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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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BA7746S Fiches technique(PDF) 11 Page - Rohm |
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BA7746S Fiches technique(HTML) 11 Page - Rohm |
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11 / 12 page  11 Video ICs BA7746S / BA7746FS •Operation notes (1) preamplifier The preamplifier in this IC is a high-gain amplifier for FM audio. This amplifier has been carefully designed for stability. However, the design of the PCB greatly effects the stability of the preamplifier. A list of general precautions are given below. Take note when design- ing the PCB. 1)The oscillation margin is reduced when the input and output patterns are physically close. The input and output wiring should not come out of the same side of tha IC. Good example Bad example 2)The GND pattern should be connected at one point to the main IC GND (pin 16). In addition, the pream- plifier input-side GND and output-side GND should be as close as possible to the main IC GND. Good example Bad example 3)A large GND pattern under the IC has a shielding effect, and reduced the chance of picking up exter- nal noise. 4)When the preamplifier is connected to a capacitive load such as shilded wire, or when the output cur- rent is large, the output may oscillate. In this case, connect a resistor to the preamplifier output (approx. 390 Ω). IC Input Output PRE GND MAIN IC RL GND GND Output Output Input 390 REC PRE HEAD AMP 660mVP-P BA7746S / FS 270mVP-P BH780XK series REC LPF REC LPF MOD MOD FM BPF DE MOD Connection example for BA7746S / BA7746FS and BH780XK series. Hi-Fi AUDIO IC Output Input PRE GND MAIN IC RL GND GND Output Output Input |
Numéro de pièce similaire - BA7746S |
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Description similaire - BA7746S |
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