ba3402 ROHM Co. Ltd., ba3402 Datasheet

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ba3402

Manufacturer Part Number
ba3402
Description
Dual-channel, Auto-reverse Tape Preamplifier
Manufacturer
ROHM Co. Ltd.
Datasheet
The BA3402 is a dual preamplifier developed for auto-reverse car tape decks. An electronic switch on the chip switches
between the forward and reverse heads, and this has the benefits of greater reliability, easier wiring, lower space require-
ments, and improved assembly efficiency when compared with conventional mechanical switches. The circuit is de-
signed in such a way that coupling capacitors are not required. In addition to reducing the number of external compo-
nents required, this ensures that the head is not magnetized when the power is applied.
FApplications
Car stereos and play-only auto-reverse cassette decks.
FFeatures
1) Low noise (V
2) High open loop gain (G
3) Reliable electronic switch on the chip. Head switch-
4) Input-side virtual-ground design means that input
FBlock diagram
226
Dual-channel, auto-reverse
tape preamplifier
BA3402
Audio ICs
ing for both left and right channels is possible with the
addition of one external switch circuit.
coupling capacitors are not required.
NIN
= 1.2 Vrms).
VO
= 85dB).
5) Built-in bias circuit reduces attached component re-
6) Low “pop” noise during head switching.
7) Emitter-follower output circuit with large drive capac-
8) Pin layout allows easy PCB design.
9) Compact package allows high PCB wiring density.
quirements.
ity.

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ba3402 Summary of contents

Page 1

... BA3402 The BA3402 is a dual preamplifier developed for auto-reverse car tape decks. An electronic switch on the chip switches between the forward and reverse heads, and this has the benefits of greater reliability, easier wiring, lower space require- ments, and improved assembly efficiency when compared with conventional mechanical switches. The circuit is de- signed in such a way that coupling capacitors are not required ...

Page 2

... Audio ICs FInternal circuit configuration FAbsolute maximum ratings (Ta = 25_C) FElectrical characteristics (unless otherwise noted 25_C and V = 8V) CC BA3402 227 ...

Page 3

... Audio ICs FMeasurement circuit FApplication example 228 BA3402 ...

Page 4

... Audio ICs FElectrical characteristics curves BA3402 229 ...

Page 5

... Coupling capacitors are required when the pream- plifier output is used directly as the deck output with no via a resistor, CC tone control, or when it is connected directly to power am- plifier. BA3402 pull- ...

Page 6

... Audio ICs (4) Capacitor for prevention of oscillation and RF mix- ing With the BA3402, a capacitor must be connected be- tween each input pin and the bias pins to prevent oscilla- tion and RF mixing. The recommended value for this ca- pacitor is 1000pF to 2000pF too small, oscillation and RF noise can adversely influence circuit perfor- mance ...

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