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TDA7440 Folha de dados(PDF) 5 Page - STMicroelectronics |
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TDA7440 Folha de dados(HTML) 5 Page - STMicroelectronics |
5 / 17 page 5/17 TDA7440D 3 APPLICATION SUGGESTIONS The first and the last stages are volume control blocks. The control range is 0 to -47dB (mute) for the first one, 0 to -79dB (mute) for the last one. Both of them have 1dB step resolution. The very high resolution allows the implementation of systems free from any noisy acoustical effect. The TDA7440D audioprocessor provides 3 bands tones control. 3.1 Bass Stage Several filter types can be implemented, connecting external components to the Bass IN and OUT pins. The fig.5 refers to basic T Type Bandpass Filter starting from the filter component values (R1 internal and R2,C1,C2 external) the centre frequency Fc, the gain Av at max. boost and the filter Q factor are computed as follows: Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be: Figure 5. Treble Stage The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25K Ω typical) and an external capacitor connected between treble pins and ground. Typical responses are reported in Figg. 14 to 17. CREF The suggested 10mF reference capacitor (CREF) value can be reduced to 4.7mF if the application re- quires faster power ON. F C 1 2 π R1 R2 C1 C2 ⋅⋅ ⋅ ⋅⋅ ----------------------------------------------------------------- = A V R2 C2 R2 C1 R i C1 + + R2 C1 R2 C2 + ---------------------------------------------------------------- = Q R1 R2 C1 C2 ⋅⋅ ⋅ R2 C1 R2 C2 + -------------------------------------------------- = C1 A V 1 – 2 π F C R i Q ⋅⋅ ⋅ ⋅ ------------------------------------------ C2 Q 2 C1 ⋅ A V 1 – Q 2 – ------------------------------ R2 A V 1 – Q 2 – 2 π C1 F C A V 1 – () Q ⋅⋅ ⋅ ⋅ ⋅ ----------------------------------------------------------------------- = = = Ri internal C2 OUT IN C1 R2 D95AU313 |
Nº de peça semelhante - TDA7440 |
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Descrição semelhante - TDA7440 |
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