Low-cost video multiplexer with ADA4853-2, schematic, bill of materials, assembly drawing, data sheet

Single chip microcomputer STM32L151CCU6

1206RGB (single)

L06ESDL5V0H4-2

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Summary:

Circuit function and advantage

This circuit implements a low cost, low power video multiplexer using the dual channel high speed amplifier ADA4853-2. The user can use this circuit to input a fourth video source to a three-channel video decoder, such as the ADV7180 in a 40-lead LFCSP package. This saves cost and valuable board space by using a smaller, low-cost decoder, and can be redesigned if a similar design requires only three video sources.

Conventional CMOS multiplexers and switches have several drawbacks when used under video frequency conditions. Their on-resistance introduces distortion, reduces differential gain and phase performance, and interacts with termination resistors to make incoming The video signal is attenuated and affects the brightness. System designers typically address these issues by adding external buffering to increase gain and drive capability.

Low-cost video multiplexer circuit diagram using ADA4853-2