WM8533 datasheet(23/41 Pages) WOLFSON

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Production Data

WM8533

PD, July 2012, Rev 4.0

DIGITAL AUDIO DATA SAMPLING RATES

The external master clock is applied directly to the MCLK input pin. In a system where there are a

number of possible sources for the reference clock, it is recommended that the clock source with the

lowest jitter be used for the master clock to optimise the performance of the WM8533.

In slave mode the WM8533 has a detection circuit that automatically determines the relationship

between the master clock frequency (MCLK) and the sampling rate (LRCLK), to within ±32 system

clock periods. The MCLK must be synchronised with the LRCLK, although the device is tolerant of

phase variations or jitter on the MCLK.

If the device is configured in slave mode using auto-detect or in hardware mode, and during sample

rate change the ratio between MCLK and LRCLK varies more than once within 1026 LRCLK periods,

then it is recommended that the device be taken into the standby state or the off state before the

sample rate change and held in standby until the sample rate change is complete. This will ensure

correct operation of the detection circuit on the return to the enabled state. For details on the standby

state, please refer to the “Software Control Interface” (software mode, page 15) and “Power Up and

Down Control In Hardware Mode” sections of the datasheet (hardware mode, on page 29).

The DAC supports MCLK to LRCLK ratios of 128fs to 1152fs and sampling rates of 8kHz to 192kHz,

provided the internal signal processing of the DAC is programmed to operate at the correct rate.

Table 11 shows typical master clock frequencies and sampling rates supported by the WM8533 DAC.

SAMPLE RATE

(LRCLK)

MASTER CLOCK (MCLK) FREQUENCY (MHz)

128fs

192fs

256fs

384fs

512fs

768fs

1152fs

8kHz

Unavailable

2.048

3.072

4.096

6.144

9.216

32kHz

Unavailable

8.192

12.288

16.384

24.576

36.864

44.1kHz

Unavailable

11.2896

16.9344

22.5792

33.8688

Unavailable

48kHz

Unavailable

12.288

18.432

24.576

36.864

Unavailable

88.2kHz

11.2896

16.9344

22.5792

33.8688

Unavailable

96kHz

12.288

18.432

24.576

36.864

Unavailable

176.4kHz

22.5792

33.8688

Unavailable

192kHz

24.576

36.864

Unavailable

Table 11 MCLK Frequencies and Audio Sample Rates

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