217
Audio ICs
Dual preamplifier with ALC detector
circuit
BA3313L
The BA3313L is a dual preamplifier IC with built-in ALC detector circuit, designed for use in stereo radio cassette record-
ers. It comes in a compact 12-pin ZIP package, and has two record/playback preamplifiers, and an ALC detector circuit.
The preamplifiers can be directly coupled to the tape head without coupling capacitors to prevent tape head magnetiza-
tion and “pop” noise generation.
With the built-in ALC detector circuit, an ALC circuit with large dynamic range can be constructed with addition of just
an external time constant circuit.
Applications
Stereo radio cassette recorders
Features
1) Input bias circuit does not require coupling capaci-
tors.
2) Built-in ALC circuit with external time constant circuit.
3) Wide operating power supply voltage range.
4) High gain.
5) Low noise.
Block diagram
218
Audio ICs BA3313L
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V and f= 1kHz)
219
Audio ICs BA3313L
Measurement circuit
220
Audio ICs BA3313L
Application example
Operation notes (the resistor marked with an asterisk)
Changing the input resistor Rg, and the ALC time
constant influences the ALC transient characteristics. In
particular, if Rg is less than 3.9kΩ or the time constant ca-
pacitor is less than 47µF, the ALC may operate exces-
sively. Do not use smaller values than those recom-
mended for these components.
External dimensions (Units: mm)
221
Audio ICs BA3313L
Electrical characteristics curve
Appendix
Appendix1-Rev1.0
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
