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參數資料
| 型號： | LA1135M |
| 元件分類： | 接收器 |
| 英文描述： | AM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封裝： | MFP-20 |
| 文件頁數： | 18/20頁 |
| 文件大小： | 294K |
| 代理商： | LA1135M |
LA1135, 1135M
No.1272-7/20
ANT input
0.1
μF
1MHz
(400Hz
-30%mod)
1MHz
(400Hz-30%mod)
JIS
Antenna
Dummy
450kHz
(400Hz-30%mod)
50
Ω
50
Ω
50
Ω
50
Ω
50
Ω
IC
6
IC
9
0.1
μF
450kHz
(400Hz-30%mod)
100
Ω
0.1
μF
50
Ω
50
Ω
IC
11
Proper cares in using IC
1. Bias condition : RF VCC ≤ IF VCC
2. Avoid coupling between the antenna tuning circuit and the local oscillation.
3. Connect detection capacitor C15 across pins 13 (output) and 14 (VCC) so that no leakage of the IF signal to the GND
line occurs. (If connected to GND, the tweet and the usable sensitivity may get worse.) Radiation from C15 may cause
harmonics in the IF signal to return to the RF stage, thereby leading to more tweet interference. So, connect C15 as
close to pins 13, 14 as possible. Consider the direction of the capacitor and separate it from the ANT circuit.
4. For R9, use a semifixed resistor with VSM considered.
5. When designing the coils, consider the following conditions.
Shown below is the input level at each pin at which the detection output at fm = 400Hz 30% mod becomes -25dB.
ANT
MIX
IF
Det
16.0dB
μ
28.0dB
μ
45.0dB
μ
61.0dB
μ
How to apply input to each stage
ANT stage
MIX stage
IF stage
Det stage
6. ANT damping
To make the ANT damping constant within the receiving band, change the application circuit as shown below.
Old circuit
New circuit
Measures
Replace R1 with CD.
CD (2000pF to 3000pF or thereabouts)
Relocate L2.
Damping (600kHz to 1400kHz) Old circuit -15dB
New circuit -4dB
Double tuning
L2
L1
4
1
2
C1
C2
VCCRF
C7
+
C8
R1
R2
R3
L2
L1
2
1
4
C1
C2
VCCRF
C7
C8
C
D
R2
R3
相關PDF資料 |
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|---|---|
| LA1137NM | AM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| LA1137N | AM, AUDIO SINGLE CHIP RECEIVER, PDIP20 |
| LA1136NM | AM, AUDIO SINGLE CHIP RECEIVER, PDSO24 |
| LA1136N | AM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| LA1143 | FM, AUDIO DEMODULATOR, PDIP16 |
相關代理商/技術參數 |
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|---|---|
| LA1136 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
| LA1136M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA1136N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
| LA1136NM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
| LA1137 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
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