSB LSBMSB
LRCKI
BCKI
DATA
MSB MSB LSBLSB
(c) I
2
SDataFormat
1/f
S
LRCKI
BCKI
DATA
MSB LSB MSB LSB
Figure 3. PCM Data Formats: Left Justified, Right Justified, and Philips I
2
S