WM8951L datasheet(26/42 Pages) WOLFSON

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WM8951L

Production Data

PD Rev 4.1 December 2007

Sample rates listed in the following sections are supported.

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

96/88.2kHz

0 = 256fs

1 = 128fs

1 = 384fs

1 = 192fs

0001000

Sampling

Control

5:2

SR[3:0]

0000

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/crystal oscillator is set up according to the desired sample rates of the ADC.

For ADC sampling rates of 8, 32, 48 or 96kHz, MCLK frequencies of either 12.288MHz (256fs) or

18.432MHz (384fs) can be used. For ADC sampling rates of 8, 44.1 or 88.2kHz from MCLK

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

Table 12 should be used to set up the device to work with the various sample rate combinations. For

example if the user wishes to use the WM8951L in normal mode with the ADC sample rate at 48kHz

then the device should be programmed with BOSR = 0, SR3 = 0, SR2 = 0, SR1 = 0 and SR0 = 0 with

a 12.288MHz MCLK or with BOSR = 1, SR3 = 0, SR2 = 0, SR1 = 0 and SR0 = 0 with a 18.432MHz

MCLK. The ADC will then operate with a Digital Filter of type 1, refer to Digital Filter Characteristics

section for an explanation of the different filter types.

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