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Maxim > Design Support > Technical Documents > Application Notes > Video Circuits > APP 1024
Keywords: single, SCART, video applications, TV, Europe, PAL, integrated circuits, ICs, scart interfaces,
switching
APPLICATION NOTE 1024
A Single SCART Interface for Video
Jul 30, 2002
Abstract: In many SCART applications, specialized ICs are used for the SCART interface because of the
complicated switching required. This is not cost effective for single SCART implementations.
The circuits described in this application note are alternative methods that provide high quality SCART
interfaces without adding switches or a mux.
In Europe, the external connections to TVs, set-top boxes, VCRs and other video peripherals are
provided by a SCART, or Peritel, connector. Its pin-out is specified in EN50049. Depending on the
SCART connector's use (TV SCART, AUX SCART, or VCR SCART) the connector is an input, an
output, or both.
The addition of S-VHS complicated this interface by requiring the RED and Cvbs pins (15 and 20) to be
shared with the Chroma (C) and Luma (Y) pins.
In most cases, specialized ICs are used for the SCART interface because of the complicated switching
required. But this is not cost effective for smaller, unidirectional implementations.
The simplest form is the single SCART switch found on the TV's input and encoder's outputs. The
circuits below are an alternative method that provides a high quality interface without adding switches or
a mux.
Here, the enable function of the MAX4384 quad video op-amp is used to multiplex the R/Chroma and
Cvbs/Luma formats, and buffer them, and a MAX4451 dual video op-amp buffers the BLUE and GREEN.
Figure 1 shows this as an output SCART, Figure 2, as an input SCART, and Figure 3, as a bi-
directional SCART.
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