WM8994ECSSLASHR datasheet(102/363 Pages) CIRRUS

102 / 363 page

WM8994

102

Rev 4.6

AIF2 - OUTPUT PATH HIGH PASS FILTER

A digital high-pass filter can be enabled in the AIF2 output paths to remove DC offsets. This filter is

enabled independently in the two AIF2 output channels using the register bits described in Table 43.

The HPF cut-off frequency for the AIF2 channels is set using AIF2ADC_HPF_CUT.

In hi-fi mode, the high pass filter is optimised for removing DC offsets without degrading the bass

response and has a cut-off frequency of 3.7Hz when the sample rate (fs) = 44.1kHz.

In voice modes, the high pass filter is optimised for voice communication; it is recommended to set the

cut-off frequency below 300Hz.

Note that the cut-off frequencies scale with the AIF2 sample rate. (The AIF2 sample rate is set using

the AIF2_SR register, as described in the “Clocking and Sample Rates” section.) See Table 37 for the

HPF cut-off frequencies at all supported sample rates.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1296 (0510h)

AIF2 ADC

Filters

14:13

AIF2ADC_H

PF_CUT

[1:0]

AIF2ADC output path Digital HPF Cut-Off

Frequency (fc)

00 = Hi-fi mode (fc = 4Hz at fs = 48kHz)

01 = Voice mode 1 (fc = 127Hz at fs = 8kHz)

10 = Voice mode 2 (fc = 130Hz at fs = 8kHz)

11 = Voice mode 3 (fc = 267Hz at fs = 8kHz)

AIF2ADCL_

HPF

AIF2ADC (Left) output path Digital HPF

Enable

0 = Disabled

1 = Enabled

AIF2ADCR_

HPF

AIF2ADC (Right) output path Digital HPF

Enable

0 = Disabled

1 = Enabled

Table 43 AIF2 Output Path High Pass Filter

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