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TDA7438 датащи(PDF) 5 Page - STMicroelectronics |
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TDA7438 датащи(HTML) 5 Page - STMicroelectronics |
5 / 19 page 5/19 TDA7438 Figure 4. Test Circuit 3 APPLICATION SUGGESTIONS The first and the last stages are volume control blocks. The control range is 0 to -47dB (mute) for the first one, 0 to -79dB (mute) for the last one. Both of them have 1dB step resolution. The very high resolution allows the implementation of systems free from any noisy acoustical effect. The TDA7438 audioprocessor provides 3 bands tones control. 3.1 Bass, Middle Stages The Bass and the middle cells have the same structure. The Bass cell has an internal resistor Ri = 44K Ω typical. The Middle cell has an internal resistor Ri = 25K Ω typical. Several filter types can be implemented, connecting external components to the Bass/Middle IN and OUT pins. Figure 5. 0/30dB 2dB STEP MUXOUTL INL VOLUME VOLUME TREBLE TREBLE TREBLE(L) MIDDLE MIDDLE MUXOUTR INR TREBLE(R) BOUT(L) SPKR ATT LEFT LOUT SCL SDA DIGGND ROUT D96AU490A I 2CBUS DECODER + LATCHES 5.6nF 2.2 µF 100K 100K 100K G L-IN1 L-IN2 L-IN3 0.47 µF 0.47 µF 0.47 µF 100K 100K 100K R-IN1 R-IN2 R-IN3 0.47 µF 0.47 µF 0.47 µF G INPUT MULTIPLEXER + GAIN MOUT(L) BASS BIN(L) 18nF 22nF 100nF 100nF 2.7K 5.6K BASS SPKR ATT RIGHT MOUT(R) BOUT(R) BIN(R) 5.6nF 18nF 22nF 100nF 100nF 2.7K 5.6K SUPPLY 10 µF CREF AGND VS RM RB RM RB 27 3 4 5 2 1 28 21 22 20 26 24 25 8 9 19 10 11 12 13 23 6 7 18 17 16 14 15 VREF 2.2 µF Ri internal C2 OUT IN C1 R2 D95AU313 |
Аналогичный номер детали - TDA7438_04 |
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Аналогичное описание - TDA7438_04 |
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