WM8994ECSSLASHR datasheet(96/363 Pages) CIRRUS

96 / 363 page

WM8994

Rev 4.6

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 37 AIF1 Output Path High Pass Filter Cut-Off Frequencies

AIF1 - INPUT PATH VOLUME CONTROL

The AIF1 interface supports up to four input channels. A digital volume control is provided on each of

these input signal paths, allowing attenuation in the range -71.625dB to 0dB in 0.375dB steps. The

level of attenuation for an eight-bit code X is given by:

0.375

 (X-192) dB for 1  X  192;

MUTE for X = 0

0dB for 192

 X  255

The AIF1DAC1_VU and AIF1DAC2_VU bits control the loading of digital volume control data. When

the volume update bit is set to 0, the associated volume control data will be loaded into the respective

control register, but will not actually change the digital gain setting.

The AIF1DAC1L and AIF1DAC1R gain settings are updated when a 1 is written to AIF1DAC1_VU.

The AIF1DAC2L and AIF1DAC2R gain settings are updated when a 1 is written to AIF1DAC2_VU.

This makes it possible to update the gain of left and right channels simultaneously.

Note that a digital gain function is also available at the audio interface input, to boost the DAC volume

when a small signal is received on DACDAT1. See “Digital Audio Interface Control” for further details.

Digital volume control is also possible at the DAC stage of the signal path, after the audio signal has

passed through

the DAC digital mixers. See “Digital to Analogue Converter (DAC)” for further details.

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