參數(shù)資料
型號(hào)： 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)： 8/21頁
文件大?。?/td> 147K
代理商： HA12181FP
HA12181FP
Rev.2, Jun. 1997, page 8 of 21
Test Circuit
Unit R :
C : F
Det.Out
B
50
AM-SG
50
AF-SG
+
C513
1
μ
C501
1000p
IF-IN
PULSE-IN
AF-IN
+
C506
100
μ
C503
0.01
μ
R502
15k
A
+
V
CC
(8.2V)
C504
0.22
μ
R505
47k
15
14
13
12
11
10
9
R503
180k
C507
2200p
C509
0.033
μ
R504
4.7k
+
C OUT
C508
1
μ
1
2
3
4
5
6
7
8
+
16
R500
100k
C502
3.3
μ
C500
0.033
μ
R506
12k
C512
0.068
μ
C511
0.033
μ
C510
0.033
μ
Note: 1. Resistors tolerance are within ±5%.
2. Capacitors tolerance (C509 to C512) are within ±5%, other capacitor are within ±10%.
Operation Principle
ANT.
1st IFT
RF
CONV.
IF
DET
AM-IC
3
A
B
C
16
Processing
Waveform Circuit
D
9
Out
IF
Noise
Detector
HA12181FP
Figure 2 System Block Diagram of AM Radio
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