전자부품 데이터시트 검색엔진 |
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LA1135 데이터시트(PDF) 8 Page - Sanyo Semicon Device |
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LA1135 데이터시트(HTML) 8 Page - Sanyo Semicon Device |
8 / 18 page Continued from preceding page. Unit (resistance: Ω, capacitance: F) Specification for coil YT-30202(Mitsumi) 1-3 84T 4-6 17T 13. The variations (especially in case of small coupling coefficient) in the oscilation coil may cause a parasitic oscillation of approximately 100 MHz to occur at the local oscillation buffer output (pin 20) at low temperatures. In this case, connect a capacitor of 30 pF 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 1400 kHz 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 600 kHz 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 400 kHz to 600 kHz 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. Wide-band AGC OFF Tracking at each point Usable sensitivity S/N 20 dB Maximum sensitivity at –25 dB output Receiving frequency, fr – kHz 2157-2239-649 (Sumida) 7BRS-9286A (Toko) Unit (resistance: Ω, capacitance: F) LA1135, 1135M No. 1272-8/18 |
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