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TDA7335 Datasheet

  • TDA7335

  • STEREO PREAMP AMS DOLBY B* NOISE REDUCTION PROCESSOR

  • 20頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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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
(388.2mV
RMS
)
MINIMUM NUMBER OF EXTERNAL COMPO-
NENTS
LOW SUPPLY CURRENT (18mA)
MIXED BIPOLAR/CMOS TECHNOLOGY
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.
* 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
SDIP30
ORDERING NUMBER:
TDA7335
PIN CONNECTION
(Top view)
1/20

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