TDA7335 查看數據表（PDF） - STMicroelectronics

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TDA7335

STEREO PREAMP + AMS + DOLBY B* NOISE REDUCTION PROCESSOR

STMicroelectronics 

®

TDA7335

STEREO PREAMP + AMS + DOLBY B*

NOISE REDUCTION PROCESSOR

DUAL CHANNEL PROCESSOR FOR PLAY-

BACK APPLICATIONS.

STEREO DOLBY B NR SYSTEM

LOW NOISE HEAD PREAMPLIFIER

MUTE, AUTOREVERSE, AMS (AUDIO MU-

SIC SENSOR) FUNCTIONS

INTERNAL SWITCHES FOR EQUALIZATION

DOLBY REFERENCE LEVEL -6dBm

(388.2mVRMS)

MINIMUM NUMBER OF EXTERNAL COMPO-

NENTS

LOW SUPPLY CURRENT (18mA)

MIXED BIPOLAR/CMOS TECHNOLOGY

SDIP30

ORDERING NUMBER: TDA7335

DESCRIPTION

The TDA7335 is a monolithic BICmos IC de-

signed for use in stereo cassette player systems.

The device includes two separate audio channels

composed by low noise preamplifier, Dolby B

noise reduction system and Audio Music Sensor.

The dual preamplifier contains mute, autoreverse,

metal/normal facilities for amplification of low level

signal in applications requiring very low noise per-

formances.

Each channel consists of two cascaded opera-

tional amplifiers.

The first one, AMP1, has a fixed gain of 36dB,

low noise forward/reverse switchable input, and

allows magnetic heads connection directly to

ground. The second one, AMP2, is a standard op-

erational amplifier whose equalizing external

components fix the frequency response.

The Audio Music Sensor circuit detects the inter-

program space and then the starting point of mu-

sical programs (the interprogram time and pro-

gram detection time are externally selectable).

The device contains Dolby B decoder NR chains

requiring very few external components and do

not require coils.

PIN CONNECTION (Top view)

* Dolby B and the Double-D symbol are

trademarks of Dolby Laboratories Li-

censing Corporation, San Francisco,

California 94103-4813, USA.

This device is available only to Licens-

ing and application information may be

obtained from Dolby Lab.

November 1999

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