PDF TDA7318 Data sheet ( Hoja de datos )

Número de pieza	TDA7318
Descripción	DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
Fabricantes	ST Microelectronics
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No Preview Available ! ® TDA7318 DIGITAL CONTROLLED STEREO AUDIO PROCESSOR INPUT MULTIPLEXER: - 4 STEREO INPUTS - SELECTABLE INPUT GAIN FOR OPTIMAL ADAPTION TO DIFFERENT SOURCES INPUT AND OUTPUT FOR EXTERNAL EQUALIZER OR NOISE REDUCTION SYS- TEM VOLUME CONTROL IN 1.25dB STEPS TREBLE AND BASS CONTROL FOUR SPEAKER ATTENUATORS: - 4 INDEPENDENT SPEAKERS CONTROL IN 1.25dB STEPS FOR BALANCE AND FADER FACILITIES - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SE- RIALI2C BUS DESCRIPTION The TDA7318 is a volume, tone (bass and treble) balance (Left/Right) and fader (front/rear) processor for quality audio applications in car radio and Hi-Fi systems. DIP28 SO28 ORDERING NUMBERS: TDA7318 TDA7318D Selectable input gain is provided. Control is accom- plished by serial I2C bus microprocessor interface. The AC signal setting is obtained by resistor networks andswitches combined with operationalamplifiers. Thanks to the used BIPOLAR/CMOS Tecnology, Low Distortion, Low Noise and Low DC stepping are obtained. PIN CONNECTION (Top view) November 1999 1/14 1 page TDA7318 ELECTRICAL CHARACTERISTICS (continued) Symbol AUDIO OUTPUTS Parameter Test Condition Min. Typ. Max. Unit VOCL RL CL ROUT VOUT GENERAL Clipping Level Output Load Resistance Output Load Capacitance Output resistance DC Voltage Level d = 0.3% 2 2.5 Vrms 2 KΩ 10 nF 30 75 120 Ω 4.2 4.5 4.8 V eNO Output Noise S/N Signal to Noise Ratio d Distortion Sc Channel Separation left/right Total Tracking error BUS INPUTS BW = 20-20KHz, flat output muted all gains = 0dB A curve all gains = 0dB all gains = 0dB; VO = 1Vrms AV = 0, VIN = 1Vrms AV = -20dB VIN = 1Vrms VIN = 0.3Vrms AV = 0 to -20dB -20 to -60 dB 2.5 µV 5 15 µV 3 µV 106 dB 0.01 0.09 0.04 0.1 0.3 % % % 80 103 dB 0 1 dB 0 2 dB VIL Input Low Voltage VIH Input High Voltage IIN Input Current VO Output Voltage SDA Acknowledge IO = 1.6mA 1V 3V -5 +5 µA 0.4 V Notes: (1) Bass and Treble response see attached diagram (fig.19). The center frequency and quality of the resonance behaviour can be choosen by the external circuitry. A standard first order bass response can be realized by a standard feedback network (2) The selected input is grounded thru the 2.2µF capacitor. Figure 1: Noise vs. Volume/Gain Settings Figure 2: Signal to Noise Ratio vs. Volume Setting 5/14 5 Page TDA7318 Audio Switch MSB LSB 0 1 0 G1 G0 S2 S1 S0 000 001 010 011 100 101 110 111 00 01 10 11 For example to select the stereo 2 input with a gain of +12.5dB the 8bit string is: 01001001 FUNCTION Audio Switch Stereo 1 Stereo 2 Stereo 3 Stereo 4 Not allowed Not allowed Not allowed Not allowed +18.75dB +12.5dB +6.25dB 0dB Bass and Treble 0 1 1 0 C3 C2 0 1 1 1 C3 C2 00 00 00 00 01 01 01 01 11 11 11 11 10 10 10 10 C3 = Sign For example Bass at -10dB is obtained by the following 8 bit string: 01100010 C1 C1 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 C0 Bass C0 Treble 0 -14 1 -12 0 -10 1 -8 0 -6 1 -4 0 -2 10 10 02 14 06 18 0 10 1 12 0 14 11/14 11 Page

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