WM8971LEFLSLASHR datasheet(22/56 Pages) WOLFSON

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WM8971L

Advanced Information

AI Rev 3.0 March 2004

DIGITAL ADC VOLUME CONTROL

The output of the ADCs can be digitally amplified or attenuated over a range from –97dB to +30dB in

0.5dB steps. The volume of each channel can be controlled separately. The gain for a given eight-bit

code X is given by:

0.5

× (X-195) dB for 1 ≤ X ≤ 255;

MUTE for X = 0

The LAVU and RAVU control bits control the loading of digital volume control data. When LAVU or

RAVU are set to 0, the LADCVOL or RADCVOL control data will be loaded into the respective control

updated when either LAVU or RAVU are set to 1. This makes it possible to update the gain of both

channels simultaneously.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

LADCVOL

[7:0]

11000011

( 0dB )

Left ADC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -97dB

0000 0010 = -96.5dB

... 0.5dB steps up to

1111 1111 = +30dB

R21 (15h)

Left ADC

Digital Volume

LAVU

Left ADC Volume Update

0 = Store LADCVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = LADCVOL, right =

intermediate latch)

7:0

RADCVOL

[7:0]

11000011

( 0dB )

Right ADC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -97dB

0000 0010 = -96.5dB

... 0.5dB steps up to

1111 1111 = +30dB

R22 (16h)

Right ADC

Digital Volume

RAVU

Right ADC Volume Update

0 = Store RADCVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = intermediate latch, right

= RADCVOL)

Table 8 ADC Digital Volume Control

WM8971LEFL/R Datasheet(PDF) 22 Page - Wolfson Microelectronics plc

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