WM8978_06 Wolfson Microelectronics Ltd., WM8978_06 Datasheet - Page 46

• Manufacturer Part Number: WM8978_06
• Description: Stereo Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8978
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MINIMUM AND MAXIMUM GAIN
Table 23 ALC Max/Min Gain
Figure 21 ALC Min/Max Gain
Table 24 ALC Max Gain Values
The ALCMIN and ALCMAX register bits set the minimum/maximum gain value that the PGA can be
set to whilst under the control of the ALC. This has no effect on the PGA when ALC is not enabled.
In normal mode, ALCMAX sets the maximum boost which can be applied to the signal. In limiter
mode, ALCMAX will normally have no effect (assuming the starting gain value is less than the
maximum gain specified by ALCMAX) because the maximum gain is set at the starting gain level.
ALCMIN sets the minimum gain value which can be applied to the signal.
ALCMAX
111
110
101
100
011
010
001
000
R32
ALC Control
1
REGISTER
ADDRESS
5:3
2:0
Maximum Gain (dB)
BIT
ALCMAX
ALCMIN
35.25
29.25
23.25
17.25
11.25
-0.75
-6.75
5.25
LABEL
111
000
DEFAULT
Set Maximum Gain of PGA
Set minimum gain of PGA
DESCRIPTION
PP Rev 3.0 May 2006
Pre-Production
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