PCM1740

13

SBAS128B

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IW0

Audio Data Word Length

IW1

The IW0 and IW1 bits are used to select the data word length for the audio serial interface.

The audio data format is selected using the IIS bit in Register 3.

IW1

IW0

Word Length

0

0

16-bits (default)

0

1

20-bits

1

0

24-bits

1

1

Reserved

PL[3:0]

Analog Output Mode Select

Bits PL[3:0] are used to set the output mode for the analog outputs. Refer to the table below.

PL3

PL2

PL1

PL0

VOUTLVOUTR

Notes

0

0

0

0

Mute

Mute

Mute

0

0

0

1

Left

Mute

0

010Right

Mute

0

0

1

1

(L+R)/2

Mute

0

1

0

0

Mute

Left

0

1

0

1

Left

Left

0

110Right

Left

Reverse

0

1

1

1

(L+R)/2

Left

1

0

0

0

Mute

Right

1

0

0

1

Left

Right

Stereo (default)

1

010Right

Right

1

0

1

1

(L+R)/2

Right

1

1

0

0

Mute

(L+R)/2

1

1

0

1

Left

(L+R)/2

1

110Right

(L+R)/2

1

1

1

1

(L+R)/2

(L+R)/2

Mono

IIS

Audio Data Format

The IIS bit is used to select the audio data format, either Standard Right-Justified or I2S.

IIS = 0

Standard Right Justified (default)

IIS = 1

I2S

LRP

LRCK Polarity

The LRP bit selects the polarity of left/right clock input (LRCK) when using the Standard Right-Justified audio

data format. This bit has no effect when using the I2S audio data format.

LRP = 0

Left Channel when LRCK = High; Right Channel when LRCK = Low (default)

LRP = 1

Left Channel when LRCK = Low; Right Channel when LRCK = High

ATC

Attenuation Mode Control

The ATC bit is used to select independent or common attenuation data for the Left and Right channels.

ATC = 0

Independent: Left Channel uses Register 0 and Right Channel uses Register 1 (default)

ATC = 1

Common: Left and Right Channels both use Register 0

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

Register 3

res

res

res

res

res

0

1

1

SF1

SF0

DSR1

DSR0

SYS

ATC

LRP

IIS