CS47L85 datasheet(208/370 Pages) CIRRUS

208 / 370 page

CS47L85

208

Rev 4.3

OUTPUT SIGNAL PATH SAMPLE RATE CONTROL

The output signal paths are derived from the respective output mixers within the CS47L85 digital core. The sample rate for

the output signal paths is configured using the OUT_RATE register - see Table 22

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 72. 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 72 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 72 SPKCLK Frequency

The CS47L85 incorporates a mono Ambient Noise Cancellation (ANC) processor which can provide noise reduction in many

different operating conditions. The noise cancellation signal can be mixed into any of the output signal paths using the

_ANC_SRC registers, as described in Table 73.

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

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1040

(0410h)

Output_Pa

th_Config_

11:10

OUT1L_ANC_SR

C [1:0]

OUT1L ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1044

(0414h)

Output_Pa

th_Config_

11:10

OUT1R_ANC_SR

C [1:0]

OUT1R ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1048

(0418h)

Output_Pa

th_Config_

11:10

OUT2L_ANC_SR

C [1:0]

OUT2L ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1052

(041Ch)

Output_Pa

th_Config_

11:10

OUT2R_ANC_SR

C [1:0]

OUT2R ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1056

(0420h)

Output_Pa

th_Config_

11:10

OUT3L_ANC_SR

C [1:0]

OUT3L ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1060

(0424h)

Output_Pa

th_Config_

11:10

OUT3R_ANC_SR

C [1:0]

OUT3R ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

R1064

(0428h)

Output_Pa

th_Config_

11:10

OUT4L_ANC_SR

C [1:0]

OUT4L ANC Source Select

00 = Disabled

01 = Enabled

All other codes are Reserved

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