WM8281ECSSLASHR datasheet(184/392 Pages) CIRRUS

184 / 392 page

WM8281

184

Rev 4.0

OUTPUT SIGNAL PATH SAMPLE RATE CONTROL

The output signal paths are derived from the respective output mixers within the WM8281 digital core.

The sample rate for the output signal paths is configured using the OUT_RATE register - see Table

within the “Digital Core” section.

Note that sample rate conversion is required when routing the output signal paths to any signal chain

that is asynchronous and/or configured for a different sample rate.

OUTPUT SIGNAL PATH CONTROL

The SPKCLKn frequency of the PDM output paths (OUT5 and OUT6) is controlled by the respective

OUTn_OSR register, as described in Table 62. When the OUTn_OSR bit is set, the audio

performance is improved, but power consumption is also increased.

Note that the SPKCLKn frequencies noted in Table 62 assume that the SYSCLK frequency is a

multiple of 6.144MHz (SYSCLK_FRAC=0). If the SYSCLK frequency is a multiple of 5.6448MHz

(SYSCLK_FRAC=1), then the SPKCLKn frequencies will be scaled accordingly.

CONDITION

SPKCLKn FREQUENCY

OUTn_OSR = 0

3.072MHz

OUTn_OSR = 1

6.144MHz

Table 62 SPKCLK Frequency

The WM8281 incorporates a stereo Ambient Noise Cancellation (ANC) processor which can provide

noise reduction in many different operating conditions. The noise cancellation signals can be mixed

into any of the output signal paths using the _ANC_SRC registers, as described in Table 63. See

“Ambient Noise Cancellation” for further details of the ANC function.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1040

(0410h)

Output

Path

Config 1L

11:10

OUT1L_ANC_SR

C [1:0]

OUT1L ANC Source Select

00 = Disabled

01 = ANC Left Channel

10 = ANC Right Channel

11 = Reserved

R1044

(0414h)

Output

Path

Config 1R

11:10

OUT1R_ANC_SR

C [1:0]

OUT1R ANC Source Select

00 = Disabled

01 = ANC Left Channel

10 = ANC Right Channel

11 = Reserved

R1048

(0418h)

Output

Path

Config 2L

11:10

OUT2L_ANC_SR

C [1:0]

OUT2L ANC Source Select

00 = Disabled

01 = ANC Left Channel

10 = ANC Right Channel

11 = Reserved

R1052

(041Ch)

Output

Path

Config 2R

11:10

OUT2R_ANC_SR

C [1:0]

OUT2R ANC Source Select

00 = Disabled

01 = ANC Left Channel

10 = ANC Right Channel

11 = Reserved

R1056

(0420h)

Output

Path

Config 3L

11:10

OUT3L_ANC_SR

C [1:0]

OUT3L ANC Source Select

00 = Disabled

01 = ANC Left Channel

10 = ANC Right Channel

11 = Reserved

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