WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 44

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8985
Figure 21 ALC Normal Mode Operation
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Table 20 ALC Control Registers
NORMAL MODE
When the ALC is disabled, the input PGA remains at the last controlled value of the ALC. An input
gain update must be made by writing to the INPPGAVOLL/R register bits.
In normal mode, the ALC will attempt to maintain a constant signal level by increasing or decreasing
the gain of the PGA. The following diagram shows an example of this.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
0001
0010
… (time doubles with every step)
1010
45.4us
90.8us
23.2ms
DESCRIPTION
PP, Rev 3.5, March 2007
363.2us
726.4us
186ms
Pre-Production
1.348s
2.62ms
5.26ms
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