TEA6425

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Video
Applications:	--
Mounting Type:	Through Hole
Package / Case:	20-DIP (0.300", 7.62mm)
Supplier Device Package:	20-DIP
Base Part Number:	TEA6425

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Introduction

TEA6425 is an integrated circuit placed in the linear category of video processing. It is a ‘low on-resistance’ type of analogue driver which is used for multiple applications in the video processing field. The chip provides several features and benefits that make it a favoured choice amongst software engineers while performing video processing.

Application Field

In terms of applications, TEA6425 is mainly used to drive video signals from low-cost video cameras and camcorders. It is typically used for internal signal processing for digital devices, and for digital cable transport systems. Additionally, it is widely used for video displays including the plasma display panel and LCD (Liquid Crystal Display) for personal laptop monitors. The graphical description of the application field that is, the profile of the video processors and the video format, is displayed by the Video Scaler and Format Converter respectively. These two video processors form the core of TEA6425.Additionally, TEA6425 can be used as an audio processor, particularly to modify the brightness or hue of a video signal. It is also used to modify the contrast of a video signal. Furthermore, it is used as a reference generator which is interfaced with the videoscope.

Working Principle

TEA6425 works by transmitting two-channel or three-channel image data to the main system controller. This image data comprises the basic information that the main system controller needs to process the video frame. The main system controller communicates this image data to the TEA6425, which then carries out the necessary image processing operations on the image data. The TEA6425 is equipped with a video scaler that can resize the image resolution from one display mode to another. It can also act as a video converter, allowing video frames from one format to be converted to another. The scaler also allows conversion from analogue video formats such as NTSC and PAL to digital video formats such as HDTV, DTV and VGA. The TEA6425 is also equipped with a video phase detector which is used to detect the phase changes in a video signal. The phase detector can measure the phase relationship between two channels simultaneously, and compare it against the phase of the reference signal. The phase relationship can be used to identify whether the video signal is in sync with the reference signal, or if it is out‐of‐sync.The TEA6425 is also equipped with a status monitor, which can be used to monitor the status of the video processor. The status monitor can detect any errors that may occur during the image processing, and can indicate this to the main system controller. Finally, the TEA6425 is equipped with a waveform monitor, which can be used to measure the waveforms of the reference signal, and compare it against the waveform of the video signal. This is particularly useful when analysing the video signal to identify any flaws in the video frame.

Conclusion

The TEA6425 is a powerful video processing chip that can be used for a variety of applications. Its application field includes the video processing of both digital and analogue signals for various digital devices and display panels. Its working principle includes the use of a video scaler, phase detector, status monitor, and waveform monitor to process and analyse the video signal.

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