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參數(shù)資料
| 型號： | LA3430 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PZIP16 |
| 封裝： | 3 MM PITCH, SIP-16 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | LA3430 |
LA3430
No. 1408-9/13
(7) VCO damping
VCO oscillations can be damped by applying a voltage not less than 7V to the HCC terminal (pin 7) to induce a
monaural mode. At this time, both SNC and HCC are in an off mode. Fig. 9 shows flow-in current by voltages
applied to pin 7.
(8) Forced monaural
By disconnecting LED lamp at pin 10 from VCC lamp, reception mode forced monaural function can be attained.
(Stereo lamp is turned OFF. Pilot cancel and HCC function are held.)
10
Sample weak radio field S/N improvements
by the system (Fig. 1)
S/N
-
-dB
Signal
Meter
Output
V
oltage
-
V
80
70
60
50
40
30
20
10
0
1
2
3
High-Cut
Rate
-
-%
4
5
6
Antenna Input -- dB
μ
JK343015
20
0
204060
Δf = 22.5kHz
Monaural
S/N
HCC
SNC
(Sep)
Stereo
S/N
S/N improve-
ments by
HCC and SNC
IF-stage
signal
meter
output
1.6
0
20
40
60
80
100
120
140
SNC Characteristic (Fig. 3a)
Pin 8 Voltage, V8 -- V
Sub-signal
Demodulation
Le
v
el
-
-%
JK343017
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Sub-signal level
VCC = 10V
2.0
SNC Characteristic (Fig. 3b)
Pin 8 Voltage, V8 -- V
Separation,
Sep
-
-dB
JK343018
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
10
20
30
40
50
60
70
Separation
VCC = 10V
JK343016
Separation,
Sep
-
-dB
Antenna Input -- dB
μ
S/N
-
-dB
10
SNC and HCC Operating Regions (Fig. 2)
Signal
Meter
Output
V
o
ltage
-
V
80
70
60
50
40
30
20
10
0
1
2
3
4
5
6
20
0
204060
Δf = 22.5kHz
Monaural
S/N
Stereo
S/N
Signal meter
output
voltage
SNC
region
IF muting
region
HCC region
21.7dB
C
B
A
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