PDF TDA7312 Data sheet ( Hoja de datos )

Número de pieza	TDA7312
Descripción	DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
Fabricantes	ST Microelectronics
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No Preview Available ! ® TDA7312 DIGITAL CONTROLLED STEREO AUDIO PROCESSOR INPUT MULTIPLEXER: - 4 STEREO INPUTS FOUR SELECTABLE ADDRESSES TWO DIGITAL CONTROL OUTPUTS INPUT AND OUTPUT FOR EXTERNAL EQUALIZER OR NOISE REDUCTION SYS- TEM VOLUME CONTROL IN 1.25dB STEPS TREBLE AND BASS CONTROL TWO SPEAKER ATTENUATORS: - INDEPENDENT SPEAKERS CONTROL IN 1.25dB STEPS - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SE- RIAL I2C BUS DESCRIPTION The TDA7312 is a volume, tone (bass and treble) balance (Left/Right) processor for quality audio appli- cations. SDIP30 ORDERING NUMBER: TDA7312 Control is accomplished by serial I2C bus microproc- essor 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 1/13 1 page TDA7312 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 ADDRESS PIN (Internal 50KΩ pull down resistor). 1V 3V -5 +5 µA 0.4 V Notes: SDA, SCL, DIG OUT 1, DIG OUT 2 Pins are high impedance when VS = 0 (1) Bass and Treble response see attached diagram (fig.16). 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 5/13 5 Page Audio Switch MSB 0 1 TDA7312 LSB FUNCTION 0 D2 D1 S2 S1 S0 Audio Switch 1 0 0 Stereo 1 1 0 1 Stereo 2 1 1 0 Stereo 3 1 1 1 Stereo 4 0 1 0 1 DIG. OUT 1 = 0 DIG. OUT 1 = 1 DIG. OUT 2 = 0 DIG. OUT 2 = 1 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 Status at Power on Reset Volume = 78.75dB Treble = Bass = +2dB Spkrs Attenuators = Mute Input = Stereo 1 Dig. OUT 1 = Dig. OUT 2 = 1 11/13 11 Page

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