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WM8706

24-bit, 192kHz Stereo DAC with Volume Control

Wolfson Microelectronics plc 

WM8706

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In left justified, right justified and I2S modes, the minimum number of BCKINs per LRCIN period

is 2 times the selected word length. LRCIN must be high for a minimum of word length BCKINs

and low for a minimum of word length BCKINs. Any mark to space ratio on LRCIN is

acceptable provided the above requirements are met. The WM8706 will automatically detect

when data with a LRCIN period of exactly 32 is sent, and select 16 bit mode - overriding any

previously programmed word length. Word length will revert to the previously programmed

value when a LRCIN period other than 32 is detected. (see Figure 4, Figure 5 and Figure 6).

In DSP early or DSP late mode, the data is time multiplexed onto DIN. LRCIN is used as a

frame sync signal to identify the MSB of the first word. The minimum number of BCKINs per

LRCIN period is 2 times the selected word length. Any mark to space ratio is acceptable on

LRCIN provided the rising edge is correctly positioned (see Figure 7 and Figure 8).

LEFT JUSTIFIED MODE

In left justified mode, the MSB is sampled on the first rising edge of BCKIN following a LRCIN

transition. LRCIN is high during the left samples and low during the right samples.

LRCIN

BCKIN

LEFT CHANNEL

1/fs

RIGHT CHANNEL

DIN

123

MSB

n-2 n-1 n

LSB

123

MSB

n-2 n-1 n

LSB

Figure 4 Left Justified Mode Timing Diagram

RIGHT JUSTIFIED MODE

In right justified mode, the LSB is sampled on the rising edge of BCKIN preceding a LRCIN

transition. LRCIN is high during the left samples and low during the right samples.

LRCIN

BCKIN

1/fs

LEFT CHANNEL

RIGHT CHANNEL

DIN

123

n-2 n-1 n

MSB

LSB

Figure 5 Right Justified Mode Timing Diagram

123

MSB

n-2 n-1 n

LSB

WOLFSON MICROELECTRONICS LTD

PP Rev 1.2 April 2001

10

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