THS7368IPWR datasheet(21/45 Pages) TI2

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75 W

S-VideoY'Out

CVBS

S-Video Y’

S-Video C’

Y'/G'

SD1OUT

SD2OUT

SD3OUT

DisableSD

GND

DisableSF

SF1OUT

SF2OUT

SF3OUT

BypassSF

SD1IN

SD2IN

SD3IN

S+

SF1IN

SF2IN

SF3IN

BypassSD

THS7368

Bypass

SDLPF

Bypass

SFLPF

P' /B'

CVBS

P' /R'

75 W

S-VideoC'Out

75 W

Y'/G'Out

75 W

P' /B'Out

75 W

P' /R'Out

75 W

+2.7Vto

+5V

DisableSF

DisableSD

THS7368

www.ti.com

SBOS497 – DECEMBER 2009

TYPICAL CONFIGURATION AND VIDEO

departs from true luminance because a nonlinear

TERMINOLOGY

term, gamma, is added to the true RGB signals to

form R’G’B’ signals. These R’G’B’ signals are then

A typical application circuit using the THS7368 as a

used to mathematically create luma (Y’). Thus,

video buffer is shown in Figure 37. It shows a DAC or

luminance

(Y)

not

maintained,

providing

encoder driving the input channels of the THS7368.

difference in terminology.

One channel is a CVBS connection while two other

channels are for the S-Video Y’/C’ signals of an SD

This rationale is also used for the chroma (C’) term.

video system. These signals can be NTSC, PAL, or

Chroma is derived from the nonlinear R’G’B’ terms

SECAM signals. The other three channels are the

and, thus, it is nonlinear. Chominance (C) is derived

component

video

Y’/P’B/P’R (sometimes labeled

from linear RGB, giving the difference between

Y’U’V’ or incorrectly labeled Y’/C’B/C’R) signals. These

chroma

(C’)

and

chrominance

(C).

The

color

signals are typically 480i, 576i, 480p, 576p, 720p,

difference signals (P’B/P’R/U’/V’) are also referenced

1080i, or up to 1080p60 signals. Because the filters

in this manner to denote the nonlinear (gamma

can be bypassed, other formats such as R'G'B' video

corrected) signals.

up to QXGA or UWXGA can also be supported with

the THS7368.

Note that the Y’ term is used for the luma channels

throughout this document rather than the more

common luminance (Y) term. This usage accounts for

the definition of luminance as stipulated by the

International Commission on Illumination (CIE). Video

(1) SF indicates selectable filter.

Figure 37. Typical Six-Channel System Inputs from DC-Coupled Encoder/DAC with DC-Coupled Line

Driving

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