HA12203 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12203

Audio Signal Processor for Cassette Deck (Dolby B-type NR with Recording System)

Hitachi -> Renesas Electronics 

HA12203NT/HA12204NT

Low-Boost

VEE

C23

0.1µ

–10%

36

DET (R)

HA12203NT

BIAS1 DET (L)

5

R3

33k

–2%

7

C5

0.1µ

–10%

VEE

Figure 7 Tolerance of External Components

EQIN

C1 R1

2.2µ 20k

Vin

R2

R3

6.8k 5.1k

+ C2

0.47µ

GND

REC EQ

EQOUT

Figure 8 Example of Low Boost Circuit

External components shown Figure 8 gives Frequency response to take 6dB boost. And cut off Frequency

can request it, by lower formulas.

Gv

f1

f2

f1 =

1

[Hz]

2π • C2 • (R1 + R0)

f2 =

1

[Hz]

2π • C2 • R2

R0 = R1 • R2 [Ω]

R1 + R2

f

Figure 9 Frequency Characteristic of Low-Boost

Rev.3, Jun. 1999, page 14 of 97

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