TLS1255 Datasheet, PDF (1/7 Pages) Texas Instruments – VIDEO PREAMPLIFIER SYSTEM WITH ON-SCREEN DISPLAY (OSD)MIXER

TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ONĆSCREEN DISPLAY (OSD) MIXER
SLVS142 − DECEMBER 1996
D Wide Bandwidth . . . Typ 100 MHz at −3 dB
D Color Saturation Control Features
N PACKAGE
(TOP VIEW)
D Digital Level Control (0 V to 4 V) for
Contrast, Color, and Brightness
D Mixer Function for OSD Applications
R_OSD_IN ₁
G_OSD_IN ₂
B_OSD_IN ₃
28 ^OSD_ADJUST
27 ^{R_GAIN_ADJUST}
26 ^R_CLAMP(+)
D Blanking Function for On-Screen Display
(OSD) Applications
D Fewer Peripheral Components Required
D Low-Impedance Output Driver
R_VIDEO_IN 4
R_CLAMP_CAP 5
G_VIDEO_IN 6
GND 7
G_CLAMP_CAP 8
25 R_VIDEO_OUT
24 G_GAIN_ADJUST
23 V_CC2
22 G_VIDEO_OUT
21 G_CLAMP(+)
description
B_VIDEO_IN 9
B_CLAMP_CAP 10
20 B_VIDEO_OUT
19 B_GAIN_ADJUST
The TLS1255 is a wide-band video preamplifier
system intended for high-resolution red-green-blue
(RGB) color monitors with color-saturation control
features. The saturation of a color refers to the
V_CC1 11
CONTRAST 12
COLOR 13
CLAMP_GATE 14
18 GND
17 BLANKING
16 OSD_BLANKING
15 B_CLAMP(+)
degree of chroma or purity, or the degree of
freedom from admixture with white. In addition to
the RGB preamplifier function, the TLS1255 provides color-saturation control and gain control at the video
system outputs. Each video amplifier (R, G, and B) contains a gain set for adjusting maximum system gain
(A_V = 6 dB). The TLS1255 provides a digital level-operated contrast, brightness, color, and gain adjustment. The
video-output stages from TLS1255 directly drive CRT power amplifiers.
The system has been designed to operate from a 12-V supply with all digital level controls operating over a
0-V to 4-V range to make the interface to serial digital buses possible. The TLS1255 also contains a blanking
circuit that clamps the video output voltage to within 0.2 V of ground. The mixer circuit required for the OSD
application is also integrated into the TLS1255, which makes the design of video boards and other applications
easier.
The TLS1255 is characterized for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1996, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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