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參數(shù)資料
| 型號： | HA12179F |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp) |
| 中文描述： | 音頻信號加工者為汽車甲板和卡座（杜比B型鉛放大器星期日） |
| 文件頁數(shù)： | 12/40頁 |
| 文件大小： | 259K |
| 代理商： | HA12179F |
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HA12179F
Rev.1, Apr. 1994, page 12 of 40
Input Block Diagram and Level Diagram
R34
5.1k
R35
5.1k
R36
12k
R38
330k
R39
180
C25
0.01
μ
R37
18k
EQ OUT-M
EQ AMP.
NFI
RIN
VREF
FIN
0.6mVrms
(
–
62.2dBs)
EQ OUT
TAI
30mVrms
(
–
28.2dBs)
–
+
+
–
INPUT AMP
C24
0.1
μ
HA12179F : 387.5mVrms (
–
6.0dBs)
PBOUT
RECOUT
300mVrms
(
–
8.2dBs)
NR circuit
Note:
The each level shown above is typical value when offering PBOUT level to PBOUT pin. (EQ AMP.)
Gv = 40 dB, f = 1 kHz
Figure 3 Input Block Diagram
Adjustment of Playback Dolby Level
After replace R34 and R35 with a half-fix volume of 10 k
, adjust RECOUT level to be Dolby level with
playback mode.
Note on Connecting with Tape Head to IC
This IC has no internal resistor to give the DC bias current to equalizer amp., therefore the DC bias current
will give through the head. This IC provides the Vref buffer output pin for Rch and Lch separately (has
two Vref terminal). In case of use that the Rch and Lch reference of head are connected commonly, please
use one of Vref terminals of IC (47 pin or 52 pin) for head reference.
If both 47 pin and 52 pin of IC are connected, rush current give the great damage to IC. The application
circuit is shown in figure 4.
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