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CLC3801ISO8X Datasheet(PDF) 7 Page - Cadeka Microcircuits LLC. |
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CLC3801ISO8X Datasheet(HTML) 7 Page - Cadeka Microcircuits LLC. |
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7 / 11 page  Data Sheet ©2007-2008 CADEKA Microcircuits LLC www.cadeka.com 7 Figure 3. Typical Output Configuration Power Supply Decoupling For optimum performance, power supply decoupling is re- quired. Figure 4 shows the recommended usage of power supply decoupling capacitors. The 0.1µF decoupling ca- pacitor must be placed as close to pin 4 as possible, < 0.1” or < 2.5mm, to be effective. The larger, 1µF capaci- tor can be placed further away. Figure 4. Recommended Power Supply Decoupling Power Dissipation TBD 0 0.5 1 1.5 2 2.5 -40 -20 0 20 40 60 80 Ambient Temperature (°C) SOIC-8 Figure 5. Maximum Power Derating Power Dissipation Considerations with DC-Coupled Loads When driving DC loads, the supply current is much higher than in AC applications and care must be taken to dis- sipate the extra heat generated. The output signal will swing from about 0.3V to 2.3V for full swing video. In the worst case condition, an all white screen with dual DC loads, the additional thermal rise over the quiescent con- dition is about 20°C. An easy way to help distribute this extra heat is to place a ground plane under the part and add ground plane on the bottom of the board immediately under the part with vias between the two planes. The CLC3800 is designed primarily for low voltage opera- tion with supply values between 3.0V and 5.5V, but larger supplies can be used. In this situation, DC loads may not be possible due to thermal considerations. With single DC loads on all three channels and a 12V supply, the thermal rise is an additional 45° this gives a total temperature rise of about 57°. 220µF 220µF CLC3800 IN1 OUT1 IN2 IN3 OUT3 +Vs OUT2 GND 75Ω 75Ω 75Ω 75Ω 220µF 75Ω 75Ω Video Cables AC-Coupling Caps are Optional 8 7 6 5 1 2 3 4 75Ω CLC3800 IN1 OUT1 IN2 IN3 OUT3 +Vs OUT2 GND +3V or +5V 0.1µF 1.0µF 8 7 6 5 1 2 3 4 |
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