WM8945ECSSLASHR datasheet(33/169 Pages) WOLFSON

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Production Data

WM8945

PD, May 2011, Rev 4.1

Record mode enables the entire set of Signal Enhancement functions in the ADC 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 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 = Reserved

0011 = Reserved

Table 12 DSP Configuration Mode Select

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

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 filter is enabled using the SE1_LHPF_L_ENA register bit defined in

Table 13. For the derivation of the other associated registers, refer to the configuration tools supplied

with the WM8945 Evaluation Kit.

Example plots of the Low-pass / High-pass filter response are shown in Figure 14.

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 14 Low-pass / High-pass Filter Responses

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