TDA7340G Datasheet, PDF (2/27 Pages) STMicroelectronics – AUDIO SIGNAL PROCESSOR

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
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