PCM4204PAPR datasheet(17/38 Pages) TI1

17 / 38 page

PCM4204

SBAS327A − JUNE 2004 − REVISED 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

Table 5. Sampling Mode Selection for DSD Input

Mode Operation

FS2

FS1

FS0

SAMPLING MODE

Reserved

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 PCM4204 supports 24-bit

linear PCM output data, as well as 1-bit DSD output data.

The available data formats are dependent upon whether

the PCM4204 is configured in Slave or Master mode. The

S/M (pin 17), FMT0 (pin 18), FMT1 (pin 19), and FMT2 (pin

20) 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 word 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. Time division

multiplexed (TDM) data formats are also supported,

allowing up to two PCM4204 devices to be cascaded on

a single audio serial bus. Table 6 summarizes the

corresponding Slave mode data format selections.

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). For the DSD

data and clock pins (DSD1, DSD2, DSD3, DSD4, and

DSDCLK), they may be configured as either inputs or

outputs, depending upon the DSD format selection. Table

7 summarizes the corresponding Master mode data format

selections.

Figure 3, Figure 4, and Figure 5 illustrate the PCM and

DSD data formats supported by the PCM4204.

Table 6. Slave Mode Audio Data Format Selection

S/M

FMT2

FMT1

FMT0

AUDIO DATA FORMAT

24-bit Left-Justified

24-bit I2S

24-bit Right-Justified

TDM with No BCK Delay for

Start of Frame

TDM with One BCK Delay for

Start of Frame

Reserved

Table 7. Master Mode Audio Data Format

Selection

S/M

FMT2

FMT1

FMT0

AUDIO DATA FORMAT

24-bit Left-Justified

24-bit I2S

24-bit Right-Justified

DSD Output with PCM Output

Disabled

DSD Input with 24−Bit Right-

Justified PCM Output

Reserved

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