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| HA12232FP Datasheet, PDF (5/12 Pages) Hitachi Semiconductor – Audio Signal Pre-Amp. for Car Deck | |||
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HA12232FP
Input Block Diagram and Level Diagram
Vref
0.6mVrms
(â62.2dBs)
PBIN
+
â PB-EQ
Amp.
60mVrms
(â22.2dBs)
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
Gâ
Transfer Function
T = R2 [w2 c12 (R2 + R3) (R1 + R3) + 1] / R1 [w2 c12 (R2 + R3)2 + 1]
+ j â
R2w c12 (R1 â R2) / R1 [w2 c12 (R2 + R3)2 + 1]
fc1
fc2
f
Cutoff Frequency
fc = {[âb ± (b2 â 4a)1/2] / 2a} / 2Ï
a = 2c14 (R2 + R3)2 (R3 + R1)2
b = [3 (R2 + R3) (R3 + R1) â (R2 + R3)2 â (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, â)
f=0
T0 = R2 / R1
G0 = 65.3 dB
f=â
Tâ = R2 (R3 + R1) / R1 (R2 + R3)
Gâ = 36.3 dB
Figure 3 Cutoff Frequency of PB-EQ Amp.
Rev.1.00 Jun 15, 2005 page 5 of 11
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