Low Cost
Triple CRT Driver
CVA2401T
FEATURES
Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0ns
Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65V
P-P
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V
APPLICATIONS
CRT driver for up to 89kHz monitors with resolution up
to 1280 x 1024.
Excellent Gray Scale Linearity
Emitter Peaking Option
Adjustable Gain
DESCRIPTION
The CVA2401T contains three wideband amplifiers, designed
specifically to drive a CRT. It features no crossover distortion for
excellent gray scale linearity, external emitter peaking to
maximize the high frequency gain at cross hatch pattern and
adjustable gain for ease of use This device can drive monitors
with resolutions of 1280 x 1024 (non-interlaced) with pixel
frequency of 210MHz.
The part is housed in the industry standard 11-lead TO-220
molded power package. The heat sink is grounded.
ORDERING INFORMATION
Part
Package
Temperature
CVA2401T
T11A
0
o
C to +110
o
C
CORPORATION
CONNECTION DIAGRAM
OUT
OUT
11
10
9
8
7
6
5
4
3
2
1
IN
TOP VIEW
T11A PACKAGE
V
V
V
Gain/Peaking
Control
V
BIAS
V
CC
1N-22
OUT
V
IN
V
Gain/Peaking
Control
Gain/Peaking
Control
IN
V
GND = TAB
1
2
3
3
3
2
2
1
1
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
= 1000
R
1
1N-23
GND
TAB
7
9
V
CC
11,10,8
50
V
B
V
O
1,3,5
V
IN
2,4,6
Gain/Peaking
Control
Preliminary Data Sheet
ABSOLUTE MAXIMUM RATINGS
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V
Storage Temperature . . . . . . . . . . . . . . . . . . . -25
o
C to +125
o
C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +175
o
C
Case Temperature . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to +110
o
C
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300
o
C
CVA2401T
CORPORATION
FIGURE 1. TEST CIRCUIT
GND
TAB
1Q-35
V
IN
V
BIAS
C1 = 0.01
m
F
C2 = 100
m
F
C3 = 0.1
m
F
C7 = 120pF
D1, D2 = FHD400
R1 = 68
9
R2 = 20
9
C4 = 100
m
F
C6 = 8pF
R2
R1
C6
C4
C3
C2
C1
D2
D1
VIDEO
INPUT
V 9
CC
1,3,5
7
11,10,8
V
OUT
C7
V
P G
2,4,6
TEKTRONIX
FET PROBE
MODEL 6201
(CAP. 1.5pF)
CVA2401T
DC ELECTRICAL CHARACTERISTICS V
s
= 80V, C
L
= 8pF, DC
INPUT BIAS
= 12V, V
IN
= 3.2V, V
OUT
= 50V
p-p
. T
CASE
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
I
cc
Supply Current
38
43
48
mA
V
OUT DC
Output DC Level
40
45
50
V
A
v
Voltage Gain
14
14.4
15
V
R
IN
Input Impedance
10,000
12,000
20,000
Gain Matching
0.2
0.7
dB
AC ELECTRICAL CHARACTERISTICS V
s
= 80V, C
L
= 8pF, DC
INPUT BIAS
= 12V, V
IN
= 3.2V, V
OUT
= 50V
p-p
. T
CASE
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
T
r
Rise Time
4
5.0
ns
T
f
Fall Time
4
5.0
ns
L
e
Linearity
6
%
OS
Overshoot
3
7
%
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
FIGURE 2. APPLICATION CIRCUIT
1Q-36
GND
TAB
V
BIAS
C1 = 0.01
m
F
C2 = 100
m
F
C3 = 0.1
m
F
C4 = 100
m
F
C5 = 2.2
m
F
C7 = 40 - 120pf
D1, D2 = FHD400
L = 330 - 390nH
R1 = 68
W
R2 = 20
W
R3 = 47
W
R4 = 47(1/2W)
W
R7 = 33
W
R8 = 39
W
R10 = 680
W
R3
R4
C4
C3
C2
C1
D2
D1
V 9
CC
7
11,10,8
V
OUT
C5
SPARK
GAP
CVA2401T
R5
L
V
IN
R2
R1
VIDEO
INPUT
1,3,5
C7
V
PG
2,4,6
DC BIAS
APPLICATION INFORMATION
The CVA2401T is a high voltage triple CRT driver suitable for
VGA, Super VGA, IBM
8514, 1280 x 1024 and 1024 x 768
non-interlaced display applications. The CVA2401T features
80V operation. The part is housed in the industry standard 11
lead TO-220 molded power package. The heat sink is
grounded for ease of manufacturing and RFI shielding.
