Details, datasheet, quote on part number: TDA7340S
PartTDA7340S
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Features, Applications

AUDIOPROCESSOR: MUTE, SOFT MUTE AND ZERO CROSSING MUTE ONE DIFFERENTIAL, TWO STEREO AND TWO MONO INPUTS DIFFERENTIAL PHONE INPUT VOLUME, BASS, TREBLE AND LOUDNESS CONTROL FOUR SPEAKER ATTENUATORS WITH INDEPENDENT ATTENUATION CONTROL STEREODECODER: ADJUSTMENT FREE INTEGRATED 456KHz VCO HIGH CUT CONTROL STEREO BLEND NOISE BLANKER: INTEGRATED HIGH-PASS FILTER NOISE RECTIFIER OUTPUT FOR QUALITY DETECTION PROGRAMMABLE TRIGGER THRESHOLD PAUSE DETECTOR: PROGRAMMABLE THRESHOLD ALLFUNCTIONS PROGRAMMABLEVIA I2C BUS DESCRIPTION The TDA7340 I2C bus controlled audio signal processor contains all signal processing blocks of a high performance car radio, including audioprocessor, stereodecoder, noise blanker, pause

detector and different mute functions. The use of BICMOS technology allows the implementation of several filter functions with switched capacitor techniques like fully integrated, adjustment free PLL Loop filter, pilot detector with integrator and two 19KHz notch filters. This minimizes the number of external components. Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained also in the stereodecoder part. The audioprocessor contains several new features like softmute, zero-crossing mute and pause detector. Very low Dc stepping is obtained by use of a BICMOS technology.

AUDIO PROCESSOR PART FEATURES: Input Multiplexer: DIFFERENTIAL CD STEREO INPUT CASSETTE STEREO INPUT FM STEREO INPUT FROM STEREODECODER AM INPUT: MONO OR STEREO MODE (PROGRAMMABLE) BEEP INPUT (ONLY IN AM MONO MODE) TELEPHONE DIFFERENTIAL MONO INPUT GAIN PROGRAMMABLE x 3.75dB STEPS Loudness: FULLY PROGRAMMABLE x 1.25dB STEPS Volume Control: 1.25dB COARSE ATTENUATOR 0.31dB FINE ATTENUATORS MAX GAIN 20dB MAX ATTENUATION 59.7dB (PLUS LOUDNESS) Bass Control x 2dB STEPS 2nd ORDER SYMMETRICAL OR NON SYMMETRICAL FREQUENCY RESPONSE (PROGRAMMABLE) Treble Control x 2dB STEPS Speaker Control 4 INDEPENDENT SPEAKER CONTROL IN 1.25dB STEPS CONTROL RANGE 37.5dB INDEPENDENT SPEAKER MUTE Mute Functions DIRECT MUTE ZERO CROSSING MUTE WITH PROGRAMMABLE THRESHOLD SOFT MUTE WITH EXTERNAL DEFINED SLOPE Pause Detector PROGRAMMABLE THRESHOLD DELAY TIME DEFINED BY AN EXTERNAL CAPACITOR STEREO DECODER PART FEATURES: INTEGRATED 19KHZ NOTCH FILTER FOR PILOT CANCELLATION ON CHIP FILTER FOR PILOT DETECTOR AND PLL ADJUSTMENT FREE VOLTAGE CONTROLLED OSCILLATOR AUTOMATIC PILOT DEPENDENT MONO/STEREO SWITCHING VERY HIGH INTERMODULATION AND INTERFERENCE SUPPRESSION I C BUS CONTROLLED (STD OFF, FORCED MONO, STEREO) HIGH CUT CONTROL STEREO BLEND NOISE BLANKER PART FEATURES: INTERNAL 2nd ORDER HIGH-PASS FILTER NOISE RECTIFIER OUTPUT FOR SIGNAL QUALITY DETECTION PROGRAMMABLE TRIGGER THRESHOLD TRIGGER THRESHOLD DEPENDENT ON HIGH FREQUENCY NOISE BLANKING TIME PROGRAMMABLE BY EXTERNAL CAPACITOR VERY LOW OFFSET CURRENT DURING HOLD TIME DUE TO OPAMPS WITH MOS INPUTS LEVEL INPUT FOR ADDITIONAL SPIKE DETECTION ON FIELD STRENGTH

IN L BIN L BOUT L LOUD L OUT LR MUTE VOLUME + LOUDNESS BASS TREBLE SOFT MUTE OUT LF OUT RR OUT RF PAUSE I2C BUS LOUD R CSM BIN R BOUT TR R OUT LR OUT LF OUT RR OUT RF SCL SDA DIGGND 6.2K R2

1nF C13 HIGH CUT CONTROL C14 HP PEAK DETECTOR LEVEL CONTROL PULSE FORMER

CREF 47nF C15 field strength PAUSE LEVEL PEAK 47nF C16 TBLANK 100K R3 VSB 47K R4 reflevel level 68K R5 VHCC

NETWORK TO BE ADAPTED TO THE SPECIFIC REQUESTS FOR STEREO BLEND AND HIGH CUT CONTROL

 

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