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LM1973M Folha de dados(PDF) 5 Page - National Semiconductor (TI) |
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LM1973M Folha de dados(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 LM1973 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 2dB steps for a panning function as shown in Figure 5. 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 LM1973 can be configured with a mono audio sig- nal level control and with a panning control which separates the mono signal into left and right channels. This circuit may utilize the fundamental attenuation scheme of the LM1973 for the level control, but also possess a constant 2dB pan- ning control for the left and right channels as stated earlier. THD+Nvs Amplitude f = 20 Hz, V DD = ±6V V IN into CH1 @ 0dB DS011958-25 THD+Nvs Amplitude f = 1 kHz, V DD = ±6V V IN into CH1 @ 0dB DS011958-26 THD+Nvs Amplitude f = 20 kHz, V DD = ±6V V IN into CH1 @ 0dB DS011958-27 LM1973 Channel Attenuation vs Digital Step Value DS011958-7 FIGURE 3. LM1973 Attenuation Step Scheme LM1973 Channel Attenuation vs Digital Step Value (Programmed 1.0dB Steps) DS011958-14 FIGURE 4. LM1973 1.0dB and 2.0dB Attenuation Step Scheme www.national.com 5 |
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