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PDF HA12181FP Data sheet ( Hoja de datos )
| Número de pieza | HA12181FP | |
| Descripción | AM Radio Noise Reduction System | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HA12181FP
AM Radio Noise Reduction System
ADE-207-171A (Z)
2nd. Edition
June 1997
Functions
• Buffer amp. for audio
• Linear approximate circuit for noise reduction
• IF Amp., detector, audio amp. and AGC circuit for noise detection
• Gate pulse generator
Features
• High noise cancelling capacity: 46 dB typ.
• Less gain loss: GV = –0.5 dB typ.
• Low total harmonic destortion and high signal-to noise ratio: THD = 0.06% typ., S/N = 75 dB typ.
• Operation supply voltage range: 7.0 V to 10 V (8.2 V typ.)
• Less external parts count
1 page  
HA12181FP
Table of Pin Description and External Parts (cont)
No.
of
pin Name
DC
voltage
(V) (No
Function input)
Equivalent circuit
11 Gate Gate
pulse
genera-
tion
4.5V
0
11
12 Vth
Determi- 1.1
nation of
noise
detection
sensitivit
y
13 VCC
VCC
8.2
14 IF Det. IF AGC 3.3
detector
C507
2200p
R503
180k
12
R502
22k
—
External parts
Influence of External
parts
Larger Smaller
than
than
recom- recom- recom-
mended mended mended
No. value value value
R503 180 K Gate
Gate
C507
2200 P
pulse
width
become
wider.
pulse
width
become
narrow.
R502 22 K
Higher Lower
noise
noise
detection detection
sensitivity. sensitivity.
—
C503
——
0.01 µ —
—
—
15 AF
AGC
Time 0
constant
for AF
AGC
14 13
C503
0.01µ
15
C504
0.22µ
R505
47k
R505
C504
47 K
0.22 µ
Longer
time to
stabilize
AGC.
Miss-
operaton
in noise
detector.
Rev.2, Jun. 1997, page 5 of 21
5 Page 
Evaluation Circuit for Noise Reduction Effect
HA12181FP
Rev.2, Jun. 1997, page 11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet HA12181FP.PDF ] | |
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