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,
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.
November 1999
R12
300K
R13
6.8K
C4 10nF
R11 1.2K
C11
1
F
R15 6.2K
EQRO
EQRI
C6
300pF
INR2
INPUT R
R10
600
C5
300pF
R9
600
INR1
12
13
14
15
C3
300pF
R1
600
C2
300pF
R2
600
INL1
INL2
2
3
R4
6.8K
R5
300K
C8 10nF
R3
1.2K
C1
1
F
EQLI
EQLO
R14 6.2K
4
5
AMP1
AMP1
AMP2
AMP2
32dB
32dB
RN
RN
9
V
S
1
GND
OUTR
+V
S
C12
100nF
C13 0.22
F
20K
+V
S
R7 10K
F/RSW
11
8
7
MUTE
C9
100nF
20K
C14 0.22
F
OUTL
EQSW
6
16
R8 10K
GND
+V
S
D94AU079
INPUT L
TEST CIRCUIT
ORDERING NUMBER: TDA7334 (DIP16)
TDA7334D (SO16)
DIP16
SO16
1/11
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
12
V
P
tot
Total Power Dissipation
1
W
T
op
Operating Temperature Range
-40 to 85
C
T
stg
Storage Temperature Range
-40 to 150
C
THERMAL DATA
DIP 16
SO16
R
th j-pins
Thermal resistance junction-pins
100
200
C/W
PIN CONNECTION (Top view)
TDA7334
2/11
R12
300K
R13
6.8K
C7 10nF
R11 1.2K
C11
1
F
R15 6.2K
EQRO
EQRI
INR2
INPUT R
INR1
12
13
14
15
INL1
INL2
2
3
R4
6.8K
R5
300K
C8 10nF
R3
1.2K
C1
1
F
EQLI
EQLO
R14 6.2K
4
5
AMP1
AMP1
AMP2
AMP2
32dB
32dB
RN
RN
9
V
S
1
GND
OUTR
+V
S
C12
100nF
C13 0.22
F
V
S
R7 30K
F/RSW
11
8
7
MUTE
C9
0.68
F
C14 0.22
F
OUTL
EQSW
6
16
D94AU080
INPUT L
TR2
1K
TR1 1K
C10
0.68
F
GND
R6 30K
R8 30K
V
S
GND
C4
0.68
F
Application Circuit
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DC (V)
GND
0
0
3.6
3.6
3.6
8.0
N.C.
3.6
3.6
3.6
0
0
P.C. Board and component layout of the Application Circuit (1:1 scale)
TDA7334
3/11
ELECTRICAL CHARACTERISTICS (V
S
= 8V;R
IN
= 600
; f = 1KHz; T
amb
= 25
C; unless other-
wise specified (see figure 2)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
6
8
11
V
I
S
Supply Current
7.5
9.0
mA
SVR
Ripple Rejection
Input referred (ripple = 1V)
105
dB
MUTE
th
Mute (Pin 7)
OFF
ON
0
3.5
0.8
V
S
V
V
MUTE
A
Mute Attenuation
60
80
dB
R
I
Input Resistance
100
K
V
out DC
Output Voltage DC
3.2
3.6
4.2
V
I
I
Input Bias Current
10
A
G
VO
Open Loop Gain
f = 400Hz
110
dB
G
V
Closed Loop Gain
NAB short
30
31
32.5
dB
G
V
Closed Loop Gain Match
NAB short
-1
1
dB
V
OM
Signal Handling
THD = 1%, V
CC
= 7.6V
1.8
2.0
Vrms
R
N
Resistance Normal Position
100
300
S
R
Slew Rate
NAB Short
1
V/
s
e
N
Total Input Noise
R
IN
= 600
; unweighted
0.8
V
R
IN
= 600
; A weighted
0.5
V
R
IN
= 0
;
unweighted
0.45
V
R
O
Output Resistance
1
K
F/R
l
Rev. Low Level (pin 8)
IN2 = ON; IN1 = OFF
0
0.8
V
F/R
h
Forward High Level (pin 8)
IN2 = OFF; IN1 = ON
3.5
V
S
V
EQ
l
Normal Low Level (pin 16)
0
0.8
V
EQ
h
Metal High Level (pin 16)
3.5
V
S
V
THD
Total Harmonic Distortion
V
O
= 1V; f = 1KHz metal
0.02
%
V
O
= 1V; f = 1KHz normal
0.02
0.1
%
V
O
= 1V; f = 10KHz metal
0.05
%
V
O
= 1V; f = 10KHz normal
0.04
%
SVR
1
Ripple Rejection
NAB short
75
dB
C
S
Channel Separation (L to R)
45
60
dB
C
CT
Channel Cross talk (F to R)
60
80
dB
S/N
Signal to Noise
V
O
= 388mV; metal
63
dB
TDA7334
4/11
Figure 1: Quiescent Current vs. Supply
Figure 2: D.C. Output vs. Supply Voltage
Figure 3: Forward/Reverse Threshold
Figure 4: Metal/Normal Threshold
Figure 5: Mute Threshold
Figure 6: Mute Attenuation vs. Frequency
TDA7334
5/11
Figure 7: Mute Attenuation vs. Output Level
Figure 8: THD vs. Frequency
Figure 9: THD + N vs. Frequency
Figure 10: THD vs. Supply Voltage
Figure 11: Load Characteristic
Figure 12: Signal Handling vs. Supply Voltage
TDA7334
6/11
Figure 13: Total Input Noise vs. Input Resistance
Figure 14: Cross Channel vs. Frequency
Figure 15: Cross Talk vs. Frequency
Figure 16: SVR vs. Frequency
Figure 17: SVR vs. Frequency
Figure 18: Power Bandwidth
TDA7334
7/11
Figure 19: Voltage Gain vs. Input Voltage
Figure 20: NAB Network
TDA7334
8/11
DIP16
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
a1
0.51
0.020
B
0.77
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
3.3
0.130
Z
1.27
0.050
OUTLINE AND
MECHANICAL DATA
TDA7334
9/11
SO16 Narrow
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
1.75
0.069
a1
0.1
0.25
0.004
0.009
a2
1.6
0.063
b
0.35
0.46
0.014
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.020
c1
45
(typ.)
D (1)
9.8
10
0.386
0.394
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
8.89
0.350
F (1)
3.8
4
0.150
0.157
G
4.6
5.3
0.181
0.209
L
0.4
1.27
0.016
0.050
M
0.62
0.024
S
(1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch).
OUTLINE AND
MECHANICAL DATA
8
(max.)
TDA7334
10/11
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parti es which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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1999 STMicroelectronics Printed in Italy All Rights Reserved
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TDA7334
11/11
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