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| HA12226F Datasheet, PDF (11/84 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) | |||
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HA12226F/HA12227F
Input Block Diagram and Level Diagram
The each level shown above is typical value MS
when offering PBOUT level to PBOUT pin.
REF
300mVrms PASS
PBOUT
REC
580mVrms
PB PASS/REC,
PB=5.7dB/5.7dB
FLAT
PB/REC,
AIN
(120µ)
300mVrms
21.3dB
0dB
PASS=0dB/21.4dB 300mVrms
PB
Dolby *1
RECOUT
BIN
25.9mVrms
R3 70µs
12k
REC
PASS
B-NR
300mVrms
300mVrms
R4
15k
ALC
25.5mVrms
C2
4700pF
C1
0.1µF
R1
15k
RIN
200mVrms
R2 C3
2.2k 0.1µF
Note: 1. The HA12227F is not built-in Dolby B-NR.
Figure 2 Input Block Diagram
PB Equalizer
By switching logical input level of pin 17 (for Ain) and pin 19 (for Bin), you can equalize corresponding to tape
position at play back mode.
GV
t1
t2
t1 = C2 â
(12k + 15k)
t2 = C2 â
15k
f
Figure 3 Frequency Characteristic of PB Equalizer
Rev.6.00 Jun 15, 2005 page 11 of 83
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