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データシートサーチシステム |
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データシートサーチシステム |
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TDA7461N データシート(PDF) 9 Page - STMicroelectronics |
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TDA7461N データシート(HTML) 9 Page - STMicroelectronics |
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9 / 32 page  Mixing Stage This stage offers the possibility to mix the internal beep or the phone signal to any other source. Due to the fact that the mixing stage is also lo- cated behind the In-Gain stage fine adjustments of the main source level can be done in this way. Loudness There are four parameters programmable in the loudness stage (see fig. 3, 4, 5): - Attenuation - Center Frequency - Loudness Q - Flat Mode: in this mode the loudness stage works as a 0 - 15dB attenuator. 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 6). 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. 15K 15K 100K CD CDGND 15K 15K - + 15K 15K PHONE PH_GND 15K 15K - + D97AU633A 100K 100K 100K STEREODECODER IN GAIN CASSETTE AM MPX Figure 2. Input stages -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0K 10.0K Figure 3. Loudness Attenuation @ fc = 400Hz (second order) -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0K 10.0K Figure 4. Loudness Center frequency @ Attn. = 15dB (second order) TDA7461N 9/32 |
同様の部品番号 - TDA7461N_03 |
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同様の説明 - TDA7461N_03 |
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