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TDA7468D Fiches technique(PDF) 7 Page - STMicroelectronics |
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TDA7468D Fiches technique(HTML) 7 Page - STMicroelectronics |
7 / 22 page 7/22 TDA7468D 3 APPLICATION SUGGESTIONS The first and the last stages are volume control blocks. The control range is 0 to -63dB (mute) with 1dB step resolution for this first one, 0 to 24dB (mute) with 8dB step resolution for the last one. The very high resolution allows the implementation of systems free from any noisy acoustical effect. The TDA7468D audioprocessor provides 2 bands tones control. 3.1 Bass, Stages The Bass cell has an internal resistor Ri = 44KΩ typical. 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: 3.2 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. 3.3 CREF The suggested 10 µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires faster power ON. Figure 5. F C 1 2 π R1 R2 C 1 C2 ⋅⋅ ⋅ ⋅⋅ ----------------------------------------------------------------- = A V R2 C2 R2 C1 R i C1 + + R2 C1 R2 C2 + ---------------------------------------------------------------- = Q R 1 R2 C1 C 2 ⋅⋅ ⋅ 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 |
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