HA12203NT Datasheet, PDF (14/97 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12203NT/HA12204NT
Low-Boost
V_EE
C23
0.1µ
–10%
36
DET (R)
HA12203NT
BIAS1 DET (L)
5
R3
33k
–2%
7
C5
0.1µ
–10%
V_EE
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