PCM4202DBR datasheet(15/26 Pages) BURR-BROWN

15 / 26 page

PCM4202

SBAS290B − JULY 2003 − SEPTEMBER 2004

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Table 4. Sampling Mode Selection for DSD

Output Mode Operation

FS2

FS1

FS0

SAMPLING MODE

128fS DSD Output Rate with fSCKI = 768fS

128fS DSD Output Rate with fSCKI = 512fS

128fS DSD Output Rate with fSCKI = 384fS

128fS DSD Output Rate with fSCKI = 256fS

64fS DSD Output Rate with fSCKI = 384fS

64fS DSD Output Rate with fSCKI = 256fS

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 I2S.

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

24-bit Left Justified

24-bit I2S

24-bit Right Justified

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

MSB

LRCKI

BCKI

DATA

MSB

LSB

1/f

LRCKI

BCKI

DATA

MSB

LSB

MSB

LSB

Figure 3. PCM Data Formats: Left Justified, Right Justified, and Philips I2S

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