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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SM5844 датащи(PDF) 16 Page - Nippon Precision Circuits Inc |
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SM5844 датащи(HTML) 16 Page - Nippon Precision Circuits Inc |
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16 / 26 page  SM5844AF NIPPON PRECISION CIRCUITS—16 Attenuator operation A change in the attenuation data DATT causes the gain to change smoothly from its previous value towards the new setting. The new attenuation data is stored in the attenuation data register and the current attenuation level is stored in a temporary register. Consequently, if a new attenuation level is read in before the previously set level is reached, the gain changes smoothly from the current value towards the latest setting as shown in figure 4. The attenuation counter output changes, and hence the gain changes, by 1 step every output sample. The time taken to reduce the gain from 0 dB (or 12 dB) to −∞ dB is (1024/fso), which corresponds to approximately 23.2 ms when fso = 44.1 kHz. Figure 4. Attenuator operation example Level 3 Level 1 Level 2 Level 4 Level 5 Time Gain ∆t 0 dB − ∞ |
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