ROHM BA3308F Technical data
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 (V
3) Low current consumption (I
4) High gain (G
5) Low distortion (THD=0.1%)
6) Low noise (V
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 SOP14 SSOP-B14
VO=80dB)
NIN=1 Vrms)
Q=3.5mA)
BA3308F BA3308FV
CC=4.5~14 V)
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© 2011 ROHM Co., Ltd. All rights reserved.
2012.06 - Rev.C
BA3308F,BA3308FV
●Absolute maximum ratings(Ta=25℃)
Parameter Symbol Limits Unit
Supply voltage VCC 16 V
Power
dissipation
BA3308F
BA3308FV 350*2
Pd
Operating temperature Topr
Storage temperature Tstg
－55～＋125 ℃
*1
450
mW
－25～＋75 ℃
*1 Reduce by 4.5 mW/C over 25C, when mounted on a 70mm×70mm×1.6mm PCB board.
2
Reduce by 3.5 mW/C over 25C
*
●Operating conditions(Ta=25℃)
Technical Note
Parameter Symbol
Min. Typ. Max. Unit
Supply voltage VCC 4.5 - 14 V
Note: This IC is not designed to be radiation-resistant.
●Electrical characteristics(Unless otherwise noted, Ta=25℃, Vcc=7.0V, f=1kHz, BPF20～20kHz)
Parameter Symbol Min. Typ. Max. Unit Conditions
Quiescent current IQ 1.5 3.5 4.5 mA VIN=0V
Open loop voltage gain GVO 70 80 - dB V
OUT
Total harmonic distortion THD - 0.1 0.3 % NAB34dB, V
Fig.17
rms
=-10dBV Fig.17
OUT
=40mV
Fig.17
rms
Input resistance RIN 15 25 45 k Fig.17
Maximum output voltage VOM 0.6 1.2 - V
Input conversion noise
voltage
V
- 1 2 V
NIN
ALC range ALC 40 45 - dB
THD=1% Fig.17
rms
Rg=2.2k, referenced to NAB 34dB
rms
at 1kHz
Rg=3.9 k, VIN＝-70 dBV standard,
THD=3%
ALC channel balance ALC - 0 2.5 dB VIN=-60dBV,-30dBV Fig.17
Channel separation CS 60 75 - dB VO=0dBV, NAB 34dB Fig.17
Test
Circuit
Fig.17
Fig.17
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© 2011 ROHM Co., Ltd. All rights reserved.
2012.06 - Rev.C
BA3308F,BA3308FV
●Block diagram
BA3308F/FV
OUTPUT1
GND
N.C.
ALC
V
CC
N.C.
OUTPUT2
Technical Note
1
2
3
4
5
V
cc
6
7
ALC
14
13
12
11
10
9
8
N.C.
INPUT1
N.C.
NF1
NF2
INPUT2
N.C.
Fig.1
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© 2011 ROHM Co., Ltd. All rights reserved.
2012.06 - Rev.C
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