WM8944BECSSLASHR datasheet(32/165 Pages) CIRRUS

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WM8944B

Rev 4.3

Record mode enables the entire set of Signal Enhancement functions in the ADC / Digital Microphone

path. The direct DAC path is also active, without any Signal Enhancement functions; this allows basic

audio playback and digital beep generation.

Playback mode enables the entire set of DSP functions in the DAC path. The direct ADC / Digital

Microphone path is also active, without any DSP functions; this allows basic audio record functions to

the host system.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R64 (40h)

SE Config

Selection

3:0

SE_CONFIG

[3:0]

0000

DSP Configuration Mode select

0000 = Record mode

0001 = Playback mode

0010 = DSP General mode 1

0011 = DSP General mode 2

Table 12 DSP Configuration Mode Select

LOW-PASS / HIGH-PASS FILTER (LPF/HPF)

3D surround

5-notch filter

DF1 filter

L/HPF

Signal Enhancement Block 1 (SE1)

The Low-pass / High-pass filter is part of the SE1 block. This first-order filter can be configured to be

high-pass, low-pass; it can also be bypassed. The cut-off frequency is programmable; the default

setting is bypass (OFF).

The filters are enabled using the SE1_LHPF_L_ENA and SE1_LHPF_R_ENA register bits defined in

Table 13.

The 3D enhancement coefficients are programmed in registers R65 to R67. For the derivation of

these registers, refer to the configuration tools supplied with the WM8944B Evaluation Kit.

Example plots of the Low-pass / High-pass filter response are shown in Figure 12.

1kLPF.res Magnitude(dB)

1kHPF.res Magnitude(dB)

5kLPF.res Magnitude(dB)

5kHPF.res Magnitude(dB)

200LPF.res Magnitude(dB)

200HPF.res Magnitude(dB)

39.91

79.62

158.9

317

632.5

1.262k

2.518k

5.024k

10.02k

20k

-27

-24

-21

-18

-15

-12

-9

-6

-3

Figure 12 Low-pass / High-pass Filter Responses

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