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TDA7406 数据表(PDF) 17 Page - STMicroelectronics |
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TDA7406 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 64 page  TDA7406 Description of the audioprocessor part 17/64 Figure 3. Input-stages 4.2 AutoZero The AutoZero allows a reduction of the number of pins as well as external components by canceling any offset generated by or before the In-Gain-stage (Please notice that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not canceled). The auto-zeroing is started every time the DATA-BYTE 0 is selected and needs max. 0.3ms for the alignment. To avoid audible clicks the Audioprocessor have to be muted by soft mute or hard mute during this time. 4.2.1 AutoZero for Stereodecoder-Selection A special procedure is recommended for selecting the stereodecoder at the input-selector to guarantee an optimum offset-cancellation: (Step 0: SoftMute or Mute the signal-path) Step 1: Temporary deselect the stereodecoder at the input-selector Step 2: Configure the stereodecoder via IIC-Bus Step 3: Wait 1ms Step 4: Select the stereodecoder |
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