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

µF

R15 6.2K

EQRO

EQRI

C6

300pF

INR2

INPUT R

R10

600

Ω

C5

300pF

R9

600

Ω

INR1

12

13

14

15

C3

300pF

R1

600

Ω

C2

300pF

R2

600

Ω

INL1

INL2

2

3

R4

6.8K

R5

300K

C8 10nF

R3

1.2K

C1

1

µF

EQLI

EQLO

R14 6.2K

4

5

AMP1

AMP1

AMP2

AMP2

32dB

32dB

RN

RN

9

V

S

1

GND

OUTR

C12

100nF

C13 0.22

µF

20K

+V

S

R7 10K

F/RSW

11

8

7

MUTE

C9

100nF

20K

C14 0.22

µF

OUTL

EQSW

6

16

R8 10K

GND

+V

S

D94AU079

INPUT L

TEST CIRCUIT

ORDERING NUMBER: TDA7334 (DIP16)

TDA7334D (SO16)

DIP16

SO16

1/11