廬
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
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
R15 6.2K
C4 10nF
DIP16
SO16
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.
EQRO
R12
300K
EQRI
12
RN
13
9
V
S
C12
100nF
+V
S
R11 1.2K
C11
1碌F
INPUT R
C6
300pF
R13
6.8K
1
32dB
GND
INR2
R10
600鈩?/div>
C5
300pF
INR1
R9
600鈩?/div>
14
15
AMP1
AMP2
11
OUTR
C13 0.22碌F
20K
8
F/RSW
R7 10K
+V
S
INPUT L
C3
300pF
R1
600鈩?/div>
C2
300pF
INL1
INL2
R2
600鈩?/div>
2
3
7
AMP1
AMP2
MUTE
C9
100nF
32dB
4
6
RN
5
16
EQSW
OUTL
C14 0.22碌F
R3
1.2K
C1
1碌F
R4
6.8K
R5
300K
C8 10nF
EQLI
20K
EQLO
GND
D94AU079
R8 10K
+V
S
R14 6.2K
November 1999
1/11
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