WM8973CLGEFLSLASHV datasheet(20/63 Pages) WOLFSON

20 / 63 page

WM8973L

Production Data

PD, Rev 4.5, December 2011

The signal inputs are biased internally to the reference voltage VREF. Whenever the line inputs are

muted or the device placed into standby mode, the inputs are kept biased to VREF using special anti-

thump circuitry. This reduces any audible clicks that may otherwise be heard when changing inputs.

DC MEASUREMENT

For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1

and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and

microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a

signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The

input range for dc measurement is AGND to AVDD.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R32 (20h)

ADC Signal

Path Control

(Left)

7:6

LINSEL

Left Channel Input Select

00 = LINPUT1

01 = LINPUT2

10 = LINPUT3

11 = L-R Differential (either LINPUT1-

RINPUT1 or LINPUT2-RINPUT2,

selected by DS)

5:4

LMICBOOST

Left Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

R33 (21h)

ADC Signal

Path Control

(Right)

7:6

RINSEL

Right Channel Input Select

00 = RINPUT1

01 = RINPUT2

10 = RINPUT3

11 = L-R Differential (either LINPUT1-

RINPUT1 or LINPUT2-RINPUT2,

selected by DS)

5:4

RMICBOOST

Right Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

Table 3 Input Software Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (1Fh)

ADC input Mode

RDCM

Right Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on RINPUT1

LDCM

Left Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on LINPUT1

Table 4 DC Measurement Select

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (1Fh)

ADC Input Mode

Differential input select

0: LINPUT1 - RINPUT1

1: LINPUT2 – RINPUT2

Table 5 Differential Input Select

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