BA3870 データシートの表示（PDF） - ROHM Semiconductor

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BA3870

BBS (bass boost system) for radio cassette players

ROHM Semiconductor 

Audio ICs

2) BBS off

When BBS is off, the signal system is as shown in

Fig. 10 due to the switches in the IC, and signal flow

is as follows.

The frequency characteristics of each block are shown

in Fig. 11, and the gains are given by the following equa-

tions:

Attenuation of ATT3: GATT3 = 20log R20

R19)R20

(dB)

Gain of Amp D’: GD’ = 20log

R21)R22

R21

(dB)

As R19 = R20 and R21 = R22, the total gain GOFF when BBS

is off is

GOFF = GATT3)GD’

GOFF = 0 (dB)

and the characteristics are flat as shown in Fig. 12

BA3870

430

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