LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Copyright
1991, Texas Instruments Incorporated
1
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.
BW ( 3 dB) . . . 70 MHz
Matched
0.5-dB Attenuators for Contrast
Control
Three Externally-Gated Comparators for
Brightness Control
Independent Gain Control of Each Video
Amplifier . . . A
V
= 4 to 10
Video Input Voltage Reference
Low-Impedance Output Driver
ESD Protection Exceeds 2000 V Per MIL
Standard 833C, Method 3015
Designed to Be an Improved Replacement
for National Semiconductor LM1203
description
The LM1203 and LM1203A are wide-band video amplifier systems intended for high-resolution RGB color
monitor applications. In addition to three matched video amplifiers, the LM1203 and LM1203A contain three
gated differential input black-level clamp comparators for brightness control and three matched attenuator
circuits for contrast control. Each video amplifier contains a gain set for adjusting maximum system gain
(A
V
= 4 to 10) as well as providing trim capability. The LM1203 and LM1203A also contain a voltage reference
for the video inputs.
The LM1203 and LM1203A are characterized for operation from 0
C to 70
C.
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
V
CC1
CONTRAST CAP
CONTRAST CAP
R VIDEO IN
R CLAMP CAP
G VIDEO IN
GND
G CLAMP CAP
B VIDEO IN
B CLAMP CAP
REF
CONTRAST
V
CC1
CLAMP GATE
V
CC1
R GAIN ADJUST
R CLAMP()
R VIDEO OUT
R CLAMP(+)
V
CC2
G GAIN ADJUST
G CLAMP()
G VIDEO OUT
G CLAMP(+)
B GAIN ADJUST
B CLAMP()
B VIDEO OUT
B CLAMP(+)
N PACKAGE
(T0P VIEW)
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
2
functional block diagram
+
+
+
14
1.4 V
13
CONTRAST
12
REF
11
CAP
B CLAMP 10
ref
2.4 V
B VIDEO IN
9
CAP
G CLAMP 8
GND
7
G VIDEO IN
6
R CLAMP CAP 5
R VIDEO IN
4
3
CONTRAST CAP
CONTRAST CAP
2
1
Control
Contrast
B CLAMP(+)
15
B CLAMP()
17
B GAIN ADJUST
18
B VIDEO OUT
16
G CLAMP(+)
19
G CLAMP()
21
G GAIN ADJUST
22
G VIDEO OUT
20
23
R CLAMP(+)
24
R CLAMP()
26
R GAIN ADJUST
27
R VIDEO OUT
25
VCC1
VCC1
CLAMP GATE
VCC2
40
1 k
100
VCC1
28
1 k
1 k
100
100
40
40
RED
GREEN
BLUE
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
V
CC
V
I
GND
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video output current
28 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total power dissipation at (or below) 25
C free-air temperature (see Note 2)
2.5 W
. . . . . . . . . . . . . . . . . . . . .
Operating junction temperature
150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTES: 1. All VCC pins must be externally wired together to prevent internal damage during VCC power-on/off cycles.
2. For operating above 25
C free-air temperature, derate linearly at the rate of 20 mW/
C.
VOdiff
Output voltage difference between any two channels
mV
0.5
50
40
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3
electrical characteristics at 25
C free-air temperature, V
12
= 6 V, V
14
= 0, V
15
= 2 V, V
CC1
= V
CC2
= 12 V (see Figure 1) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ICC
Supply current
VCC1 only
60
90
mA
Vref
Video input reference voltage
2.2
2.4
2.6
V
IIB
Video input bias current
Any amplifier
5
20
A
VIL(14)
Clamp gate low-level input voltage
Clamp comparators on
0.8
1.2
V
VIH(14)
Clamp gate high-level input voltage
Clamp comparators off
1.6
2
V
IIL(14)
Clamp gate low input current
V14 = 0
0.5
5
A
IIH(14)
Clamp gate high input current
V14 = VCC
0.005
1
A
IK(chg)
Clamp capacitor charge current
V5,8 or 10 = 0
850
A
IK(dschg)
Clamp capacitor discharge current
V5,8 or 10 = 5 V
850
A
VOL
Low-level output voltage
V5,8 or 10 = 0
1.2
V
VOH
High-level output voltage
V5,8 or 10 = 5 V
8.9
V
V15 = 2 V
V15 = 4 V
operating characteristics at 25
C free-air temperature, V
14
= 0 V, V
15
= 4 V, f
in
= 10 kHz (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
AVmax
Maximum voltage amplification
V12 = 12 V,
VI(PP) = 560 mV
LM1203
LM1203A
8.8
7.8
V/V
AVmid
Mid-range voltage amplification
V12 = 5 V,
VI(PP) = 560 mV
LM1203
LM1203A
3.5
2.5
V/V
V12low
Contrast voltage for minimum
amplification
VI(PP) = 1 V,
See Note 3
2
V
AVmax(diff)
Amplification match at AV max
V12 = 12 V,
See Note 4
0.2
dB
AVmid(diff)
Amplification match at AV mid
V12 = 5 V,
See Note 3
0.2
dB
AVlow(diff)
Amplification match at AV low
V12 = V12low, See Notes 3 and 4
0.2
dB
THD
Total harmonic distortion
V12 = 3 V,
VI(PP) = 1 V
0.5
%
BW( 3 dB)
Amplifier bandwidth
V12 = 12 V,
See Notes 5 and 7
70
MHz
V12 = 12 V,
f = 10 kHz,
See Note 6
60
ax
Crosstalk attenuation
V12 = 12 V,
f = 10 MHz,
dB
See Notes 6 and 7
NOTES: 3. Determine V12low for 40-dB attenuation of output. Reference to AV maximum.
