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TDA7461ND датащи(PDF) 8 Page - STMicroelectronics |
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TDA7461ND датащи(HTML) 8 Page - STMicroelectronics |
8 / 31 page How to find the right input configuration The best way to come to the desired configura- tion may be to go through the application tree from the top to the bottom while making the spe- cific decisions. This way will lead to one of the six possible appli- cations. Then take the number of the application and go into the pinning table. Here you will find the special pinout as well as the special program- ming codes for selecting sources. For example in Appl. 6 the TDA7461N has to be configured while startup with the databyte 0/xxxx0xxx. To select the FM, AM or phone source the last five significant bits of subaddress 0 have to be changed, for any other source the last three bits are sufficient (see data byte specification). Input stages Most of the input circuits are the same as in pre- ceeding ST audioprocessors with exception of the CD inputs (see figure 2). In the meantime there are some CD players in the market having a significant high source im- pedance which affects strongly the common- mode rejection of the normal differential input stage. The additional buffer of the CD input avoids this drawback and offers the full common- mode rejection even with those CD players. The TDA7461N can be configured with an addi- tional input; if the AC coupling before the speaker stage is not used (bit 7 in subaddress 5 set to ”1”) ACINL and ACINR pins can be used as an addi- tional stereo input. 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 TDA7461N could be switched in the ”Auto Zero Remain” mode (Bit 6 of the subad- dress byte). If this bit is set to high, the DAT- ABYTE 0 could be loaded without invoking the AutoZero and the old adjustment value remains. PIN NUMBER Appl. No 6 8 9 10 Programming 1) 1CDGND PhoneGND Phone AMMONO Startup: 0/xxx11xxx 2CDGND PhoneGND AMRIGHT AMLEFT Startup: 0/xxxx1xxx FM AM Phone 0/xxx11100 0/xxx01011 0/xxx11010 3CDGND PhoneGND Phone AMSTD Startup: 0/xxxx1xxx FM AM Phone 0/xxx11100 0/xxx01100 0/xxx11010 4 CDRGND CDLGND Phone AMMONO Startup: 0/xxxx0xxx 5 CDRGND CDLGND AMRIGHT AMLEFT Startup: 0/xxxx0xxx FM AM 0/xxx10100 0/xxx00011 6 CDRGND CDLGND Phone AMSTD Startup: 0/xxxx0xxx FM AM Phone 0/xxx10100 0/xxx00100 0/xxx10010 1) Syntax 0/xxx11100 means: SUBADDR ESS = 0 - DATA BYTE = xxx11100 (x - don’t care) TDA7461N 8/31 |
Аналогичный номер детали - TDA7461ND |
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Аналогичное описание - TDA7461ND |
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