TDA7420 datasheet(1/29 Pages) STMICROELECTRONICS

部件名	TDA7420

功能描述	MULTIFUNCTIONAUDIO PROCESSOR

PDF	29 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 29 page

TDA7420

MULTIFUNCTION AUDIO PROCESSOR

CASSETTE PREAMPLIFIER:

FORWARD/REVERSE

INPUTS

GROUND

COMPATIBLE

INTERNAL SWITCHES FOR EQUALIZATION

INTERNAL ADJUSTMENT FOR TRAKING

INTERNAL ADJUSTMENT FOR OUTPUT

AMS:

INPUT GAIN CONTROL

ADJUSTABLE GAIN VERSUS FREQUENCY

AUDIOPROCESSOR:

INPUTS: 1 FULLY DIFFERENTIAL, 1 DIFFER-

ENTIAL, 1 STEREO AND 1 MONO

INPUT GAIN FROM 0 TO 15dB (1dB STEP)

VOLUME CONTROL FROM +16 TO -63dB

(1dB STEP)

BASS AND TREBLE CONTROL FROM -18

TO 18dB (1dB STEP)

DIRECT MUTE, SOFT MUTE AND RADIO

MUTE

FOUR INDEPENDENT OUTPUT STAGES:

- ATTENUATION CONTROL FROM

0 TO -79dB (1dB STEP)

- BEEP CONTROL (ON/OFF, FRONT/REAR)

STEREO DECODER:

ROLL-OFF ADJUSTMENT

SELECTABLE DEEMPHASIS

19KHz CANCELLATION

HIGH CUT CONTROL

STEREO BLEND

NOISE BLANKER

AUTOMATIC THRESHOLD CONTROL AND

PROGRAMMABLE TRIGGER THRESHOLD

INTEGRATED HIGH PASS FILTER

PACKAGE: TQFP64 (14x14)

DESCRIPTION

The TDA7420 I

2C bus controlled multifunction

audio processor contains all signal processing

blocks of a high performance car radio, including

audioprocessor, stereodecoder, noise blanker,

different mute functions, cassette preamplifier and

AMS function.

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.

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.

Very low DC stepping is obtained by use of the

BICMOS technology.

May 1998

®

ORDERING NUMBER: TDA7420

TQFP 64 (14x14)

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