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TDA7411 Datasheet(PDF) 15 Page - STMicroelectronics |
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TDA7411 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 43 page  15/43 TDA7411 Center Frequency Figure 12 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz. Figure 12. Treble Center Frequencies @ Gain = 14dB Speaker Coupling In some applications additional signal manipulations are desired, for example surround-sound or more- band-equalizing. For this purpose an AC-Coupling with four different AC-Coupling inputs is placed before the speaker-attenuators. The input-impedance of the AC-Inputs is always 50k Ω with exception of AC input ACin1, which has pro- grammable input impedance. For ACin3 exists an internal mixing stage and an internal mono low pass filter, which is available as input only for the speaker FreeL/R. There are two possibilities for internal DC Coupling: – main channel after the bass filter – main channel after the middle filter (same as at ACout pin) The I2C bus programming tables shows the possible speaker sources. 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10. 0 100. 0 1.0K 10.0K |
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