參數(shù)資料
型號(hào)： LA1135M
元件分類： 接收器
英文描述： AM, AUDIO SINGLE CHIP RECEIVER, PDSO20
封裝： MFP-20
文件頁(yè)數(shù)： 20/20頁(yè)
文件大小： 294K
代理商： LA1135M
LA1135, 1135M
No.1272-9/20
Continued from preceding page.
Specification for coil
YT-30202 (Mitsumi)
2157-2239-649 (Sumida)
1-3
84T
7BRS-9286A (Toko)
4-6
17T
13. The variations (especially in case of small coupling coefficient) in the oscilation coil may cause a parasitic oscillation
of approximately 100MHz to occur at the local oscillation buffer output (pin 20) at low temperatures. In this case,
connect a capacitor of 30pF or greater across pin 20 and GND. (When the oscillation coil is used with no tap, no
problem arises.)
14. The recommended double-tuning circuit has a loose coupling at 2T. Therefore, the change in the total number of turns
may affect the coupling coefficient subtly, causing a tight coupling and making the selectivity characteristic
double-humped.
Especially for a receiving band of 1400kHz or more, the tracking method may affect the band characteristic of
sensitivity and the cross modulation characteristic considerably. When making a design, check to see if critical
coupling occurs or not.
15. Sensitivity difference at 600kHz or less
In the application circuit configuration shown below, the bypass capacitor in the position where the tuning voltage is
applied and coupling L for double-tuning may cause an antiresonance point of 400kHz to 600kHz depending on the
variations in the coil, varactor diode, etc. The value of the bypass must be 0.047
μF or greater. The recommended value
is 0.1
μF.
0
80
60
40
20
100
400
1400
1600
1200
800
1000
600
1800
Receiving frequency, fr – kHz
Usable
sensitivity
,Maximum
sensitivity
–
d
B
μ
Image
frequency
interference
–
d
B
Tracking
at
each point
Usable sensitivity S/N 20dB
Maximum sensitivity at -25dB
output
Wide-band
AGC
OFF
3
2
1
4
6
8V
2SC536
YT30202
2SK315
22
μ
F
0.022
μF
0.022
μF
0.1
μ
F
SVC321
× 2
YT-30018
100k
Ω
75
Ω
100k
Ω
2pin
6pin
1pin
VT
8V
2SC536
YT30202
2SK315
22
μ
F
0.022
μF
0.022
μF
0.1
μ
F
SVC321
× 2
YT-30018
100k
Ω
75
Ω
100k
Ω
pin2
pin6
pin1
VT
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