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參數(shù)資料
| 型號(hào)： | LA1137NM |
| 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(shù)： | 4/19頁 |
| 文件大小： | 720K |
| 代理商： | LA1137NM |
LA1136N, LA1137N Usage Notes
1.
Do not connect the antenna alignment circuit and local oscillation circuit.
2.
The coils should be specified to obtain an output level of –25 dBm (43.6 mVrms) for the given input levels shown below,
and under the conditions fm = 400 Hz, 30% modulation and fOSC = 1.45 MHz.
Antenna input
20.0 dB (Note)
Mixer input
30.5 dB
IF input
38.0 dB
Detector input
106.0 dB
Input connections
Note : The antenna input can be adjusted by changing the number of turns in the primary winding of the alignment coil in
accordance with the AGC figure-of-merit.
3. Coil Design Notes
(1) RF alignment coil
.
Gain adjustment: The gain is adjusted by varying the primary turns ratio of the primary coil.
.
Coupling: The design of this coil is geared towards critical coupling.
The coupling is dependent on the turns ratio of the primary coil and the secondary coil:
Tight coupling: High turns ratio
Loose coupling: Low turns ratio
.
With tight coupling, the selectivity characteristic develops a double hump; when making a tracking adjustment, it must
be noted that misadjustment can occur, leading to a deterioration of the dual signal characteristics.
.
With loose coupling, selectivity increases, but the sensitivity error within the band of the RF alignment itself also
increases.
During design, be certain to confirm data such as that for coil specifications. Furthermore, it is also necessary to note that
although the turns ratio of the primary and secondary coils have the greatest bearing on coupling, the shape of the coil core
and the manner in which the coil is wound also have an impact.
Mixer input
Antenna input
Detector input
IF input
V12 = 0 for LA1136N
Unit (resistance: Ω, capacitance: F)
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-12/28
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LA1145M | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
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| LA1140 | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA1140_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF SYSTEM FOR CAR RADIO |
| LA1140B-E | 制造商:ON Semiconductor 功能描述:CAR RADIO FM IF SYSTEM - Ammo Pack |
| LA1140-E | 功能描述:射頻接收器 CAR RADIO FM IF SYSTEM RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| LA1143 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF System for Car Radios |
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