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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)： | 11/40頁 |
| 文件大?。?/td> | 259K |
| 代理商： | HA12179F |
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HA12179F
Rev.1, Apr. 1994, page 11 of 40
Operating Mode Control
HA12179F provides electronic switching circuits. And each operating mode control are controlled by
parallel data (DC voltage).
Table 2
Threshold Voltage
(V
TH
)
Pin No.
Lo
Hi
Unit
Test condition
14 15 16 17 18
19
–0.2 to 1.0
3.5 to 5.3
V
Input Pin
Measure
V
Table 3
Switching Truth Table
Pin No.
Lo
Hi
14
NR-OFF
NR-ON
15
PB
REC
16
MUTE-OFF
MUTE-ON
17
120 μ (NORMAL)
70 μ (METAL or CHROME)
18
FORWARD
REVERSE
19
Notes: 1. Each pins are on pulled down with 100 k
internal resistor.
Therefore, it will be low-level when each pins are open.
2. Over shoot level and under shoot level of input signal must be the standardized (High: 5.3 V,
Low: –0.2 V)
3. Reducing pop noise is so much better for 10 k
to 22 k
resistor and 1 μF to 22 μF capacitor
shown Fig 2. But the resistor connected to MUTE terminal (pin 16) should be under 10 k
.
SER (FF or REV)
REP (NORMAL SPEED)
INPUT Pin
10 to 22k
MPU
1 to 22
μ
F
+
Figure 2 Interface for Reduction of Pop Noise
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