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參數(shù)資料
| 型號： | HA12181FP |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | AM Radio Noise Reduction System |
| 中文描述： | AM收音機(jī)降噪系統(tǒng) |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 147K |
| 代理商： | HA12181FP |
HA12181FP
Rev.2, Jun. 1997, page 5 of 21
Table of Pin Description and External Parts
(cont)
External parts
Influence of External
parts
No.
of
pin Name
Function
DC
voltage
(V) (No
input)
Equivalent circuit
No.
recom-
mended
value
Larger
than
recom-
mended
value
Smaller
than
recom-
mended
value
11
Gate
Gate
R503
180 K
Gate
Gate
pulse
genera-
tion
4.5V
0
11
R503
180k
C507
2200p
C507
2200 P
pulse
width
become
wider.
pulse
width
become
narrow.
12
Vth
Determi-
nation of
noise
detection
sensitivit
y
1.1
12
R502
22k
R502
22 K
Higher
noise
detection
sensitivity.
Lower
noise
detection
sensitivity.
13
V
CC
IF Det. IF AGC
V
CC
8.2
—
—
—
—
—
14
detector
3.3
C503
0.01
μ
14
13
C503
0.01 μ
—
—
15
AF
Time
0
R505
47 K
Longer
Miss-
AGC
constant
for AF
AGC
15
R505
47k
C504
0.22
μ
C504
0.22 μ
time to
stabilize
AGC.
operaton
in noise
detector.
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