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TDA7434 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7434 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 10 page Loudness MSB LSB LOUDNESS D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D0 0dB -1dB -2dB : -3dB -4dB -5dB -6dB -7dB -8dB -9dB -10dB -11dB -12dB -13dB -14dB -15dB Loudness flat (Note 3) For example to select -14dB Loudness the Data Byte is : X X X 01110. Note 3: FIat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to ”0”. In this case the attenuation is 0dB independent from the loudness settings. Functional Description The input selector is able to select 2 stereo inputs and 1 mono input (AM). The inputs are DC biased with a 100k Ω resistors to the internal reference voltage of 3V. The AM input can be used addi- tionally as hardware mute pin. If this pin is pulled to ground by an external transistors and AM is not selected, 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 for a four speaker system. The attenuation steps size is 1 db from 0 to -24dB and increases nonlinearly 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. TDA7434 8/10 |
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Descripción similar - TDA7434 |
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