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TDA7439 Datasheet(PDF) 6 Page - STMicroelectronics |
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TDA7439 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 19 page TDA7439 6/19 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 Typical responses are reported in Figg. 10 to 13. 3.3 CREF The suggested 10 µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires faster power ON. F C 1 2 π R1 R2 C 1 C2 ⋅⋅ ⋅ ⋅⋅ ----------------------------------------------------------------- = A V R2C 2 R2C1 RiC1 ++ R2 C1 R2C2 + ------------------------------------------------------------ = Q R 1 R2 C1 C2 ⋅⋅ ⋅ R 2C1 R2C2 + -------------------------------------------------- = C1 A V 1 – 2 π Fc Ri Q ⋅⋅ ⋅ ⋅ ------------------------------------------ C2 Q 2 C1 ⋅ A V 1 – Q 2 – ------------------------------ = = R2 A V 1 – Q 2 – 2 π C1 Fc A V 1 – () Q ⋅⋅ ⋅⋅ ⋅ ---------------------------------------------------------------------- = Figure 6. THD vs. frequency Figure 7. THD vs. RLOAD |
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