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TDA7439 Scheda tecnica(PDF) 9 Page - STMicroelectronics |
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TDA7439 Scheda tecnica(HTML) 9 Page - STMicroelectronics |
9 / 23 page TDA7439 Application suggestions 9/23 Transposing and solving for the external component values we get: 3.1.2 Treble stage The treble stage is a high-pass filter whose time constant is fixed by an internal resistor (25 k Ω typically) and an external capacitor connected between treble pins and ground. Typical responses are shown in Figure 10 and Figure 11. 3.2 Pin CREF The suggested value of 10 µF for the reference capacitor (CREF), connected to pin CREF, can be reduced to 4.7 µF if the application requires faster power-on. 3.3 Electrical characteristics 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 5. THD vs frequency Figure 6. THD vs RLOAD |
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