BA3570F Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BA3570F

ALS headphone driver

ROHM Semiconductor 

Audio ICs

HPF cutoff : fCH2 =

R8+R9

frequency 2

2π S (R6R8+R8R10+R6R10) S C10

(Hz)

Amp D gain : GV(D) = 20log

R13

R13+R14

(dB)

Furthermore, as R14 = 2R13,

GV(D) = +9.5 (dB)

The total gain GH1 for the frequency band ftfCH1 is

R9

GH1 = 20log

+9.5+15

R8+R9

(dB)

and the total gain GH2 for the frequency band fCH2tf is

R9

GH2 = 20log

+9.5+15

R6 / / R8+R9

(dB)

3) Combined frequency characteristics

As shown in Fig. 6, the ALS characteristics can be ob-

tained from the bass characteristics (Fig. 4) and the

treble characteristics (Fig. 6).

BA3570F / BA3570FS

R19+R20

Amp D’ gain: GV(D) = 20log

R19

(dB)

As R17 = R18 and R19 = R20, the total gain GV(OFF) when ALS

is off is

GV (OFF) = GV (ATT2) +GV (D) +GV (MUTE) +GV (E) = 15

*6

)6

0

15

and it is flat as shown in Fig. 8.

(dB)

(2) ALS OFF

The signal circuit when ALS is off is shown in Fig. 7.

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

R18

ATT2 attenuation: GV(ATT2) = 20log

R17+R18

(dB)

559

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