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TDA7433D Fiches technique(PDF) 8 Page - STMicroelectronics |
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TDA7433D Fiches technique(HTML) 8 Page - STMicroelectronics |
8 / 10 page Functional Description The input selector is able to select 2 stereo inputs and 1 mono input (AM). The inputs are DC biased with 100k Ω resistors to the internal reference volt- age of 3V. The mono input can be used addition- ally as hardware mute pin. If this pin is pulled to ground by an external transistor and AM is not se- lected, the input selector mutes the input (refer- ence voltage selected). The AM part is consid- ered to be switched OFF. If the output of the AM part is not high ohmic in this condition, a series resistor of about 20k Ω has to be foreseen. The volume control can be programmed from a gain of +32dB to an attenuation of -79dB in 1dB steps. The maximum gain should be kept as low as possible for system performance reason. It has to be limited by software to the absolute neces- sary system gain, depending on the signal source level and the power amplifier gain. The bass control acts in a range from +18dB to - 18dB in 2dB steps. The filter response is deter- mined by the external filter components. An ex- tensive simulation software is available in order to support the design of the bass filter response with different filter configurations. The extended bass boost range of +18dB allows the implementation of the software loudness func- tion by additional bass and treble boost. The treble control acts in a range of ±14dB in 2dB steps. The external capacitor determines with the internal resistor of 50K Ω the corner frequency of the treble response. The four speaker attenuators can be controlled in- dependently from 0 to -37.5dB, which allows the implementation of balance and fader a the four speaker system. The attenuation steps size is 1 db from 0 to -24dB and increases non linearly up to the maximum attenuation of 37.5dB. A special mute bit forces the speaker attenuator into the mute position. All 4 outputs are low distortion push pull outputs, able to drive a load of 3k Ω. TDA7433 8/10 |
Numéro de pièce similaire - TDA7433D |
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Description similaire - TDA7433D |
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