WM8953ECSSLASHRV datasheet(34/100 Pages) WOLFSON

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WM8953

Production Data

PD, January 2009, Rev 4.0

INPUT MIXER ENABLE

The WM8953 has two analogue input mixers which allow the Input PGAs and Line Inputs to be

combined in a number of ways and output to the ADCs.

The input mixers INMIXL and INMIXR are enabled by the AINL_ENA and AINR_ENA register bits, as

described in Table 9.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AINL_ENA

(rw)

Left Input Path Enable

0 = Input Path disabled

1 = Input Path enabled

R2 (02h)

AINR_ENA

(rw)

Right Input Path Enable

0 = Input Path disabled

1 = Input Path enabled

Table 9 Input Mixer Enable

INPUT MIXER VOLUME CONTROL

The Input Mixer volume controls are described in Table 10 for the Left Channel and Table 11 for the

Right Channel. The Input PGA levels may be set to Mute, 0dB or 30dB boost. The other gain controls

provide adjustment from -12dB to +6dB in 3dB steps.

To prevent pop noise it is recommended that gain and mute controls for the input mixers are not

modified while the signal paths are active. If volume control is required on the input signal path it is

recommended that the input PGA volume controls or the ADC volume controls are used instead of

the input mixer gain registers.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

L34MNB

LIN34 PGA Output to INMIXL Mute

0 = Mute

1 = Un-Mute

L34MNBST

LIN34 PGA Output to INMIXL Gain

0 = 0dB

1 = +30dB

L12MNB

LIN12 PGA Output to INMIXL Mute

0 = Mute

1 = Un-Mute

R41 (29h)

L12MNBST

LIN12 PGA Output to INMIXL Gain

0 = 0dB

1 = +30dB

R43 (2Bh)

8:6

LI2BVOL

[2:0]

000b

(Mute)

LIN2 Pin to INMIXL Gain and Mute

000 = Mute

001 = -12dB

010 = -9dB

011 = -6dB

100 = -3dB

101 = 0dB

110 = +3dB

111 = +6dB

Table 10 Left Input Mixer Volume Control

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