LA7955(1999) Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
componentes Descripción
Fabricante
LA7955 Datasheet PDF : 6 Pages
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Sample Application Circuit
LA7955
Circuit and Operational Description
1. Video Input circuit
The video input circuit shown in the figure on the right has an input impedance of
approximately 20 kΩ. The input bias voltage is determined by the bias at point
(A), however, the voltage at this point fluctuates according to VCC.
2. Audio input circuit
The audio input circuit is shown in the figure on the right. The impedance of audio
inputs 1 and 2 (Pins 12, 13,18, and 19) is approximately 65 kΩ, and that of audio
input 3 (Pins 14 and 17), approximately 71 kΩ. Although the input bias voltage is
determined by the bias at point (B), the voltage at point (B) is supplied from a low-
noise Zener diode voltage regulator circuit and is not dependent on VCC.
3. Control signal input circuit
The circuit at input pins for the switching and muting circuits are shown in the
figure on the right. The threshold voltage is approximately 1.4 V.
No. 2740-4/6
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