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LM1972N Arkusz danych(PDF) 5 Page - National Semiconductor (TI) |
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LM1972N Arkusz danych(HTML) 5 Page - National Semiconductor (TI) |
5 / 11 page Typical Performance Characteristics (Continued) Application Information ATTENUATION STEP SCHEME The fundamental attenuation step scheme for the LM1972 µPot is shown in Figure 3. This attenuation step scheme, however, can be changed through programming techniques to fit different application requirements. One such example would be a constant logarithmic attenuation scheme of 1dB steps for a panning function as shown in Figure 4. The only restriction to the customization of attenuation schemes are the given attenuation levels and their corresponding data bits shown in Table 1. The device will change attenuation levels only when a channel address is recognized. When recognized, the attenuation level will be changed corre- sponding to the data bits shown in Table 1. As shown in Fig- ure 6, an LM1972 can be configured as a panning control which separates the mono signal into left and right channels. This circuit may utilize the fundamental attenuation scheme of the LM1972 or be programmed to provide a constant 1dB logarithmic attenuation scheme as shown in Figure 4. THD+Nvs Amplitude DS011978-24 THD+Nvs Amplitude DS011978-25 THD+Nvs Amplitude DS011978-26 LM1972 Channel Attenuation vs Digital Step Value DS011978-6 FIGURE 3. LM1972 Attenuation Step Scheme LM1972 Channel Attenuation vs Digital Step Value (Programmed 1.0dB Steps) DS011978-7 FIGURE 4. LM1972 1.0dB Attenuation Step Scheme LM1972 Channel Attenuation vs Digital Step Value (Programmed 2.0dB Steps) DS011978-8 FIGURE 5. LM1972 2.0dB Attenuation Step Scheme www.national.com 5 |
Podobny numer części - LM1972N |
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Podobny opis - LM1972N |
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