AD1833AST datasheet(12/20 Pages) AD

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AD1833

–12–

2S Timing

2S timing uses an L/

RCLK to define when the data being trans-

mitted is for the left channel and when it is for the right channel.

The L/

RCLK is low for the left channel and high for the right

channel. A bit clock running at 64

× f

S is used to clock in the

data. There is a delay of one bit clock from the time the L/

RCLK

signal changes state to the first bit of data on the SDINx lines.

The data is written MSB first and is valid on the rising edge of

bit clock.

Left Justified Timing

Left Justified (LJ) timing uses an L/

RCLK to define when the

data being transmitted is for the left channel and when it is for

the right channel. The L/

RCLK is high for the left channel and

low for the right channel. A bit clock running at 64

× f

S is used

to clock in the data. The first bit of data appears on the SDINx

lines at the same time the L/

RCLK toggles. The data is written

MSB first and is valid on the rising edge of bit clock.

Right Justified Timing

Right Justified (RJ) timing uses an L/

RCLK to define when the

data being transmitted is for the left channel and when it is for

the right channel. The L/

RCLK is high for the left channel and

low for the right channel. A bit clock running at 64

× fS is used

to clock in the data. The first bit of data appears on the SDINx

8-bit clock periods (for 24-bit data) after L/

RCLK toggles. In RJ

mode the LSB of data is always clocked by the last bit clock

before L/

RCLK transitions. The data is written MSB first and

is valid on the rising edge of bit clock.

LEFT CHANNEL

RIGHT CHANNEL

LSB

MSB

RCLK

INPUT

BCLK

INPUT

SDATA

INPUT

LSB

MSB

–2

MSB

–1

MSB

LSB

MSB

–2

MSB

–1

MSB

Figure 4. I 2S Timing Diagram

LEFT CHANNEL

RIGHT CHANNEL

LSB

RCLK

INPUT

BCLK

INPUT

SDATA

INPUT

LSB

MSB

–2

MSB

–1

MSB

LSB

MSB

–2

MSB

–1

MSB

–1

MSB

Figure 5. Left-Justified Timing Diagram

LEFT CHANNEL

RIGHT CHANNEL

LSB

RCLK

INPUT

BCLK

INPUT

SDATA

INPUT

LSB

MSB

–2

MSB

–1

LSB

MSB

LSB

MSB

–2

MSB

–1

MSB

Figure 6. Right-Justified Timing Diagram

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