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FMS6363A Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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FMS6363A Datasheet(HTML) 7 Page - Fairchild Semiconductor |
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7 / 10 page  © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6363A • Rev. 2.0.2 7 The same method can be used for biased signals. The Pb and Pr channels are baised to set the DC level to 500mV. Figure 9. Biased SCART with DC-Coupled Outputs The same circuits can be used with AC-coupled outputs if desired. DVD or STB SoC DAC Output 75Ω LCVF Clamp Active 0.1μ 0V - 1.4V 220μ Figure 10. DC-Coupled Inputs, AC-Coupled Outputs DVD or STB SoC DAC Output LCVF Clamp Active 0.1μ 0V - 1.4V 75Ω 220μ Figure 11. AC-Coupled Inputs and Outputs Figure 12. Biased SCART with AC-Coupled Outputs Note: 1. The video tilt or line time distortion is dominated by the AC-coupling capacitor. The value may need to be increased beyond 220μF to obtain satisfactory operation in some applications. Power Dissipation The FMS6363A output drive configuration must be considered when calculating overall power dissipation. Care must be taken not to exceed the maximum die junction temperature. The following example can be used to calculate the power dissipation and internal temperature rise: TJ = TA + Pd • JA (1) where: Pd = PCH1 + PCH2 + PCH3 (2) PCHx = VCC • ICH - (VO 2/R L) (3) where: VO = 2VIN + 0.280V (4) ICH = (ICC/3) + (VO/RL) (5) VIN = RMS value of input signal ICC = 22mA VCC = 3.3V RL = channel load resistance Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. The FMS6363A is specified to operate with output currents typically less than 50mA, more than sufficient for a dual (75Ω) video load. Internal amplifiers are current limited to a maximum of 100mA and should withstand brief-duration short-circuit conditions. This capability is not guaranteed. LCVF Clamp Active 0.1µ External video source must be AC coupled 0V - 220µ 75 75 LCVF Clamp Active 0.1µ External video source must be AC coupled 0V - 220µ 75 75 |
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