WM8973CLGEFLSLASHV datasheet(21/63 Pages) WOLFSON

21 / 63 page

Production Data

WM8973L

PD, Rev 4.5, December 2011

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. For analogue mono mix either the left or right channel ADC

can be used, allowing the unused ADC to be powered off or used for a dc measurement conversion.

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.

Note:

If DC measurement is selected this overrides the MONOMIX selection.

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 6 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 7 ADC Data Output Configuration

The MICBIAS output provides a low noise reference voltage suitable for biasing electret type

microphones and the associated external resistor biasing network. Refer to the Applications

Information section for recommended external components. The output can be enabled or disables

using the MICB control bit (see also the “Power Management” section).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R25 (19h)

Power

Management (1)

MICB

Microphone Bias Enable

0 = OFF (high impedance output)

1 = ON

Table 8 Microphone Bias Control

The internal MICBIAS circuitry is shown below. Note that the maximum source current capability for

MICBIAS is 3mA. The external biasing resistors therefore must be large enough to limit the MICBIAS

current to 3mA.

AGND

MICBIAS

= 1.8 x VMID

= 0.9 X AVDD

VMID

internal

resistor

internal

resistor

MICB

Figure 8 Microphone Bias Schematic

WM8973CLGEFL/V データシート(PDF) 21 Page - Wolfson Microelectronics plc

WM8973CLGEFL/V データシート(HTML) 21 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

データシートダウンロード

リンク URL

WM8973CLGEFL/V データシート(PDF) 21 Page - Wolfson Microelectronics plc

WM8973CLGEFL/V データシート(HTML) 21 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

データシート ダウンロード

リンク URL

データシートダウンロード