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TDA7410ND Arkusz danych(PDF) 11 Page - STMicroelectronics |
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TDA7410ND Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 34 page TDA7410ND Description of the audioprocessor part 11/34 5 Description of the audioprocessor part 5.1 Input matrix The input matrix of the TDA7410ND offers several possibilities to adapt the audioprocessor to the desired application (see Figure 1). Into the standard application we have: ● CD quasi differential ● Cassette stereo ● Phone ● AM mono ● Stereodecoder input Figure 3. Input Stage 5.2 AutoZero In order to reduce the number of pins there is no AC coupling between the In-Gain and the following stage, so that any offset generated by or before the In-Gain stage would be transferred or even amplified to the output. To avoid that effect a special offset cancellation stage called AutoZero is implemented. To avoid audible clicks the audioprocessor is muted before the volume stage during this time. In some cases, for example if the P is executing a refresh cycle of the I2C bus programming, it is not useful to start a new AutoZero action because no new source is selected and an undesired mute would appear at the outputs. For such applications the TDA7410D could be switched in the "Auto Zero Remain" mode (Bit 6 of the subaddress byte). If this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and the old adjustment value remains. 100K CD CDGND - + D05AU1613 100K 100K 100K STEREODECODER IN GAIN PHONE AM MPX 100K 100K CASSETTE |
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