TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ON-SCREEN DISPLAY (OSD) MIXER
SLVS142 DECEMBER 1996
1
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
D
Wide Bandwidth . . . Typ 100 MHz at 3 dB
D
Color Saturation Control Features
D
Digital Level Control (0 V to 4 V) for
Contrast, Color, and Brightness
D
Mixer Function for OSD Applications
D
Blanking Function for On-Screen Display
(OSD) Applications
D
Fewer Peripheral Components Required
D
Low-Impedance Output Driver
description
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
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
R_OSD_IN
G_OSD_IN
B_OSD_IN
R_VIDEO_IN
R_CLAMP_CAP
G_VIDEO_IN
GND
G_CLAMP_CAP
B_VIDEO_IN
B_CLAMP_CAP
V
CC1
CONTRAST
COLOR
CLAMP_GATE
OSD_ADJUST
R_GAIN_ADJUST
R_CLAMP(+)
R_VIDEO_OUT
G_GAIN_ADJUST
V
CC2
G_VIDEO_OUT
G_CLAMP(+)
B_VIDEO_OUT
B_GAIN_ADJUST
GND
BLANKING
OSD_BLANKING
B_CLAMP(+)
N PACKAGE
(TOP VIEW)
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
TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ON-SCREEN DISPLAY (OSD) MIXER
SLVS142 DECEMBER 1996
2
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
TLS1255Y chip information
This chip, when properly assembled, displays characteristics similar to the TLS1255. Thermal compression or
ultrasonic bonding may be used on the doped-aluminum bonding pads. The chips may be mounted with
conductive epoxy or a gold silicon preform.
BONDING PAD ASSIGNMENTS
CHIP THICKNESS: 15 TYPICAL
BONDING PADS: 4
×
4 MINIMUM
TJ max = 150
°
C
TOLERANCES ARE
±
10%.
ALL DIMENSIONS ARE IN MILS.
NO BACKSIDE METALIZATION
95
95
3
2
1
28
27
26
25
24
23
22
21
20
19
18
18
17
16
15
14
13
12
11
10
9
8
7
7
6
5
4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
(see Note 1)
13.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video output current, I
O
(per channel)
28 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total power dissipation at (or below) 25
°
C free-air temperature (see Note 2)
2.37 W
. . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature range, T
J
150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
0
°
C to 70
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. All VCC terminals must be externally wired together to prevent internal damage during VCC power-on/-off cycles.
2. For operation above 25
°
C free-air temperature, derate linearly to 1.52 W at the rate of 19 mW/
°
C.
TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ON-SCREEN DISPLAY (OSD) MIXER
SLVS142 DECEMBER 1996
3
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC1 and VCC2
11
12
13
V
High-level input voltage range, CLAMP GATE, VIH
Clamp comparators off
2.4
5
V
Low-level input voltage range, CLAMP GATE, VIL
Clamp comparators on
0
0.8
V
High-level input voltage range, BLANKING, VIH
Blanking circuit inactive
2.4
5
V
Low-level input voltage range, BLANKING, VIL
Blanking circuit active
0
0.8
V
High-level input voltage range, OSD BLANKING, VIH
OSD Blanking circuit inactive
2.4
5
V
Low-level input voltage range, OSD BLANKING, VIL
OSD Blanking circuit active
0
0.8
V
Operating free-air temperature, TA
0
70
°
C
electrical characteristics at 25
°
C free-air temperature range, CLAMP GATE = COLOR = 0 V;
R,G,B CLAMP(+) = 2 V; BLANKING = OSD BLANKING = 4 V; CONTRAST = R, G, B GAIN
ADJUST = 4 V; V
CC1
= V
CC2
= 12 V (unless otherwise noted)
PARAMETER
ALTERNATE
