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WM8591GEDS/RV データシート(PDF) 33 Page - Wolfson Microelectronics plc |
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WM8591GEDS/RV データシート(HTML) 33 Page - Wolfson Microelectronics plc |
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33 / 51 page  Production Data WM8591 w PD Rev 4.0 December 2005 33 LIMITER / AUTOMATIC LEVEL CONTROL (ALC) The WM8591 has an automatic pga gain control circuit, which can function as a peak limiter or as an automatic level control (ALC). In peak limiter mode, a digital peak detector detects when the input signal goes above a predefined level and will ramp the pga gain down to prevent the signal becoming too large for the input range of the ADC. When the signal returns to a level below the threshold, the pga gain is slowly returned to its starting level. The peak limiter cannot increase the pga gain above its static level. Figure 21 Limiter Operation In ALC mode, the circuit aims to keep a constant recording volume irrespective of the input signal level. This is achieved by continuously adjusting the PGA gain so that the signal level at the ADC input remains constant. A digital peak detector monitors the ADC output and changes the PGA gain if necessary. input signal signal after PGA PGA gain Limiter threshold attack time decay time |
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