WM8711SEDSSLASHR datasheet(30/47 Pages) WOLFSON

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Production Data

WM8711 / WM8711L

PD Rev 4.3 September 2006

AUDIO DATA SAMPLING RATES

The WM8711/L provides for two modes of operation (normal and USB) to generate the required DAC

sampling rates. Normal and USB modes are programmed under software control according to the

table below.

In Normal mode, the user controls the sample rate by using an appropriate MCLK frequency and the

sample rate control register setting. The WM8711/L can support sample rates from 8ks/s up to

96ks/s.

In USB mode, the user must use a fixed MLCK frequency of 12MHz to generate sample rates from

8ks/s to 96ks/s. It is called USB mode since the common USB (Universal Serial Bus) clock is at

12MHz and the WM8711/L can be directly used within such systems. WM8711/L can generate all the

normal audio sample rates from this one Master Clock frequency, removing the need for different

master clocks or PLL circuits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

USB/

NORMAL

Mode Select

1 = USB mode (250/272fs)

0 = Normal mode (256/384fs)

BOSR

Base Over-Sampling Rate

USB Mode

0 = 250fs

1 = 272fs

Normal Mode

96/88.2 kHz

0 = 256fs

0 = 128fs

1 = 384fs

1 = 192fs

0001000

Sampling

Control

5:2

SR[3:0]

0000

DAC sample rate control;

See USB Mode and Normal Mode

Sample Rate sections for operation

Table 11 Sample Rate Control

NORMAL MODE SAMPLE RATES

In normal mode MCLK is set up according to the desired sample rates of the DAC. For DAC sampling

rates of 8, 32, 48 or 96kHz, MCLK frequencies of either 12.288MHz (256fs) or 18.432MHz (384fs)

can be used. DAC sampling rates of 8, 44.1 or 88.2kHz from MCLK frequencies of either

11.2896MHz (256fs) or 16.9344MHz (384fs) can be used.

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