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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8976CGEFL/V датащи(PDF) 36 Page - Wolfson Microelectronics plc |
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WM8976CGEFL/V датащи(HTML) 36 Page - Wolfson Microelectronics plc |
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36 / 114 page  WM8976 Production Data w PD, Rev 4.5, November 2011 36 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 104µs 832µs 6ms 0001 208µs 1.66ms 12ms 0010 416µs 3.33ms 24ms 0011 832µs 6.66ms 48ms 0100 1.66ms 13.3ms 96ms 0101 3.33ms 26.6ms 192ms 0110 6.66ms 53.2ms 384ms 0111 13.3ms 106ms 767ms 1000 26.6ms 213.2ms 1.53s 1001 53.2ms 426ms 3.07s 1010 106ms 852ms 6.13s Attack Time (s) ALCMODE = 0 (Normal Mode) ALCDCY tDCY tDCY6dB tDCY90% 0000 410µs 3.28ms 23.6ms 0001 820µs 6.56ms 47.2ms 0010 1.64ms 13.1ms 94.5ms 0011 3.28ms 26.2ms 189ms 0100 6.56ms 52.5ms 378ms 0101 13.1ms 105ms 756ms 0110 26.2ms 210ms 1.51s 0111 52.5ms 420ms 3.02s 1000 105ms 840ms 6.05s 1001 210ms 1.68s 12.1s 1010 420ms 3.36s 24.2s Decay Time (s) Table 19 ALC Normal Mode (Attack and Decay times) |
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