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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8978CGEFL/V датащи(PDF) 41 Page - Wolfson Microelectronics plc |
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WM8978CGEFL/V датащи(HTML) 41 Page - Wolfson Microelectronics plc |
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41 / 118 page  Production Data WM8978 w PD, Rev 4.5, October 2011 41 LIMITER MODE ALCMODE = 1 (Limiter Mode) ALCATK tATKLIM tATKLIM6dB tATKLIM90% 0000 22.7µs 182µs 1.31ms 0001 45.4µS 363µs 2.62ms 0010 90.8µS 726µs 5.23ms 0011 182µS 1.45ms 10.5ms 0100 363µS 2.91ms 20.9ms 0101 726µS 5.81ms 41.8ms 0110 1.45ms 11.6ms 83.7ms 0111 2.9ms 23.2ms 167ms 1000 5.81ms 46.5ms 335ms 1001 11.6ms 93ms 669ms 1010 23.2ms 186ms 1.34s Attack Time (s) ALCMODE = 1 (Limiter Mode) ALCDCY tDCYLIM tDCYLIM6dB tDCYLIM90% 0000 90.8µs 726µs 5.23ms 0001 182µS 1.45ms 10.5ms 0010 363µS 2.91ms 20.9ms 0011 726µS 5.81ms 41.8ms 0100 1.45ms 11.6ms 83.7ms 0101 2.91ms 23.2ms 167ms 0110 5.81ms 46.5ms 335ms 0111 11.6ms 93ms 669ms 1000 23.2ms 186ms 1.34s 1001 46.5ms 372ms 2.68s 1010 93ms 744ms 5.36s Attack Time (s) Table 19 ALC Limiter Mode (Attack and Decay times) 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 20 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. |
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