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参数资料
| 型号： | LA3450 |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PDIP28 |
| 封装： | DIP-28 |
| 文件页数： | 2/16页 |
| 文件大小： | 522K |
| 代理商： | LA3450 |
LA3450
Νο.2393-10/16
6. Separation adjust method
The separation is adjusted by varying the gain of the main signal with VR2, VR3 as shown in the Sample Application
Circuit. Sample Application Circuit (1) or (2) is used according to the attenuation of the input sub signal. When the
attenuation ratio of the sub signal to the main signal is 0.92 or greater to 1, use Sample Application Circuit (1), and
when 0.92 or less to 1, use Sample Application Circuit (2). Capacitors C20 and C21, which are used to improve the
separation characteristic at high frequencies, must be set to the optimum values according to your model set.
7. Cal-tone
The OSC frequency can be set with R2, C9 in the Sample Application Circuit (refer to Fig. 2). The OSC level can be
attenuated on connecting resistor Rx across pin 15 and pin 16 (refer to Fig. 3). When the S2 is turned on, the
triangular wave generated on pin 15 is amplified by the post amplifier and output. The level at pins 18, 20 is
approximately 4V (p-p) when the typical constants are used in the Sample Application Circuit and the output level
becomes approximately 4
×20/ (Rx+20) V (p-p) by connecting Rx.
0
1000
OSC Frequency -- R2, C9
R2 -- k
Ω
OSC
Frequenc
y
-
-Hz
JK345011
0
10
20
30
40
200
400
600
800
VCC = 13V
0.47
μF
1
μF
C9 = 0.22μF
Fig.2. OSC Frequency – R2, C9
8. VO – IO characteristic at pin 27
Fig. 4 shows VO – IO characteristic at pin 27 (IO : Capable of being drawn to the outside)
Maximum current : 3mA
50
60
Vo -- Io
Output Current, Io -- mA
Output
V
oltage,
V
o
--
V
JK345013
0
1
2
3
4
52
54
56
58
5
Io
Vo
100
μF
+
27
Fig.4
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