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PDF BA3308FV Data sheet ( Hoja de datos )

Número de pieza BA3308FV
Descripción Preamps
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Audio Accessory ICs
Preamps with Built-in ALC
BA3308F,BA3308FV
No.11087ECT01
Description
The BA3308F/FV is a dual preamplifier for recording and playback with ALC (auto level control), developed for stereo radio,
cassette recorders, tape recorders, and other pre amplifiers audio applications.
ALC circuit has a build in rectification circuit with wide adjustable dynamic range, high gain, low distortion amplifiers with
direct coupling and mute circuit, used to cut off pop noise during power on.
Available in SOP14, or SSOP-B14 Packages.
Features
1) Built-in ALC rectification diode
2) Wide operating power supply voltage range (VCC=4.5~14 V)
3) Low current consumption (IQ=3.5mA)
4) High gain (GVO=80dB)
5) Low distortion (THD=0.1%)
6) Low noise (VNIN=1 μVrms)
7) Input coupling capacitor not needed
8) Good ALC channel balance
9) Built-in power supply mute circuit
10) Dynamic range of ALC can be changed by attaching input resistance.
Applications
Stereo radio, cassette tape recorders, stereo cassette decks, home stereos, music centers, etc.
Line up matrix
Part No.
Package
BA3308F
SOP14
BA3308FV
SSOP-B14
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/9
2012.06 - Rev.C

1 page




BA3308FV pdf
BA3308F,BA3308FV
Description of operations
1. Recording
1) Record amplifier
The BA3308F/FV amplifier of ch1 and ch2 input stage
(13pin, 9pin) can be direct coupled or use coupling
capacitors (C1/C2). The voltage gain of the record amplifier
is determined by GV=R5/R3. The R5/R6, and C3/R3 regulate
control of the pop noise that occurs at power-on (see
“Cautions on use”) and direct current bias fed back is set by
R5/R6 and C5/C6 at the output stage.
Technical Note
BA3308
13(29)(8)
11(101) (9)
R1
(R2)
3.9k
C1
(C2)
10F
INPUT
R3
(R4)
39
C3
(C4)
100F
Cont
ch1
(ch2)
ch2
(ch1)
ch2
(ch1)
R5
(R6)
18k
31 (7)
C5
(C6)
10F
45
C7
(C8)
22F
R7
(R8)
1M
OUTPUT
FiFgi.g1.45
2) ALC
The BA3308F/FV has an on-chip signal rectifier and electronic
volume needed for ALC. The signal rectifier compares the direct
current output voltage that is superposed in the output stage (1, 7pin)
signal to the reference voltage 4.5VF (3V; 1VF is approximately
0.7V) in the comparator circuit and if the output voltage is higher, it
turns the comparator ON to charge the smoothing capacitor C7.
Since the operation point of the output stage of amplifier ch1 and ch2
is fixed at 3VF, the comparator turns ON when the peak value of the
signal output voltage is 1.5VF (effective value approx. 0.75V). Once
the direct current signal for electronic volume is controlled, ALC VOUT (DCAC)
operation starts. The electronic volume, which is connected between
the input line (13, 9pin) and GND, causes the input signal to 3VF
attenuate according to the ratio of the external resistance (R1, R2) to
the resistance value of the electronic volume. The ALC range varies
according to the values of R1 and R2. For small ALC variation the
S/N will determinate an adequate ALC range is obtained by applying
several kof the R1 and R2. The attack time and recovery time of
ALC are set according to C7 and R7 of 4pin. If the time constants
(C7, R7) are large, the recovery time will be long and as C7 becomes
smaller, and the attack time will be shorter.
ch1
(ch2)
4.5VF
1 (7)
3 (7)
ch2
(ch1)
ch2
(ch1)
Comp
Cont
BA3308
4 13(9)
5 2 (8)
R7 C7
R1
(R2)
Fig.15
Fig.6
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/9
2012.06 - Rev.C

5 Page





BA3308FV arduino
Datasheet
Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002

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