전자부품 데이터시트 검색엔진 |
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LA7578N 데이터시트(PDF) 9 Page - Sanyo Semicon Device |
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LA7578N 데이터시트(HTML) 9 Page - Sanyo Semicon Device |
9 / 18 page Design Materials Fig. 5 Fig. 6 De-emphasis 0.01µF Fig. 7 Pin 1 (FM detector output) Pin 1 is the audio FM output pin. A 200 Ω resistor is connected in series with the emitter follower. (1) Audio multiplexing applications Depending on the audio multiplexing decoder input application, the input impedance may be low, the L-R signals, etc., may be distorted, or the stereo characteristics may be degraded. In this type of situation, add a resistor between pin 1 and GND as shown in Fig. 6. R1 ^ 5.1 k Ω (2) Monaural applications Add a de-emphasis circuit with external CR. t=CR2 Pin 2 (FM discriminator) Pin 2 is the phase shifter pin for an FM quadrature detector. This pin generates the 90 deg phase shift signal needed for quadrature detection and adds it to the multiplier. (1) The detector band characteristics are primarily determined by the coil Q and coil damping resistance. Determine the damping characteristics in accordance with the output level and band characteristics. (2) When muting is applied, DC voltage (1 V or less) is applied to point A. LA7578N No.4037-9/18 |
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