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WM8980CGEFL/V データシート(PDF) 41 Page - Wolfson Microelectronics plc |
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WM8980CGEFL/V データシート(HTML) 41 Page - Wolfson Microelectronics plc |
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41 / 123 page  Pre-Production WM8980 w PP, Rev 3.8, May 2012 41 MINIMUM AND MAXIMUM GAIN 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. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R32 ALC Control 1 5:3 ALCMAX 111 Set Maximum Gain of PGA 2:0 ALCMIN 000 Set minimum gain of PGA Table 21 ALC Max/Min Gain 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. Figure 19 ALC Min/Max Gain ALCMAX Maximum Gain (dB) 111 35.25 110 29.25 101 23.25 100 17.25 011 11.25 010 5.25 001 -0.75 000 -6.75 Table 22 ALC Max Gain Values |
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