Thermal Considerations
The transfer characteristics of the amplifier are shown in
Figure 3. Since this is a class A input stage, power supply
current increases as the input signal increases and
consequently power dissipation also increases.
The CVA2401T cannot be used without heat sinking.
Figure 3
shows the power dissipated in each channel over the
operating voltage range of the device. Under white screen
conditions, i.e.: 25V output, dissipation increases to 13.2W
total. The CVA2401T case temperature must be maintained
below +100
o
C. If the maximum expected ambient
temperature is +50
o
C, then a heat sink is needed with thermal
resistance equal to or less than:
R
th
=
(
100
-
50
o
C
)
13.2W
=
3.8
o
C/W
The CVA2401T maximum load is 600
to ground or V
+
.
The output of CVA2401T is not short circuit proof. Any resistance
to V
+
or Ground should be > 600
.
FIGURE 3. CVA2401T DC Characteristics
INPUT VOLTAGE
OUTPUT VO
L
T
A
G
E (
V
)
0
60
90
3
5
7
POWER
DISS
I
PATI
O
N (
W
)
1
4
6
2
50
80
40
70
30
20
10
3
4
2
1
5
100
110
6
1S-36
120
VOLTAGE
POWER
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2401T
CORPORATION
CVA2401T
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
TYPICAL CHARACTERISTICS
I
(
m
A)
CC
V
(
V
)
OUT
P-
P
50
45
40
35
30
25
20
15
10
5
0
1S-37
FREQUENCY (MHz)
20
30
50
70
100
80
90
1
10
40
90
80
70
60
50
30
40
20
10
0
I
CC
V
vs FREQUENCY vs
OUT
110
V
OUT
I
CC
V
(
V
)
OUT
I
(
m
A
)
CC
V (VOLTS)
IN
80
70
60
50
40
30
20
10
0
1S-38
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
6.0
5.5
80
70
60
50
40
30
20
10
0
V
vs V
OUT
IN
vs I
CC
V
OUT
I
CC
1V-03
20ns/DIV
10V/DI
V
CROSS HATCH
WHITE BACKGROUND
2.4ns
202.4ns
-4.75V
5.25V
1V-04
20ns/DIV
10V/DI
V
CROSS HATCH
BLACK BACKGROUND
-40ns
160ns
-4.75V
4.25V
CVA2401T
CORPORATION
TYPICAL CHARACTERISTICS (continued)
10ns/DIV
8V/DIV
90V
10V
1D-04
RISE TIME
WITH PEAKING
CAPACITOR (NO INDUCTOR)
10ns/DIV
8V/DIV
30V
10V
1D-02
RISE TIME
WITH PEAKING
INDUCTOR & CAPACITOR
10ns/DIV
8V/DIV
90V
10V
1D-05
FALL TIME
WITH PEAKING
CAPACITOR (NO INDUCTOR)
10ns/DIV
8V/DIV
30V
10V
1D-03
FALL TIME
WITH PEAKING
INDUCTOR & CAPACITOR
10ns/DIV
10V/DIV
120.5V
2.5V
1D-06
RISE TIME
NO PEAKING
INDUCTOR OR CAPACITOR
10ns/DIV
10V/DIV
120.5V
2.5V
1D-07
FALL TIME
NO PEAKING
INDUCTOR OR CAPACITOR
Information furnished by Calogic is believed to be accurate and reliable. However, no responsibility is assumed for its use: nor for any infringement of patents or other
rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Calogic.
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
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