WM8912 datasheet(56/128 Pages) WOLFSON

Part #	WM8912

Description	Ultra Low Power DAC with Headphone Driver for Portable Audio Applications

PDF	128 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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56 / 128 page

WM8912

Production Data

PD, Rev 4.0, September 2010

n-1

n-2

n-1

n-2

LEFT CHANNEL

RIGHT CHANNEL

MSB

LSB

Input Word Length (WL)

1/fs

LRCLK

BCLK

DACDAT

1 BCLK

Figure 32 I2S Justified Audio Interface (assuming n-bit word length)

In DSP mode, the left channel MSB is available on either the 1st (mode B) or 2nd (mode A) rising

edge of BCLK (selectable by AIF_LRCLK_INV) following a rising edge of LRCLK. Right channel data

immediately follows left channel data. Depending on word length, BCLK frequency and sample rate,

there may be unused BCLK cycles between the LSB of the right channel data and the next sample.

In device master mode, the LRC output will resemble the frame pulse shown in Figure 33 and Figure

34. In device slave mode, Figure 35 and Figure 36, it is possible to use any length of frame pulse

less than 1/fs, providing the falling edge of the frame pulse occurs greater than one BCLK period

before the rising edge of the next frame pulse.

Figure 33 DSP Mode Audio Interface (mode A, AIF_LRCLK_INV=0, Master)

Figure 34 DSP Mode Audio Interface (mode B, AIF_LRCLK_INV=1, Master)

WM8912 Datasheet(PDF) 56 Page - Wolfson Microelectronics plc