WM8741GEDSSLASHV datasheet(26/64 Pages) WOLFSON

26 / 64 page

WM8741

Production Data

PD, Rev 4.2, October 2009

In both modes the polarity of LRCLK can be switched using register bit LRP.

8FS MODE SAMPLING RATES

Since the data rate in 8FS mode is much faster than in standard PCM mode, there are restrictions on

the MCLK rate that can be used. Specifically, only 512fs and 768fs modes are permitted restricting

the sample rate to a maximum of 8x48kHz. The master clock should be synchronised with LRCLK,

although the WM8741 is tolerant of phase differences or jitter on this clock.

Unlike in normal PCM mode, the master clock detection circuit does not operate in 8FS mode. The

rate must be manually programmed using the control interface.

SAMPLING

RATE

LRCLK

FREQUENCY

(kHz)

MASTER CLOCK (MCLK)

FREQUENCY (MHz)

8fs

512fs

768fs

32kHz

256

16.384

24.576

44.1kHz

352.8

22.5792

33.8688

48kHz

384

24.576

36.864

Table 12 Typical Relationships between Master Clock Frequency and Sampling Rate in 8FS

Mode

AUDIO INTERFACE DAISY CHAINING

In daisy chain mode the DOUT pin outputs the audio data received on the DIN pin but delayed by two

times the input word length. When this output is connected to the DIN pin of the next device in the

chain, each WM8741 device will simultaneously sample different channel data in the same LRCLK

period. Daisy chaining is only available in DSP audio interface mode and is limited by a maximum

BCLK frequency of 24.576MHz.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 2

08h

DOUT

Daisy Chaining Multiple devices –

multichannel off one PCM feed.

0 = No Output

1 = Output on pin 23.

Table 13 Daisy Chaining Audio Data Output Control

The following diagram illustrates timing for a daisy chain with 2 WM8741 devices.

Figure 21 Audio Interface Daisy Chaining Timing

WM8741GEDS/V 数据表(PDF) 26 Page - Wolfson Microelectronics plc

WM8741GEDS/V 数据表(HTML) 26 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

数据表下载