Intersil ISL59833 200MHz视频方案

Intersil 公司的ISL59833是带电荷泵的单电源200MHz视频驱动器,内部能从3.3V电源中产生所需的负电源. ISL59833的视频输出能直接耦合到75欧姆双端传输线.输出缓冲器的增益为6dB,-3dB带宽为200MHz.本文介绍了ISL59833的主要特性,方框图以及ISL59833视频解决方案和演示板电路图.
ISL59833:200MHz Single Supply Video Driver With Charge Pump

The ISL59833 is a revolutionary device that allows true single supply operation of video amplifiers. Designed for systems requiring output swing below ground but lacking a negative power supply, the ISL59833 generates the required negative rail internally from a +3.3V power supply. This allows for DC-accurate coupling of video onto a 75Ω double-terminated line. The buffers have an integrated 6dB, eliminating the need for external gain-setting resistors. An external reference voltage can be applied to the REF pin to shift the analog video level down by the desired amount.

ISL59833主要特性:
Triple single-supply buffer
Generates negative rail from from single +3.3V supply
No output DC blocking capacitor needed
200MHz -3dB bandwidth
50MHz 0.1dB bandwidth
Fixed gain of 2 output buffer
Amplifier enable/disable function control
Outputs are high impedance in power-down mode
Pb-free plus anneal available (RoHS compliant)

应用:
Driving video



图1.ISL59833方框图



图2.ISL59833简化电路图



图3.ISL59833视频解决方案



图4.ISL59833演示板电路图