HA12232FP データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12232FP

Audio Signal Pre-Amp. for Car Deck

Hitachi -> Renesas Electronics 

Input Block Diagram and Level Diagram

HA12232FP

Vref

0.6mVrms

(−62.2dBs)

PBIN

+

− PB-EQ

Amp.

60mVrms

(−22.2dBs)

EQOUT

NFI

R2

330k

R1 C1

R3

180 0.01µ 12k

PB-EQ Amp. Gv = 40 dB, f = 1 kHz

Figure 2 Input Block Diagram

Cutoff Frequency, Gain of PB-EQ Amp.

G0

GV

G∞

Transfer Function

T = R2 [w2 c12 (R2 + R3) (R1 + R3) + 1] / R1 [w2 c12 (R2 + R3)2 + 1]

+ j ⋅ R2w c12 (R1 − R2) / R1 [w2 c12 (R2 + R3)2 + 1]

fc1

fc2

f

Cutoff Frequency

fc = {[−b ± (b2 − 4a)1/2] / 2a} / 2π

a = 2c14 (R2 + R3)2 (R3 + R1)2

b = [3 (R2 + R3) (R3 + R1) − (R2 + R3)2 − (R3 + R1)2] c12

Changing the value of each element to one shown in figure 2,

will be as follows.

fc1 = 50 Hz, fc2 = 1300 Hz

PB-EQ Amp. Gain (f = 0, ∞)

f=0

T0 = R2 / R1

G0 = 65.3 dB

f=∞

T∞ = R2 (R3 + R1) / R1 (R2 + R3)

G∞ = 36.3 dB

Figure 3 Cutoff Frequency of PB-EQ Amp.

Rev.1, Sep. 2000, page 7 of 14

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