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TA0310 View Datasheet(PDF) - STMicroelectronics

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TA0310
Analog video formats
capacitance on the order of pF. In this situation, the driver must maintain high stability even under
capacitive loads. Set-top boxes can also feature an analog video input featuring the same constraints.
The choice of the video source is done via the set-top box. The source signal can be delivered from a
DVD or a video camera, for example.
Figure 1: Location of op-amps in video applications
Cable
Satellite
75line
Set-Top-Box
output
150Load
input
Capa Load
75line
DVD output
150Load 75line
Terrestrial
Cable
Satellite
TV
input
Capa Load
SCART PLUGs
input
Capa Load
output
150Load
CAMERA
75line
The amplifier can be very specific, including features such as buffer+filtering (ex: STv6433) or video
matrix (STv6412), or, linked to the market trend, it can be embedded in the chipset.
On the other hand, the amplifier stage can also be a discrete solution using transistors or high-speed op-
amps. Where the customer’s goals are speed and space-saving, high-speed op-amps provide an
advantage as compared to a transistor solution. For this reason, there is currently a market for the high-
speed op-amps in broadcast video applications.
4 Analog video formats
The format of the analog video signal is very important in order to evaluate the frequency and amplitude
contraints required of the high-speed op-amp. There are three main division of signal formats, each
giving a different quality of television image.
The first type of signal format is comprised of three separate signals based on the R,G and B signals. This
signal form is the "purest" video signal, providing the highest quality image. The three R, B and G signals
feature the same bandwidth. This bandwidth is directly linked to the video resolution. In standard video
broadcast, we use commonly YIQ, YUV or YPbPr, where appears the Luma (Y), (I,U,Pb) and (Q,V,Pr) are
a component of R, B and Y. In of all these formats, three signals are driven.
The second type of signal format is based on two signals, such as Luma-Chroma (Y/C) or S-Video, where
C is the Chroma. Both are a coding of RGB signals linked to the NTSC, PAL and SECAM video standards
developed in the USA, Europe and Asia.
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