WM8971L datasheet(18/56 Pages) WOLFSON

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WM8971L

Advanced Information

AI Rev 3.0 March 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:6

LINSEL

Left Channel Input Select

00 = LINPUT1

11 = Differential

R32 (20h)

ADC Signal

Path Control

(Left)

5:4

LMICBOOST

Left Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

7:6

RINSEL

Right Channel Input Select

00 = RINPUT1

01 = MIC

11 = Differential

R33 (21h)

ADC Signal

Path Control

(Right)

5:4

RMICBOOST

Right Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

Table 2 Input Software Control

MONO MIXING

The stereo ADC can operate as a stereo or mono device, or the two channels can be mixed to mono,

either in the analogue domain (i.e. before the ADC) or in the digital domain (after the ADC).

MONOMIX selects the mode of operation. The user also has the flexibility to select the data output

from the audio interface using DATSEL. The default is for left and right channel ADC data to be

output, but the interface may also be configured so that e.g. left channel ADC data is output as both

left and right data for when an analogue mono mix is selected.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (1Fh)

ADC input

Mode

7:6

MONOMIX

[1:0]

00: Stereo

01: Analogue Mono Mix (using left ADC)

10: Analogue Mono Mix (using right ADC)

11: Digital Mono Mix

Table 3 Mono Mixing

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R23 (17h)

Additional

Control (1)

3:2

DATSEL

[1:0]

00: left data=left ADC; right data =right ADC

01: left data =left ADC; right data = left ADC

10: left data = right ADC; right data =right ADC

11: left data = right ADC; right data = left ADC

Table 4 ADC Data Output Configuration

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