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WM8758B Datasheet(PDF) 45 Page - Wolfson Microelectronics plc |
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WM8758B Datasheet(HTML) 45 Page - Wolfson Microelectronics plc |
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45 / 90 page  Production Data WM8758B w PD, Rev 4.4, January 2012 45 Figure 23 DAC Digital Limiter Operation The limiter has a programmable upper threshold which is close to 0dB. Referring to Figure 23, in normal operation (LIMBOOST=000 => limit only) signals below this threshold are unaffected by the limiter. Signals above the upper threshold are attenuated at a specific attack rate (set by the LIMATK register bits) until the signal falls below the threshold. The limiter also has a lower threshold 1dB below the upper threshold. When the signal falls below the lower threshold the signal is amplified at a specific decay rate (controlled by LIMDCY register bits) until a gain of 0dB is reached. Both threshold levels are controlled by the LIMLVL register bits. The upper threshold is 0.5dB above the value programmed by LIMLVL and the lower threshold is 0.5dB below the LIMLVL value. |
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