TDA7334 Datasheet, PDF (1/11 Pages) STMicroelectronics – LOW NOISE STEREO PREAMPLIFIER

®
TDA7334
LOW NOISE STEREO PREAMPLIFIER
DUAL CHANNEL PROCESSOR FOR PLAY-
BACK APPLICATIONS.
LOW NOISE HEAD PREAMPLIFIER
GROUND COMPATIBLE
MUTE, AUTOREVERSE METAL/NORMAL
FUNCTIONS
INTERNAL SWITCHES FOR EQUALIZATION
LOW SUPPLY CURRENT
MIXED BIPOLAR/CMOS TECHNOLOGY
DIP16
SO16
DESCRIPTION
The TDA7334 is a monolithic BICmos IC de-
signed for use in stereo cassette player systems.
The dual preamplifier contains mute, autoreverse,
metal/normal facilities for amplification of low level
signal in applications requiring very low noise per-
formance.
Each channel consists of two cascaded opera-
tional amplifiers.
The first one, AMP1, has a fixed gain of 32dB,
TEST CIRCUIT
ORDERING NUMBER: TDA7334 (DIP16)
TDA7334D (SO16)
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.
R15 6.2K
C4 10nF
EQRO 12
R13
R11 1.2K ^6.8K
C11
1µF
INPUT R
C6
300pF
R10
600Ω
C5
300pF
R12
300K
13
EQRI
INR2 14
INR1 15
R9
600Ω
INPUT L
C3
300pF
R3
1.2K
C1
1µF
INL1 2
R1
600Ω
C2
300pF
INL2 3
R2
600Ω
4
R4
6.8K
EQLI
R5
300K
5
EQLO
C8 10nF
R14 6.2K
32dB
AMP1
AMP1
32dB
RN
AMP2
AMP2
RN
D94AU079
9 ^VS
GND
1
+V_S
C12
100nF
C13 0.22µF
11 OUTR
20K
8 F/RSW
+V_S
R7 10K
7 MUTE
C9
100nF
C14 0.22µF
6 OUTL
20K
16 EQSW
+V_S
R8 10K
GND
November 1999
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