WM8903 datasheet(144/178 Pages) WOLFSON

144 / 178 page

WM8903

Production Data

PD, Rev 4.5, June 2012

144

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

11 = 48kHz sample rate

DAC_OSR

DAC Oversampling Control

0 = Low power (normal oversample)

1 = High performance (double rate)

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R36 (24h)

ADC Digital

Volume Left

ADCVU

ADC Volume Update

Writing a 1 to this bit causes left and right ADC

volume to be updated simultaneously

(Write-Only Register)

7:0

ADCL_VOL

[7:0]

1100_0000 Left ADC Digital Volume

00h = Mute

01h = -71.625dB

02h = -71.250dB

… (0.375dB steps)

C0h = 0dB

… (0.375dB steps)

EFh = +17.625dB

F0h to FFh = +17.625dB

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R37 (25h)

ADC Digital

Volume Right

ADCVU

ADC Volume Update

Writing a 1 to this bit causes left and right ADC

volume to be updated simultaneously

(Write-Only Register)

7:0

ADCR_VOL

[7:0]

1100_0000 Right ADC Digital Volume

00h = Mute

01h = -71.625dB

02h = -71.250dB

… (0.375dB steps)

C0h = 0dB

… (0.375dB steps)

EFh = +17.625dB

F0h to FFh = +17.625dB

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R38 (26h)

ADC Digital

6:5

ADC_HPF_CUT

[1:0]

ADC Digital High Pass Filter Cut-Off Frequency

(fc)

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

01 = Voice mode 1 (fc=127Hz at fs=16kHz)

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

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

(Note: fc scales with sample rate fs.)

WM8903 Datasheet(PDF) 144 Page - Wolfson Microelectronics plc

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