PDF TDA7439DS Data sheet ( Hoja de datos )

Número de pieza	TDA7439DS
Descripción	THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
Fabricantes	ST Microelectronics
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No Preview Available ! ® TDA7439DS THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR INPUT MULTIPLEXER - 4 STEREO INPUTS - SELECTABLE INPUT GAIN FOR OPTIMAL ADAPTATION TO DIFFERENT SOURCES ONE STEREO OUTPUT TREBLE, MIDDLE AND BASS CONTROL IN 2.0dB STEPS VOLUME CONTROL IN 1.0dB STEPS TWO SPEAKER ATTENUATORS: - TWO INDEPENDENT SPEAKER CONTROL IN 1.0dB STEPS FOR BALANCE FACILITY - INDEPENDENT MUTE FUNCTION ALL FUNCTION ARE PROGRAMMABLE VIA SERIAL BUS DESCRIPTION The TDA7439DS is a volume tone (bass, middle and treble) balance (Left/Right) processor for quality audio applications in car-radio and Hi-Fi systems. Selectable input gain is provided. Control of all SO28 ORDERING NUMBERS: TDA7439DS the functions is accomplished by serial bus. The AC signal setting is obtained by resistor net- works and switches combined with operational amplifiers. Thanks to the used BIPOLAR/CMOS Technology, Low Distortion, Low Noise and DC stepping are obtained BLOCK DIAGRAM 4 L-IN1 5 L-IN2 6 L-IN3 7 L-IN4 100K 100K 100K 100K 3 R-IN1 2 R-IN2 1 R-IN3 28 R-IN4 100K 100K 100K 100K MUXOUTL 8 TREBLE(L) MIN(L) MOUT(L) BIN(L) BOUT(L) 18 17 16 14 15 RM RB SPKR ATT 27 G VOLUME TREBLE MIDDLE BASS LEFT LOUT 0/30dB 2dB STEP I2CBUS DECODER + LATCHES 21 SCL 22 SDA 20 DIG_GND G VOLUME INPUT MULTIPLEXER + GAIN 9 MUXOUTR TREBLE MIDDLE BASS SPKR ATT RIGHT VREF SUPPLY RM RB 19 10 11 12 13 23 TREBLE(R) MIN(R) MOUT(R) BIN(R) BOUT(R) CREF 26 ROUT 24 25 VS AGND D97AU621 April 1999 1/16 1 page TDA7439DS 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 TDA7439DS audioprocessor provides 3 bands tones control. Bass, Middle Stages The Bass and the middle cells have the same structure. The Bass cell has an internal resistor Ri = 44KΩ typical. The Middle cell has an internal resistor Ri = 25KΩ typical. Several filter types can be implemented, connect- ing external components to the Bass/Middle IN and OUT pins. Figure 1. Ri internal IN OUT C1 C2 R2 D95AU313 The fig.1 refers to basic T Type Bandpass Filter starting from the filter component values (R1 in- ternal and R2,C1,C2 external) the centre fre- quency Fc, the gain Av at max. boost and the fil- ter Q factor are computed as follows: FC = 1 2 ⋅ π ⋅√R1⋅R2⋅C1⋅ C2 AV = R2 C2 + R2 C1 + Ri R2 C1 + R2 C2 C1 Q = √R1⋅ R2⋅C1⋅C2 R2 C1 + R2 C2 Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be: C1 = 2 ⋅ π AV − 1 ⋅ FC ⋅ Ri ⋅ Q C2 = Q2 AV − ⋅ C1 1 − Q2 R2 = 2 ⋅ π ⋅ AV − 1 C1 ⋅ FC − Q2 ⋅ (AV − 1) ⋅Q Treble Stage The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25KΩ typical) and an external capacitor connected be- tween treble pins and ground Typical responses are reported in Figg. 10 to 13. CREF The suggested 10µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires faster power ON. Figure 2: THD vs. frequency Figure 3: THD vs. RLOAD 5/16 ® 5 Page DATA BYTES (continued) BASS SELECTION MSB LSB D7 D6 D5 D4 D3 D2 D1 D0 0000 0001 0010 0011 0100 0101 0110 0111 1111 1110 1101 1100 1011 1010 1001 1000 TDA7439DS BASS 2dB STEPS -14dB -12dB -10dB -8dB -6dB -4dB -2dB 0dB 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB MIDDLE SELECTION MSB LSB D7 D6 D5 D4 D3 D2 D1 D0 0000 0001 0010 0011 0100 0101 0110 0111 1111 1110 1101 1100 1011 1010 1001 1000 MIDDLE 2dB STEPS -14dB -12dB -10dB -8dB -6dB -4dB -2dB 0dB 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB 11/16 ® 11 Page

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