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BA3308FV-E2 Datasheet(PDF) 5 Page - Rohm

No. de pieza BA3308FV-E2
Descripción Electrónicos  Preamps with Built-in ALC
Download  13 Pages
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BA3308FV-E2 Datasheet(HTML) 5 Page - Rohm

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Technical Note
5/9
BA3308F,BA3308FV
www.rohm.com
2012.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Description of operations
1.
Recording
1)
Record amplifier
2)
ALC
Fig.5
BA3308
Cont
ch2
(ch1)
ch2
(ch1)
ch1
(ch2)
2 (8)
1 (9)
3 (7)
5
3.9k
10
F
INPUT
39
18k
1M
100
F
10
F
22
F
OUTPUT
R1
(R2)
R3
(R4)
R5
(R6)
R7
(R8)
C1
(C2)
C3
(C4)
C5
(C6)
C7
(C8)
Fig.14
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
operation starts. The electronic volume, which is connected between
the input line (13, 9pin) and GND, causes the input signal to
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 k
Ω of 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.
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.
13(9)
11(10)
1 (7)
4
Fig.6
ch2
(ch1)
ch2
(ch1)
ch1
(ch2)
Cont
Comp
BA3308
3 (7)
5
2 (8)
4.5VF
VOUT (DC
AC)
3VF
R7
C7
R1
(R2)
Fig.15
1 (7)
4
13(9)


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