TA2123AF 查看數據表（PDF） - Toshiba

零件编号

产品描述 (功能)

比赛名单

TA2123AF

TOSHIBA Bipolar Integrated Circuit Silicon Monolithic

Toshiba 

TA2123AF

2. Power amplifier stage

(1) Input of power amplifier

Each input signal should be applied through a capacitor. In case that DC current or DC voltage is applied

to each amplifier, the internal circuit has unbalance and the each amplifier doesn’t operate normally.

It is advised that input signal refer to VREF voltage, in order to reduce a pop noise or low frequency leak.

(2) Output application

This IC can chose the output coupling type and OCL type. The C-AMP SW should be connected to GND

in case that the output coupling type is chosen. The supply current decreases when not using the bass

boost function.

(3) Bass boost function

(a) System

This IC has the bass boost function in power amplifier stage. After this system adds the low frequency

ingredient of side amplifier, it is applied into the center amplifier. And the bass boost level is controlled

by the variable impedance circuit (Fig.3)

· Flow of the bass boost signal

Variable impedance circuit→Boost amplifier→Center amplifier

· Flow of the bass boost level

Output of center amplifier→AGC DET (level detection) →

Variable impedance circuit operation

The system of treble boost function is realized by frequency characteristic adjustment of the side

amplifier.

28

PWA

20

Flow of the bass boost signal

PWC

21

27

Ra

ATT

PWB

22

Ra

31

Rd

C4

BST

33

32

36

+

AGC

DET

35

34

Rc

-+

R1 C2

Flow of the Bass boost level

C5 Rb

Fig.3 Bass boost system

9

2002-10-30

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