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TDA7403 数据表(PDF) 6 Page - STMicroelectronics |
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TDA7403 数据表(HTML) 6 Page - STMicroelectronics |
6 / 25 page Input stages The input circuits are the same as in preceeding ST audioprocessors with exception of the CD in- puts (see figure 1). The typical input impedance is 100k Ω. AutoZero In order to reduce the number of pins there is no AC coupling between the In-Gain and the follow- ing stage, so that any offset generated by or be- fore 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 loudness stage during this time. In some cases, for example if the µP is executing a refresh cycle of the I 2C 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 applica- tions the TDA7403 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. Softmute The digitally controlled softmute stage allows muting/demuting the signal with a I 2C bus pro- grammable slope. The mute process can either be activated by the softmute pin or by the I 2C bus. The slope is realized in a special S shaped curve to mute slow in the critical regions (see fig- ure 2). For timing purposes the Bit 3 of the I 2C bus out- put register is set to 1 from the start of muting un- til the end of demuting. D98AU951 100K 100K 100K STEREODECODER IN GAIN CASSETTE AM MPX Figure 1. Input stages DESCRIPTION OF THE AUDIOPROCESSOR 1 EXT. MUTE +SIGNAL REF -SIGNAL 1 I 2C BUS OUT Time D97AU634 Figure 2. Softmute Timing 2dB 1dB -1dB -2dB Time D97AU635 VOUT 10ms Figure 3. Soft Step Timing Note: Please notice that a started Mute action is always terminated and could not be interrupted by a change of the mute signal. Note: For steps more than 1dB the softstep mode should be deactivated because it could generate a 1dB error during the blend-time TDA7403 6/25 |
类似零件编号 - TDA7403_02 |
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类似说明 - TDA7403_02 |
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