WM8903 datasheet(55/178 Pages) WOLFSON

55 / 178 page

Production Data

WM8903

PD, Rev 4.5, June 2012

The digital interface volume is controlled as shown in Table 26.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24 (18h)

Audio

Interface 0

10:9

DAC_BOOST

[1:0]

DAC Input Volume Boost

00 = 0dB

01 = +6dB (Input data must not

exceed -6dBFS)

10 = +12dB (Input data must not

exceed -12dBFS)

11 = +18dB (Input data must not

exceed -18dBFS)

Table 26 DAC Interface Volume Boost

DIGITAL SIDETONE

Digital sidetone mixing (from ADC output into DAC input) is available when ADCs and DACs are

operating at the same sample rate. Digital data from either left or right ADC can be mixed with the

audio interface data on the left and right DAC channels. Sidetone data is taken from the ADC

high-pass filter output, to reduce low frequency noise in the sidetone (e.g. wind noise or mechanical

vibration).

When using the digital sidetone, it is recommended that the ADCs are enabled before un-muting the

DACs to prevent pop noise. The DAC volumes and sidetone volumes should be set to an appropriate

level to avoid clipping at the DAC input.

When digital sidetone is used, it is recommended that the Charge Pump operates in Register Control

mode only (CP_DYN_PWR = 0). See “Charge Pump” for details.

The digital sidetone is controlled as shown in Table 27.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R32 (20h)

DAC Digital 0

11:8

ADCL_DAC_SV

OL [3:0]

0000

Left Digital Sidetone Volume

0000 = -36dB

0001 = -33dB

(… 3dB steps)

1011 = -3dB

11XX = 0dB

(See Table 28 for volume range)

7:4

ADCR_DAC_SV

OL [3:0]

0000

Right Digital Sidetone Volume

0000 = -36dB

0001 = -33dB

(… 3dB steps)

1011 = -3dB

11XX = 0dB

(See Table 28 for volume range)

3:2

ADC_TO_DACL

[1:0]

Left DAC Digital Sidetone Source

00 = No sidetone

01 = Left ADC

10 = Right ADC

11 = Reserved

1:0

ADC_TO_DACR

[1:0]

Right DAC Digital Sidetone Source

00 = No sidetone

01 = Left ADC

10 = Right ADC

11 = Reserved

Table 27 Digital Sidetone Control

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