BA3308F Rohm, BA3308F Datasheet

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BA3308F

Manufacturer Part Number
BA3308F
Description
Dual preamplifier with ALC
Manufacturer
Rohm
Datasheet

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Audio ICs
Dual preamplifier with ALC
BA3308 / BA3308F
The BA3308 and BA3308F are dual preamplifier ICs with built-in ALC circuits, and have been designed for use in stereo
radio-cassette recorders and tape recorders. They come in compact 9-pin SIP (BA3308) and 14-pin MF (BA3308F)
packages, and have two record / playback preamplifiers, and an ALC circuit. The preamplifiers have high gain and low
distortion, and can be directly coupled to the tape head without coupling capacitors. This prevents tape head
magnetization and “pop” noise generation.
A built-in rectifier means that an ALC circuit with good channel balance and large dynamic range can be constructed with
addition of just an external time constant circuit.
The ICs also include power-on mute circuits that suppress “pop” noise generation.
Stereo radio cassette recorders, cassette decks and home stereo systems and music centers
10) ALC dynamic range can be varied by the addition of an external input resistor.
Operating temperature
Storage temperature
Power supply voltage
Power dissipation
When it is used below Ta=0 C,please use it within the range of operating power supply voltage1.
1) Built-in ALC rectifier diode.
2) Wide operating power supply voltage range (V
3) Low current dissipation (I
4) High gain (G
5) Low distortion (THD=0.1%)
6) Low noise (V
7) Input coupling capacitors and not necessary.
8) Good ALC channel balance.
9) Power-on mute circuit.
Power supply voltagerange 1
Power supply voltagerange 2
Applications
Features
Absolute maximum ratings (Ta=25°C)
Recommended operating conditions (Ta=25°C)
1 Reduced by 9.5mW for each increase in Ta of 1 C over 25 C.
2 Reduced by 4.5mW for each increase in Ta of 1 C over 25 C
(when mounted on a 70mm
Parameter
VO
NIN
=80dB)
=1µVrms)
BA3308
BA3308F
70mm
Q
=3.5mV)
1.6mm glass epoxy board).
Symbol
6.0V
4.5V
Topr
Tstg
V
Pd
CC
14V ( Ta=25~ 75 C )
14V ( Ta=0~ 75 C )
55 to 125
25 to 75
Limits
950
450
CC
16
=6.0V to 14V)
1
2
Unit
mW
V
C
C
BA3308 / BA3308F
1/8

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BA3308F Summary of contents

Page 1

... Dual preamplifier with ALC BA3308 / BA3308F The BA3308 and BA3308F are dual preamplifier ICs with built-in ALC circuits, and have been designed for use in stereo radio-cassette recorders and tape recorders. They come in compact 9-pin SIP (BA3308) and 14-pin MF (BA3308F) packages, and have two record / playback preamplifiers, and an ALC circuit. The preamplifiers have high gain and low distortion, and can be directly coupled to the tape head without coupling capacitors. This prevents tape head magnetization and “ ...

Page 2

... THD 0.1 0 0.6 1.2 Vrms OM V 1.0 2.0 Vrms NIN ALC ALC 0 2 BA3308 / BA3308F ch2 N. N. N.C. Conditions V 0Vrms IN V 10dBV OUT NAB34dB, V 40mVrms OUT THD 1% Conversion with R 2.2k and g NAB34dB at 1kHz R 3. 70dBV G IN reference, THD 3% V 60dBV, 30dBV ...

Page 3

... SW3A SW3B 1 120k V 30k SW1A SW6A SW1B Fig. 1 Application example circuit PCB (copper side) ch2 220 R 6 18k 3. 100 F INPUT2 and R , connect 5 6 BA3308 / BA3308F ch2 0.1 F 1.2k 2 SW4B 33k SW2B OUTPUT2 V 100 F ~ 30k INPUT1 SW6B BA3308 1pin (40 60mm) Fig.3 3/8 ...

Page 4

... The operating point of the amplifier’s ch1 and ch2 output 7 (an effective value of approximately 0.75V), the F and R , but if they are too large the S/N ratio will worsen and R values of around several k ohms the shorter the attack time. 7 BA3308 / BA3308F 9V 1000 100 F 120 470 10k 1 2 ...

Page 5

... OUTPUT Fig.5 ch1 (ch2) Comp 4. (DC AC) OUT 3 ( Fig.6 • VS, V characteristic (see Fig.19), even if the V CC ch2 (ch1) ch2 (ch1 ch2 ch2 (ch1) (ch1) Cont BA3308 BA3308 / BA3308F voltage is made larger than 5V, CC and R that are connected to the input 5/8 ...

Page 6

... To ensure correct operation of this circuit, use the values given in the application example circuit for Application board component layout (component side BA3308 (1) Recording BA3308 3 ( 120k 0.027 OUTPUT that is connected to pin Fig.8 BA3308 / BA3308F and C connected to pins 1 and 9, and the JPW BA3308 JPW JPW (2) Playback , C and 4 8 6/8 ...

Page 7

... CC Fig.13 Voltage gain vs. power supply voltage 52dB 1Vrms OUT 20 R 10k 100 10 100 1k 10k 100k FREQUENCY : f (Hz) Fig.16 Channel separation vs. frequency BA3308 / BA3308F 100 300Vrms OUT R 10K FLAT 40 NAB 100 1k 10k 100k FREQUENCY : f (Hz) Fig.11 Voltage gain vs. frequency 120 300mVrms ...

Page 8

... POWER SUPPLY VOLTAGE : V (V) CC Fig.19 Maximum output voltage vs. power supply voltage BA3308F 8.7 0 0.3 0.1 1.27 BA3308 / BA3308F 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0 100 1k LOAD RESISTANCE : R L Fig.20 Maximum output voltage vs. load resistance 0.4 0.1 0.3Min. 0.15 SOP14 V 7V ...

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