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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)： | 3/21頁 |
| 文件大小： | 147K |
| 代理商： | HA12181FP |
HA12181FP
Rev.2, Jun. 1997, page 3 of 21
Table of Pin Description and External Parts
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
1
IF AGC Time
2.7
R500
100 K
Longer
Longer
constant
for IF
AGC.
+
R500
100k
C502
3.3
μ
1
C502
3.3 μ
time to
stabilize
AGC.
distortion
of recover.
2
Bias1
Bypass
for
voltage
Stabi.
3.2
C500
0.033
μ
2
C500
0.033 μ
—
Increased
noise.
3
AF
input
Input of
AF.
3.3
C513
20k
3
+
AF IN
C513
1 μ
—
—
4
Bias2
Decide
the
current of
filter
network.
1.3
4
R506
12 K
Cut off
frequency
of L·P·F
and H·P·F
shifted
lower.
Cut off
frequency
of L·P·F
and H·P·F
shifted
higher.
5
Phase
Phase
circuit
3.3
C512
0.068
μ
5
C512
0.068 μ
Must be used on the
recommended value.
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