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TDA7439DS Datasheet(PDF) 5 Page - STMicroelectronics |
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TDA7439DS Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 16 page  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 TDA7439DS audioprocessor provides 3 bands tones control. Bass, Middle Stages The Bass and the middle cells have the same structure. The Bass cell has an internal resistor Ri = 44K Ω typical. The Middle cell has an internal resistor Ri = 25K Ω typical. Several filter types can be implemented, connect- ing external components to the Bass/Middle IN and OUT pins. The fig.1 refers to basic T Type Bandpass Filter starting from the filter component values (R1 in- ternal and R2,C1,C2 external) the centre fre- quency Fc, the gain Av at max. boost and the fil- ter Q factor are computed as follows: FC = 1 2 ⋅ π ⋅√ R1 ⋅ R2 ⋅ C1 ⋅ C2 AV = R2 C2 + R2 C1 + Ri C1 R2 C1 + R2 C2 Q = √ R1 ⋅ R2 ⋅ C1 ⋅ C2 R2 C1 + R2 C2 Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be: C1 = AV − 1 2 ⋅ π ⋅ FC ⋅ Ri ⋅ Q C2 = Q 2 ⋅ C1 AV − 1 − Q2 R2 = AV − 1 − Q2 2 ⋅ π ⋅ C1 ⋅ FC ⋅ (AV − 1) ⋅Q 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 be- tween treble pins and ground Typical responses are reported in Figg. 10 to 13. CREF The suggested 10 µF reference capacitor (CREF) value can be reduced to 4.7 µF if the application requires faster power ON. Ri internal C2 OUT IN C1 R2 D95AU313 Figure 1. Figure 2: THD vs. frequency Figure 3: THD vs. RLOAD ® TDA7439DS 5/16 |
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