4. Measure gain difference between any two amplifiers, VI(PP) = 1 V.
5. Adjust input frequency from 10 kHz (AV maximum ref level) to the 3-dB corner frequency (f 3 dB). VI(PP) = 560 mV.
6. VI(PP) = 560 mV at f = 10 kHz to any amplifier. Measure output levels of the other two undriven amplifiers relative to driven amplifier
to determine channel separation. Terminate the undriven amplifier inputs to simulate generator loading. Repeat test at f = 10 MHz for
ax = 10 MHz.
7. A special text fixture without a socket is required.
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
4
D.U.T.
LM1203A
R GAIN ADJUST
R CLAMP()
R VIDEO OUT
R CLAMP(+)
G GAIN ADJUST
G CLAMP()
G VIDEO OUT
G CLAMP(+)
B GAIN ADJUST
B CLAMP()
B VIDEO OUT
B CLAMP(+)
14
CONTRAST
REF
B CLAMP CAP
B VIDEO IN
G CLAMP CAP
GND
G VIDEO IN
R CLAMP CAP
R VIDEO IN
CONTRAST CAP
CONTRAST CAP
28
27
26
25
24
12 V
10
F
S26
S21
330
3.3 k
15
V
SET
LEVEL
BLACK
23
22
21
20
19
100
18
B OUT
330
S17
17
16
15
CLAMP GATE
0.01
F
13
12
CONTRAST
V REF
11
10
9
8
7
6
4
5
3
2
0.01
F
1
VCC1
VCC1
VCC1
VCC2
VCC
5
F
50
5
F
50
5
F
50
5
F
330
100
100
10 k
10 k
10 k
10 k
10 k
10 k
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
CLAMP GATE
R IN
G IN
B IN
V11
V12
V14
G OUT
R OUT
Figure 1. Test Circuit
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
5
0.01
F
Control
(Brightness)
Black Level
Driver
Cascode
To Blue
Adj.
Cutoff
Green
Cascode
Driver
Supply
To LV
60 V PP
VIDEO OUT
Supply
To HV
Green Drive
Driver
Cascode
To Red
+
100
F
GATE IN
BLACK LEVEL
Control
Contrast
MIN
Max
B
VIDEO
IN
G
VIDEO
IN
R
VIDEO
IN
R GAIN ADJUST
R CLAMP()
R VIDEO OUT
R CLAMP(+)
G GAIN ADJUST
G CLAMP()
G VIDEO OUT
G CLAMP(+)
B GAIN ADJUST
B CLAMP()
B VIDEO OUT
B CLAMP(+)
CLAMP GATE
14
CONTRAST
REF
B CLAMP CAP
B VIDEO IN
G CLAMP CAP
GND
G VIDEO IN
R CLAMP CAP
R VIDEO IN
CONTRAST CAP
CONTRAST CAP
28
27
26
25
24
12 V
23
22
21
20
19
18
17
16
15
13
12
11
10
9
8
7
6
4
5
3
2
1
VCC1
VCC
VCC1
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0.01
F
0.1
F
10 k
5
F
75
10 k
5
F
75
10 k
5
F
10 k
75
5
F
10 k
VCC2
51
100
390
51
100
390
91
390
10 k
10 k
1 k
VCC1
51
1 k
Red Drive
Figure 2. Typical Application
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
6
7
To Clamp Comparator (+) Input
or
To Clamp Comparator () Input
VIDEO
OUT
27
RE
500
RL
H V
L V
23
40
16,20,or 25
VIDEO
OUT
V
390
R19
Q12
28
5, 8, or 10
Clamp
Cap 0.1
F
700
Q11
Q10
91
51
100
R11
Q9
1 k
R10
Q8
5.4 V
Z1
700
12 V
100
F
13
1
LM1203A
1 k
R3
Q7
R5
Q6
Q5
500
R2
R1
Q2
Q1
Optional
16 k
11
IN
VIDEO
10 k
10
F
4, 6, or 9
0.02
F
3
2
CONTRAST
CAP
Q4
Q3
75
VCC1
VCC1
1.6 k
100
VCC1
VCC2
40
Figure 3. Simplified Video Amplifier Section With Recommended External Components
To Video Input
10 k
11
1 k
R22
D2
D1
Z3
4.3 k
R21
D4
D3
R24
5 k
R23
CONTRAST
CAP
CAP
CONTRAST
CONTROL
CONTRAST
2
3
12
8 k
R29
Q17
Q15A
R30
Q16
Q15
4.7 k
R27
12 k
R28
R27A
Q14
10 k
R26
128
R25
Q13
10 k
10 k
5 k
320
VCC1
10 k
Figure 4. Input Voltage Reference and Contrast Control Circuits
LM1203, LM1203A
RGB VIDEO AMPLIFIER SYSTEMS
SLFS048 MARCH 1990 REVISED OCTOBER 1991
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
7
850
A
GATE
CLAMP 14
Q18
5 k
R23
Q21
Q19
To Other Channels
Q28
Q26
10 k
R34
CLAMP+
15,19, or 24
CLAMP
17,21, or 28
CAP
CLAMP
5,8,or 10
Q27
Q25
20 k
R23
Q22
Q23
Q24
VCC1
R35
20 k
Figure 5. Simplified Schematic of LM1203A Clamp Gate
(Common to Each Channel) and Clamp Comparator Circuits
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Copyright
1998, Texas Instruments Incorporated
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