TA2123AF 데이터 시트보기 (PDF) - Toshiba

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TA2123AF

TOSHIBA Bipolar Integrated Circuit Silicon Monolithic

Toshiba 

TA2123AF

(4) Treble boost

The EQ terminal is synchronizes with the BST SW, and the input impedance is changed.

BST OFF: 100kΩ (typ.)

BST ON: 1.9kΩ (typ.)

The voltage gain increase 6 dB (typ.) at high frequency range in case that the capacitor CX is connected

between the EQ terminal and the PW NF terminal.

PW IN 28

PW NF 29

+ PWA / B

−

EQ30

Fig.6 Treble boost

(5) Cross talk of output coupling type

In case of output coupling mode, the cross talk is determined by resistor RL and capacitor C which are

connected with power amplifier output as shown in Fig.7.

The formula is shown below.

G (ω) = 1 / 2 [1 + jωC (RL / 2)]

CT = 20ℓog|Gv| = 20ℓog [1 / 2 [ 1+ (w / w0 )2 ]], ω0 = 1 / C (RL / 2)

At f = 1kHz, C1 = 220µF, RL = 32Ω, The cross talk becomes about 33 dB.

PWA

R2

PWC

PWB

RL

+

RL

VREF

~

+

Fig.7 Cross talk of output coupling type

12

2002-10-30

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