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WM8983GEFL/V Datasheet(PDF) 48 Page - Wolfson Microelectronics plc |
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WM8983GEFL/V Datasheet(HTML) 48 Page - Wolfson Microelectronics plc |
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48 / 124 page  WM8983 Production Data w PD, Rev 4.3, May 2010 48 10. R34 = 0x01–0 - Enable Limiter mode (ALCMODE = 1). 11. Insert 1ms delay to allow input PGA gain update by the limiter circuit. 12. R59 = 0x00–0 - Turn off ALC test mode. 13. –2 - Enable input PGA (INPPGAENL/R = 1). Note: R32, R33, R45 and R46 register settings above need to be changed to reflect settings required in the target application. ATTACK AND DECAY TIMES The attack and decay times set the update times for the PGA gain. The attack time is the time constant used when the gain is reducing. The decay time is the time constant used when the gain is increasing. In limiter mode, the time constants are faster than in ALC mode. The time constants are shown below in terms of a single gain step, a change of 6dB and a change of 90% of the PGAs gain range. Note that, these times will vary slightly depending on the sample rate used (specified by the SR register). NORMAL MODE ALCMODE = 0 (Normal Mode) ALCATK tATK tATK6dB tATK90% 0000 104μs832μs6ms 0001 208μs 1.66ms 12ms 0010 416μs 3.33ms 24ms 0011 832μs 6.66ms 48ms 0100 1.66ms 13.32ms 96ms 0101 3.33ms 26.64ms 192ms 0110 6.66ms 53.28ms 384ms 0111 13.32ms 106.6ms 768ms 1000 26.64ms 213.2ms 1.53s 1001 53.28ms 426.4ms 3.07s 1010 106.6ms 852.8ms 6.14s Attack Time (s) ALCMODE = 0 (Normal Mode) ALCDCY tDCY tDCY6dB tDCY90% 0000 410μs3.3ms 24ms 0001 820μs6.6ms 48ms 0010 1.64ms 13.1ms 96ms 0011 3.28ms 26.2ms 192ms 0100 6.56ms 52.5ms 384ms 0101 13.12ms 105ms 768ms 0110 26.24ms 210ms 1.53s 0111 52.5ms 420ms 3.07s 1000 105ms 840ms 6.14s 1001 210ms 1.68s 12.28s 1010 420ms 3.36s 24.57s Decay Time (s) Table 20 ALC Normal Mode (Attack and Decay times) |
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