BA3308FV 查看數據表（PDF） - ROHM Semiconductor

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BA3308FV

Preamps with Built-in ALC

ROHM Semiconductor 

BA3308F,BA3308FV

Technical Note

2. On playback

S. ince amplifier ch1 and ch2 are used as a NAB equalizer

amplifier at playback, a time constant circuit is established in

the NF section (1-11pin, 7-10pin) to obtain NAB

characteristics. The voltage gain at this time is determined by

the following formula:

GV = │R11＋R9/ (│＋jωC9・R9)│/R3

Obtain the necessary gain by regulating the (power-on pop

noise prevention) NAB time constant circuit in the same way

when regulating the gain at recording stage. The operating

point of the output stage (1,7pin) is fixed at 3VF.

Accordingly, even if VCC is raised to 5V or more, as in the

VMAX-VCC characteristic (Fig.13), the maximum output voltage

does not rise above 1.2V (Typ.). 4pin is grounded at playback

since ALC is not needed. For better signal-to-noise ratio

characteristics at playback, don’t use R1 and R2, which are

attached to the input pin (13pin, 9pin).

BA3308

A1

123((98))

C1

(C2)

10μF

111(1(09))

R3

(R4)

39

R11

(R12)

4.3k

C3

(C4)

100μF

R9

(R10)

120k

31 ((77))

C9 0.027μF

(C10)

45

C5

(C6)

10μF

INPUT

Fig.16

Fig.7

OUTPUT

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.04 - Rev.A

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