THS7364IPW datasheet(28/47 Pages) TI

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75 W

S-VideoY'Out

CVBS

S-Video Y’

S-Video C’

Y'/G'

SD1OUT

SD2OUT

SD3OUT

DisableSD

GND

Disable FHD

FHD1OUT

FHD2OUT

FHD3OUT

Bypass FHD

SD1IN

SD2IN

SD3IN

S+

FHD1IN

FHD2IN

FHD3IN

BypassSD

THS7364

Bypass

SDLPF

Bypass

LPF

FHD

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

Disable FHD

DisableSD

THS7364

SBOS530 – AUGUST 2010

www.ti.com

TYPICAL CONFIGURATION AND VIDEO

the definition of luminance as stipulated by the

TERMINOLOGY

International Commission on Illumination (CIE). Video

departs from true luminance because a nonlinear

A typical application circuit using the THS7364 as a

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

video buffer is shown in Figure 77. It shows a DAC or

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

encoder driving the input channels of the THS7364.

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

One channel is a CVBS connection while two other

luminance

(Y)

not

maintained,

providing

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

difference in terminology.

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

SECAM signals. The other three channels are the

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

component

video

Y’/P’B/P’R (sometimes labeled

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

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

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

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

from linear RGB, giving the difference between

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

chroma

(C’)

and

chrominance

(C).

The

color

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

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

up to QXGA or UWXGA can also be supported with

in this manner to denote the nonlinear (gamma

the THS7364.

corrected) signals.

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

(1)

Figure 77. Typical Six-Channel System Inputs from DC-Coupled Encoder/DAC with DC-Coupled Line

Driving

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