WM8958 datasheet(98/377 Pages) WOLFSON

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WM8958

Pre-Production

PP, August 2012, Rev 3.4

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 AIF1 sample rate. (The AIF1 sample rate is set using

the AIF1_SR register, as described in the “Clocking and Sample Rates” section.) See Table 43 for the

HPF cut-off frequencies at all supported sample rates.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1040 (0410h)

AIF1 ADC1

Filters

14:13

AIF1ADC1_

HPF_CUT

[1:0]

AIF1ADC1 output path (AIF1, Timeslot 0)

Digital HPF cut-off frequency (fc)

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

01 = Voice mode 1 (fc = 64Hz at fs = 8kHz)

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

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

AIF1ADC1L_

HPF

AIF1ADC1 (Left) output path (AIF1, Timeslot

0) Digital HPF Enable

0 = Disabled

1 = Enabled

AIF1ADC1R

_HPF

AIF1ADC1 (Right) output path (AIF1, Timeslot

0) Digital HPF Enable

0 = Disabled

1 = Enabled

R1041 (0411h)

AIF1 ADC2

Filters

14:13

AIF1ADC2_

HPF_CUT

[1:0]

AIF1ADC2 output path (AIF1, Timeslot 1)

Digital HPF cut-off frequency (fc)

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

01 = Voice mode 1 (fc = 64Hz at fs = 8kHz)

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

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

AIF1ADC2L_

HPF

AIF1ADC2 (Left) output path (AIF1, Timeslot

1) Digital HPF Enable

0 = Disabled

1 = Enabled

AIF1ADC2R

_HPF

AIF1ADC2 (Right) output path (AIF1, Timeslot

1) Digital HPF Enable

0 = Disabled

1 = Enabled

Table 42 AIF1 Output Path High Pass Filter

Sample

Frequency

(kHz)

Cut-Off Frequency (Hz) for given value of AIF

nADCn_HPF_CUT

8.000

0.7

130

267

11.025

0.9

178

367

16.000

1.3

127

258

532

22.050

1.9

175

354

733

24.000

2.0

190

386

798

32.000

2.7

253

514

1063

44.100

3.7

348

707

1464

48.000

4.0

379

770

1594

88.200

7.4

696

1414

2928

96.000

8.0

758

1540

3188

Table 43 AIF1 Output Path High Pass Filter Cut-Off Frequencies

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