BA3570FS datasheet(5/10 Pages) ROHM

5 / 10 page

fCL1=

π S (R3//R4) S C4

EVR

GV(ATT) = 20log

R10

)EVR

)R11

GV(B) = 20log

fCL3 =

π S R7 S C11

(Hz)

fCL2 =

π S R12 S C12

R14

GV(D) = 20log

R13

R15+R16

GV(E) = 20log

R15

fCH1 =

π S (R6+R8) S C10

(Hz)

558

Audio ICs

BA3570F / BA3570FS

1) Bass signal transmission and gain vs. frequency

2) Treble signal transmission and gain vs.

frequency

The gain and cutoff frequency of each block is as follows:

LPF1 cutoff frequency :

(Hz)

Amp A gain

: GV(A) = 0

(dB)

ATT attenuation

(dB)

Amp B gain

(dB)

Amp B cutoff

frequency

LPF2 cutoff frequency :

(Hz)

Amp C gain

: GV(C) = 0

(dB)

Amp D gain

(dB)

Mute switch gain

: GV(MUTE) = 0

(dB)

Amp E gain

(dB)

z15dB

In this case, R3 = R4 = 2SR12 (= 100k

Ω) and C4 = C12 (=

0.1

µF), therefore fCL1 = fCL2 (= 32Hz), and the frequency

characteristic is bass boost (

*12 dB/OCT) as shown in

Fig. 4. Also, R14 = 2SR13, therefore GV(D) = 6 (dB) and the

EVR MAX total gain GLMAX when signals are input from

both channels is

GLMAX = GV(A)+GV(B)+GV(C)+GV(D)

GLMAX = +GV(MUTE)+GV(E)

GLMAX = GV(B)+6+15 (dB)

The gain and cutoff frequency of each block is as follows:

HPF cutoff

frequency 1

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