Microchip Technology

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 Microchip


  • Universal Differential Video Receiver

  • Created: Sep 03, 2014

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Description

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Summary

The system described is a low-cost, low-power, differential signal receiver with highly efficient DC-DC Converter for its supply. It has true load disconnect and shutdown that protects the components from major board damages and surges. The system is also capable of highspeed application for it has 130MHz, -3dB bandwidth with high slew rate.


The circuit is comprised of MCP1624T-I/CH low-voltage input boost regulator that provides the +3.3V and +5V supply for the components. The ADA4851-1 low cost, high speed, rail-to-rail output operational amplifier transmits analog video signal to the ADV7180 video decoder for it to be digitized. The system eliminates noises such as the common mode noise and phase noise caused by ground potential difference from an incoming video signal. It is well suited for infotainment applications and vision safety systems for automotive applications. The configuration of the ADA4851-1 is a standard four-resistor differential amplifier with a differential-to-single-ended gain of 1. The amplifier only amplifies the difference between the two inputs, while eliminating the common-mode noise between the incoming signals and allowing the reconstruction of the original signal. The ADV7180 automatically detects and converts standard analog baseband television signals compatible with worldwide NSTC, PAL, and SECAM standards into 4:2:2 component video data compatible with the 8-bit ITU-R.656 interface standards. There are three analog video input channels supporting a wide range of consumer video sources.


The circuit is well suited for analog-to-digital conversion of video signals and can be used for infotainment, video surveillance, and asset tracking. Infotainment in vehicles is supported by this circuit as it provides AC-coupled inputs to protect the input of the amplifier from a short, due to a voltage higher than the supply voltage. The circuit also converts the analog video input from video surveillance cameras to digital output.