WM9712CLGEFLSLASHV datasheet(37/78 Pages) WOLFSON

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WM9712L

PD, Rev 4.6, November 2011

VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION

By using an AC’97 Rev2.2 compliant audio interface, the WM9712L can record and playback at all

commonly used audio sample rates, and offer full split-rate support (i.e. the DAC, ADC and AUXDAC

sample rates are completely independent of each other – any combination is possible).

The default sample rate is 48kHz. If the VRA bit in register 2Ah is set and the appropriate block is

enabled, then other sample rates can be selected by writing to registers 2Ch, 32h and 2Eh. The AC-

Link continues to run at 48k frames per second irrespective of the sample rate selected. However, if

the sample rate is less than 48kHz, then some frames do not carry an audio sample.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2Ah

Extended

Audio

Stat/Ctrl

VRA

0 (OFF)

Variable Rate Audio

0: OFF (DAC and ADC run at 48kHz)

1: ON (sample rates determined by

registers 2Ch, 2Eh and 32h)

2Ch

Audio DAC

Sample Rate

15:0

DACSR

BB80h

(48kHz)

Audio DAC sample rate

1F40h: 8kHz

2B11h: 11.025kHz

2EE0h: 12kHz

3E80h: 16kHz

5622h: 22.05kHz

5DC0h: 24kHz

7D00h: 32kHz

AC44h: 44.1kHz

BB80h: 48kHz

Any other value defaults to the nearest

supported sample rate

32h

Audio ADC

Sample Rate

15:0

ADCSR

BB80h

(48kHz)

Audio ADC sample rate

similar to DACSR

2Eh

AUXDAC

Sample Rate

15:0

AUXDA

CSR

BB80h

(48kHz)

AUXDAC sample rate

similar to DACSR

Table 24 Audio Sample Rate Control

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