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ICC
Supply current
VCC1 + VCC2
110
130
mA
Vref
Video input reference voltage
Measure R,G,B VIDEO_IN voltage
1.6
1.8
2.1
V
IIL
CLAMP GATE low input current
CLAMP GATE
= 0 V
0.5
8
µ
A
IIH
CLAMP GATE high input current
CLAMP GATE
= 12 V
0.005
1
µ
A
Clamp-capacitor charge current
IK(chg)
R,G,B CLAMP CAP = 0 V
850
µ
A
Clamp-capacitor discharge current
IK(dschg)
R,G,B CLAMP CAP = 5 V
850
µ
A
VOL
Low-level output voltage
R,G,B CLAMP CAP = 0 V
0.2
0.6
V
VOH
High-level output voltage
R,G,B CLAMP CAP = 5 V
6.7
7.6
V
Video output blanked voltage
VO(BLANK)
BLANKING = 0 V;
R,G,B CLAMP(+) = 3 V
0.2
0.35
V
High-level output voltage, OSD
VO(OSD BLANK)
OSD BLANKING = 0 V,
VO(PP)(OSD) = 4 V
0.8
V
Output voltage difference
VODIFF
Between any two channels
50
mV
Spot-killer voltage
VSPOT
VCC adjusted to active
8.2
10.3
V
TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ON-SCREEN DISPLAY (OSD) MIXER
SLVS142 DECEMBER 1996
4
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
operating characteristics at 25
°
C free-air temperature, CLAMP GATE = COLOR = 0 V; R,G,B
CLAMP(+) = 2 V, BLANKING = OSD BLANKING = 4 V; CONTRAST = R,G,B GAIN ADJUST = 4 V;
V
CC1
= V
CC2
= 12 V (unless otherwise noted)
PARAMETER
ALTERNATE
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
AV(
)(CONTRAST)
Maximum voltage amplification
AVMAX(
t)
CONTRAST = 4 V,
COLOR = 0 V,
VI(PP) = 700 mV
7.6
V/V
AV(max)(CONTRAST)
Maximum voltage amplification
AVMAX(cont)
CONTRAST = 4 V,
COLOR = 4 V,
VI(PP) = 700 mV
7.6
V/V
tr(video)
Rise time, video output
Tr(video)
VO(PP) = 4 V
3.5
ns
tf(video)
Fall time, video output
Tf(video)
VO(PP) = 4 V
3.5
ns
tr(BLANK)
Rise time, blank output
Tr(BLANK)
BLANKING = 0 V,
Blanking output
VI(PP) = 1 V
7
ns
tf(BLANK)
Fall time, blank output
Tf(BLANK)
BLANKING = 0 V,
Blanking output
VO(PP) = 1 V
7
ns
tr(OSD_BLANK)
Rise time, OSD blank output
Tr(OSD BLANK)
OSD_BLANKING = 0 V;
OSD_ADJUST = 0 V
7
ns
tf(OSD_BLANK)
Fall time, OSD blank output
Tf(OSD BLANK)
OSD_BLANKING = 0 V;
OSD_ADJUST = 0 V
7
ns
tr(OSD_MIXER)
Rise time, OSD mixer
Tr(OSD MIXER)
OSD_BLANKING = 0 V;
VO(PP)(OSD) = 4 V
7
ns
tf(OSD_MIXER)
Fall time, OSD mixer
Tf(OSD MIXER)
OSD_BLANKING = 0 V;
VO(PP)(OSD) = 4 V
7
ns
t d
Propagation delay,
Trprop(OSD)
OSD_BLANKING = 0 V;
VO(PP)(OSD) = 4 V
15
ns
tpd
g
y
video to OSD MIXER
Tfprop(OSD)
OSD_BLANKING = 0 V;
VO(PP)(OSD) = 4 V
15
ns
BW
Bandwidth, amplifier
bw (3dB)
VO(PP) = 4 V,
CLAMP+ = 2 V
100
MHz
TLS1255
VIDEO PREAMPLIFIER SYSTEM
WITH ON-SCREEN DISPLAY (OSD) MIXER
SLVS142 DECEMBER 1996
5
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
APPLICATION INFORMATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
R_OSD_IN
G_OSD_IN
B_OSD_IN
R_VIDEO_IN
R_CLAMP_CAP
G_VIDEO_IN
GND
G_CLAMP_CAP
B_VIDEO_IN
B_CLAMP_CAP
VCC1
CONTRAST
COLOR
CLAMP GATE
OSD_ADJUST
R_GAIN_ADJUST
R_CLAMP(+)
R_VIDEO_OUT
G_GAIN_ADJUST
VCC2
G_VIDEO_OUT
G_CLAMP(+)
B_VIDEO_OUT
B_GAIN_ADJUST
GND
BLANKING
OSD BLANKING
B_CLAMP(+)
0.1
µ
F
4.7
µ
F
75
0.1
µ
F
4.7
µ
F
75
0.1
µ
F
0.1
µ
F
4.7
µ
F
75
0.1
µ
F
0.1
µ
F
4.7
µ
F
0.1
µ
F
0.1
µ
F
0.1
µ
F
0.1
µ
F
390
4 V
To Blue
Cascade Driver
0.1
µ
F
390
To Green
Cascade Driver
0.1
µ
F
4.7
µ
F
390
4 V
To Red
Cascade Driver
0.1
µ
F
4 V
0.1
µ
F
12 V
G_VIDEO_IN
R_VIDEO_IN
B_VIDEO_IN
12 V
47
µ
F
Minimum pulse width = 300 ns
Figure 1. Application and Test Circuit
PDF 
ZIP