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STMicroelectronics Electronic Components Datasheet

6764 Datasheet

AUDIO SIGNAL PROCESSOR

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® TDA7340G
AUDIO SIGNAL PROCESSOR
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 IN-
DEPENDENT ATTENUATION CONTROL
STEREODECODER:
ROLL-OFF ADJUSTMENT
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
DEVIATION AND FIELD STRENGTH DE-
PENDENT TRIGGER ADJUSTMENT
PAUSE DETECTOR:
PROGRAMMABLE THRESHOLD
ALLFUNCTIONS PROGRAMMABLEVIA I2C BUS
DESCRIPTION
The TDA7340G I2C bus controlled audio signal
processor contains all signal processing blocks of
PQFP44
ORDERING NUMBER: TDA7340G
a high performance car radio, including audio-
processor, stereodecoder, noise blanker, pause
detector and different mute functions.
The use of BICMOS technology allows the imple-
mentation of several filter functions with switched
capacitor techniques like fully integrated, adjust-
ment free PLL Loop filter, pilot detector with inte-
grator and pilot cancellation.
This minimizes the number of external compo-
nents.
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.
September 1999
1/27


STMicroelectronics Electronic Components Datasheet

6764 Datasheet

AUDIO SIGNAL PROCESSOR

No Preview Available !

TDA7340G
AUDIO PROCESSOR PART
FEATURES:
Input Multiplexer:
DIFFERENTIAL CD STEREO INPUT
CASSETTE STEREO INPUT
FM STEREO INPUT FROM STEREODE-
CODER
AM INPUT:
MONO OR STEREO MODE (PROGRAMMA-
BLE)
BEEP INPUT (ONLY IN AM MONO MODE)
TELEPHONE DIFFERENTIAL MONO INPUT
GAIN PROGRAMMABLE IN 3 x 3.75dB
STEPS
Loudness:
FULLY PROGRAMMABLE
15 x 1.25dB STEPS
Volume Control:
1.25dB COARSE ATTENUATOR
0.31dB FINE ATTENUATORS
MAX GAIN 20dB
MAX ATTENUATION 59.7dB (PLUS LOUD-
NESS)
Bass Control
±7 x 2dB STEPS
2nd ORDER SYMMETRICAL OR NON SYM-
METRICAL CUT FREQUENCY RESPONSE
Treble Control
±7 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 PROGRAM-
MABLE THRESHOLD
SOFT MUTE WITH EXTERNAL DEFINED
SLOPE
SOFT MUTE VIA I2C BUS OR EXTERNALLY
CONTROLLED
Pause Detector
PROGRAMMABLE THRESHOLD
DELAY TIME DEFINED BY AN EXTERNAL
CAPACITOR
STEREO DECODER PART
FEATURES:
INTERNALLY ADJUSTABLE ROLL-OFF
COMPENSATION (I2C BUS CONTROLLED)
INTEGRATED PILOT CANCELLATION
ON CHIP FILTER FOR PILOT DETECTOR
AND PLL
ADJUSTMENT FREE VOLTAGE CONTROL-
LED OSCILLATOR
AUTOMATIC
PILOT
DEPENDENT
MONO/STEREO SWITCHING
VERY HIGH INTERMODULATION AND IN-
TERFERENCE SUPPRESSION
I2C 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 EX-
TERNAL CAPACITOR
VERY LOW OFFSET CURRENT DURING
HOLD TIME DUE TO OPAMPS WITH MOS
INPUTS
LEVEL INPUT FOR ADDITIONAL SPIKE DE-
TECTION ON FIELD STRENGTH WITH IN-
TERNAL 1st ORDER + 20KHz HIGH PASS
FILTER
NOISE RECTIFIER OUTPUT FOR QUALITY
DETECTION
CIRCUITS FOR DEVIATION AND FIELD
STRENGTH DEPENDENT TRIGGER AD-
JUSTMENT
2/27


Part Number 6764
Description AUDIO SIGNAL PROCESSOR
Maker STMicroelectronics
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6764 Datasheet PDF






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