WM8951L datasheet(29/42 Pages) WOLFSON

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Production Data

WM8951

PD Rev 4.1 December 2007

USB MODE SAMPLE RATES

In USB mode the MCLK/crystal oscillator input is 12MHz only.

SAMPLING

RATE

ADC

MCLK

FREQUENCY

SAMPLE

RATE

DIGITAL

FILTER

TYPE

kHz

MHz

BOSR

SR3

SR2

SR1

SR0

12.000

44.1 (Note 2)

12.000

(Note 1)

12.000

88.2 (Note 3)

12.000

Table 15 USB Mode Sample Rate Look-up Table

Notes:

8k not exact, actual = 8.021kHz

44.1k not exact, actual = 44.118kHz

88.1k not exact, actual = 88.235kHz

All other combinations of BOSR and SR[3:0] that are not in the truth table are invalid

The table above can be used to set up the device to work with various sample rate combinations. For

example if the user wishes to use the WM8951L in USB 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.

The ADC will then operate with a Digital Filter of type 0, refer to Digital Filter Characteristics section

for an explanation of the different filter types.

The BOSR bit represents the base over-sampling rate. This is the rate that the WM8951L digital

signal processing is carried out at and the sampling rate will always be a sub-multiple of this. In USB

mode, with BOSR = 0, the base over-sampling rate is defined at 250fs, with BOSR = 1, the base

over-sampling rate is defined at 272fs. This can be used to determine the actual audio sampling rate

produced by the ADC.

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