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TA0310 View Datasheet(PDF) - STMicroelectronics

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TA0310 Datasheet PDF : 14 Pages
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TA0310
TECHNICAL ARTICLE
High Speed Operational Amplifiers
for 75Video Lines
Christophe Prugne
Technical Marketing, Standard Linear Division
1 Introduction
This paper examines the video applications in which high-speed op-amps can be found.
An overview of the main consumer video applications is presented, along with a review of analog video
formats and bandwidth versus resolution.
Finally, we present ST’s current high-speed op-amp portfolio and give technical support for the
implementation of these products in application.
2 Video applications
Currently, there are two types of video applications: broadcast video and graphics video. Broadcast video
is limited to television signal transmissions with specified bandwidth (Television, Set-Top-Box, DVD
player-recorder, Video Camera, etc.). On the other hand, graphics video meets the needs of computers
without bandwidth limitations. This article is mainly concerned with broadcast video applications.
3 Where do we need high-speed op-amps?
An amplifier stage is needed to drive analog video signals to the television via a 75video line. The
applications concerned are mostly consumer applications such as set top boxes, DVD player-recorders
and video cameras. In these applications, the output capabilities of the amplifier (output current and
distortion versus load) are very important, as it must drive a video line characterized by low impedance
(75for video lines).
Televisions also require high-speed op-amps. In TVs; the amplifier ensures good impedance matching
between the video line and the input stage in the TV. The amplifier drives the video signal to the input
stage of a chipset, which features high impedance (on the order of several k) in parallel with a
TA0310/0504
Revision 2
1/14
 

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