Technical Note

6/9

BA3308F,BA3308FV

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2010.04 - Rev.A

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

2.

On playback

.

Since 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:

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.

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

since ALC is not needed.

For better signal-to-noise ratio

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

Fig.7

A1

BA3308

2 (8)

10μF

0.027μF

39



1 (9)

3 (7)

5

INPUT

OUTPUT

10μF

100μF

4.3k



120k



13(9)

11(10)

1 (7)

4

Fig.16