TDA7340G datasheet(2/27 Pages) STMICROELECTRONICS

2 / 27 page

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 I

2C BUS OR EXTERNALLY

CONTROLLED

Pause Detector

PROGRAMMABLE THRESHOLD

DELAY TIME DEFINED BY AN EXTERNAL

CAPACITOR

STEREO DECODER PART

FEATURES:

INTERNALLY

ADJUSTABLE

ROLL-OFF

COMPENSATION (I

2C 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

2C 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

TDA7340G

2/27

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