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TDA7335
STEREO PREAMP + AMS + DOLBY B* NOISE REDUCTION PROCESSOR
TDA7335STEREO 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
DESCRIPTIONThe 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.
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN FUNCTIONS(2) Internal pull-up resistor (digital high level if pin left open)
TDA7335
Figure 1: Application Circuit
TDA73353/20
Figure 1a: Components & Top Copper Layer of the Fig. 1 (1:1 scale).
Figure 1b: Bottom Copper Layer of the Fig. 1 (1:1 scale).
TDA7335
TEST CIRCUIT
TDA73355/20
