WM8946ECSSLASHR datasheet(30/175 Pages) WOLFSON

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WM8946

Production Data

PD, July 2012, Rev 4.3

ADC VOLUME CONTROL

The output of the ADCs can be digitally amplified or attenuated over a range from -71.625dB to

+23.625dB in 0.375dB steps. The volume of each channel can be controlled separately using

ADCL_VOL or ADCR_VOL. The ADC Volume is part of the ADC Digital Filters block. The gain for a

given eight-bit code X is given by:

0.375

 (X-192) dB for 1  X  255;

MUTE for X = 0

The ADC_VU bit controls the loading of digital volume control data. When ADC_VU is set to 0, the

ADCL_VOL or ADCR_VOL control data is loaded into the respective control register, but does not

actually change the digital gain setting. Both left and right gain settings are updated when a 1 is

written to ADC_VU. This makes it possible to update the gain of both channels simultaneously.

The output of the ADCs can be digitally muted using the ADCL_MUTE or ADCR_MUTE bits. Both

ADCs are muted simultaneously when the ADC_MUTEALL bit is set.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R25 (19h)

ADC Control 1

ADC_MUTEALL

ADC Digital Mute for All Channels

0 = Disable Mute

1 = Enable Mute on all channels

R27 (1Bh)

Left ADC

Digital Vol

ADC_VU

ADC Volume Update

Writing a 1 to this bit will cause

Left and Right ADC volume to be

updated simultaneously

ADCL_MUTE

Left ADC Digital Mute

0 = Disable Mute

1 = Enable Mute

7:0

ADCL_VOL [7:0]

1100_0000

(0dB)

Left ADC Digital Volume

0000_0000 = mute

0000_0001 = -71.625dB

0000_0010 = -71.250dB

…

1100_0000 = 0dB

...

1111_1111 = +23.625dB

(See Table 9 for volume range)

R28 (1Ch)

Right ADC

Digital Vol

ADC_VU

ADC Volume Update

Writing a 1 to this bit will cause

Left and Right ADC volume to be

updated simultaneously

ADCR_MUTE

Right ADC Digital Mute

0 = Disable Mute

1 = Enable Mute

7:0

ADCR_VOL [7:0]

1100_0000

(0dB)

Right ADC Digital Volume

0000_0000 = mute

0000_0001 = -71.625dB

0000_0010 = -71.250dB

…

1100_0000 = 0dB

...

1111_1111 = +23.625dB

(See Table 9 for volume range)

Table 8 ADC Digital Volume Control

WM8946ECS/R Datasheet(PDF) 30 Page - Wolfson Microelectronics plc

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