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TDA7405 数据表(PDF) 10 Page - STMicroelectronics |
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TDA7405 数据表(HTML) 10 Page - STMicroelectronics |
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10 / 56 page  TDA7405 10/56 2 DESCRIPTION OF THE AUDIOPROCESSOR PART 2.1 Input stages In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single- ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present. Figure 1. Input stages 2.1.1 Full-differential stereo Input 1 (FD1) The FD1-input is implemented as a buffered full-differential stereo stage with 100k Ω input-impedance at each input. The attenuation is programmable in 3 steps from 0 to -12dB in order to adapt the incoming signal level. A 6dB attenuation is included in the differential stage, the additional 6dB are done by a following resistive divid- er. This input is also configurable as two single-ended stereo inputs (see pin-out). 2.1.2 Full-differential stereo Input 2 (FD2) The FD2-input has the same general structure as FD1, but with a programmable attenuation of 0 or 6dB em- bedded in the differential stage. |
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