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LA1267 Datasheet(PDF) 5 Page - Sanyo Semicon Device |
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LA1267 Datasheet(HTML) 5 Page - Sanyo Semicon Device |
5 / 14 page LA1267 No.2012-5/14 – Parameter Frequency – Admittance Unit IF γi1 10.7MHz ri 330 Ω ci 20 pF FM – Parameter Frequency – RF γi21 1MHz ri ro ci Admittance Unit k Ω pF AGC-off (V16=1.4V) AGC-on (V16=2.5V) 15 16 4 4 MIX γo19 500kHz co k Ω pF – – 3 3 ri IF γi17 500kHz co k Ω pF 2 2 10 8 AM 6. If the coupling coefficient of the local OSC coil is small and an antiresonance point of approximately 100MHz is present or the stray capacitance across pins 24 and 23 is large, a parasitic oscillation of approximately 100MHz may occur in the buffer output (pin 24). In this case, connect a capacitance of approximately 30pF across pin 24 and GND. 7. AM OSC coil Generally speaking, the following should be noted. Avoid winding with loose coupling between primary side and secondary side (especially SW1, SW2). To put it concretely, the pot core type is better than the screw core type which is loose in coupling. This prevents the local OSC frequency from turning third resonance frequency related to the coupling coefficient. 8. Resistance across pin 8 and VDD. If pin 8 is used for the stop signal (SD) only, without using LED, it is recommended to fix resistance RL across pin 8 and GND to be 51k Ω to 100kΩ. 9. To prevent whistle from worsening, make the pattern of AM output pin 14 as short as possible. Input/Output Admittance Test Circuit : FM, AM-MW T1 : 4147-1457-177 (Sumida) T2 : HW-40174 (Mitsumi) T3 : HW-40130, 40131 (Mitsumi) Unit (resistance : Ω, capacitance : F) |
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