PDF TDA7342 Data sheet ( Hoja de datos )

Número de pieza	TDA7342
Descripción	DIGITALLY CONTROLLED AUDIO PROCESSOR
Fabricantes	ST Microelectronics
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No Preview Available ! ® TDA7342 DIGITALLY CONTROLLED AUDIO PROCESSOR INPUT MULTIPLEXER - TWO STEREO AND ONE MONO INPUTS - ONE QUASI DIFFERENTIAL INPUT - SELECTABLE INPUT GAIN FOR OPTIMAL ADAPTATION TO DIFFERENT SOURCES FULLY PROGRAMMABLE LOUDNESS FUNCTION VOLUME CONTROL IN 0.3dB STEPS IN- CLUDING GAIN UP TO 20dB ZERO CROSSING MUTE, SOFT MUTE AND DIRECT MUTE BASS AND TREBLE CONTROL FOUR SPEAKER ATTENUATORS - FOUR INDEPENDENT SPEAKERS CONTROL IN 1.25dB STEPS FOR BALANCE AND FADER FACILITIES - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SE- RIAL I2 CBUS DESCRIPTION The audioprocessor TDA7342 is an upgrade of the TDA731X audioprocessor family. Due to a highly linear signal processing, using CMOS-switching techniques instead of standard TQFP 32 ORDERING NUMBER: TDA7342 bipolar multipliers, very low distortion and very low noise are obtained. Several new features like softmute, and zero-crossing mute are imple- mented. The soft Mute function can be activated in two ways: 1 Via serial bus (Mute byte, bit D0) 2 Directly on pin 21 through an I/O line of the microcontroller Very low DC stepping is obtained by use of a BICMOS technology. November 1999 1/14 1 page TDA7342 ELECTRICAL CHARACTERISTICS (continued.) Symbol Parameter ZERO CROSSING MUTE VTH Zero Crossing Threshold (note 1) AMUTE VDC Mute Attenuation DC Step SOFT MUTE AMUTE Mute Attenuation TDON ON Delay Time TDOFF OFF Current VTHSM RINT VSMH VSML Soft Mute Threshold Pullup Resistor (pin 21) (pin 21) Level High (pin 21) Level Low BASS CONTROL BBOOST BCUT Astep Max Bass Boost Max Bass Cut Step Resolution Rg Internal Feedback Resistance TREBLE CONTROL CRANGE Control Range Astep Step Resolution SPEAKER ATTENUATORS CRANGE Astep AMUTE Control Range Step Resolution Output Mute Attenuation EA Attenuation Set Error VDC DC Steps AUDIO OUTPUT Vclip Clipping Level RL Output Load Resistance RO Output Impedance VDC DC Voltage Level Test Condition WIN = 11 WIN = 10 WIN = 01 WIN = 00 0dB to Mute CCSM = 22nF; 0 to -20dB; I = IMAX CCSM = 22nF; 0 to -20dB; I = IMIN VCSM = 0V; I = IMAX VCSM = 0V; I = IMIN (note 2) Soft Mute Active Data Word = XXX11111 Adjacent Attenuation Steps d = 0.3% Min. 80 45 0.7 20 25 1.5 35 3.5 15 -8.5 1 45 ±13 1 35 0.5 80 2.1 2 3.5 Typ. 20 40 80 160 100 0 60 1 35 50 1 2.5 50 18 -10 2 65 ±14 2 37.5 1.25 100 0 2.6 30 3.8 Max. Unit mV mV mV mV dB 3 mV dB 1.7 ms 55 ms 75 µA µA 3.5 V 65 KΩ V 1V 20 -11.5 3 85 dB dB dB KΩ ±15 dB 3 dB 40 2.00 1.25 3 dB dB dB dB mV Vrms KΩ 100 Ω 4.1 V 5/14 5 Page TDA7342 Bass Treble 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 0010 0011 0100 0101 0110 0111 1111 1110 1101 1100 1011 1010 1001 1000 0001 0000 FUNCTION TREBLE STEP -14dB -12dB -10dB -8dB -6dB -4dB -2dB 0dB 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB BASS STEPS -10dB -8dB -6dB -4dB -2dB 0dB 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB 146B 18dB For example 12dB Treble and -8dB Bass give the following DATA BYTE: 0 0 1 1 1 0 0 1 11/14 11 Page

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