Low Cost
Triple CRT Driver
CVA2400A
FEATURES
Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0ns
Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65V
P-P
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V
APPLICATIONS
CRT driver for up to 76kHz Monitors
Excellent Gray Scale Linearity
Emitter Peaking Option
Adjustable Gain
DESCRIPTION
The CVA2400A contains three wide band triple amplifiers,
specifically designed to drive a CRT. It features no crossover
distortion for excellent gray scale linearity, external emitter
peaking to maximize the high frequency gain at the cross hatch
pattern and an adjustable gain for ease of use. This device can
drive monitors with resolutions of 1280 X 1024 (interlaced) with
pixel frequencies of 176MHz.
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
CVA2400A
T11A
0
o
C to +110
o
C
CORPORATION
CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC
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
1Q-42
GND
TAB
7
9
V
CC
11,10,8
V
BIAS
V
OUT
1,3,5
V
IN
2,4,6
Gain/Peaking
Control
= 1200
9
R
1
50
9
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
CVA2400A
FIGURE 1. TEST CIRCUIT
GND
TAB
1Q-43
V
IN
V
BIAS
C1 = 0.01
m
F
C2 = 100
m
F
C3 = 0.1
m
F
C7 = 40pF (TYP)
D1, D2 = FHD400
R1 = 82
9
R2 = 15
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)
CVA2400A
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
30
35
40
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
= 45V
p-p
. T
CASE
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
T
r
Rise Time
6
7
ns
T
f
Fall Time
4.5
5.5
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
CORPORATION
FIGURE 2. APPLICATION CIRCUIT
1Q-44
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 = 150 - 330nH
R1 = 82
W
R2 = 15
W
R3 = 47
W
R4 = 47(1/2W)
W
R5 = 820
W
R3
R4
C4
C3
C2
C1
D2
D1
V 9
CC
7
11,10,8
V
OUT
C5
SPARK
GAP
CVA2400A
R5
L
V
IN
R2
R1
VIDEO
INPUT
5,3,1
C7
V
PG
6,4,2
DC BIAS
APPLICATION INFORMATION
The CVA2400A is a high voltage triple CRT driver suitable for
VGA, Super VGA, IBM
8514, and 1280 x 1024
non-interlaced display applications. The CVA2400A 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 2. Since this is a class A input stage, power supply
current increases as the input signal increases and
consequently power dissipation also increases.
The CVA2400A 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 11W total.
The CVA2400A 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
)
11W
=
4.5
o
C/W
The CVA2400A maximum load is 600
to ground or V
+
.
The output of CVA2400A is not short circuit proof. Any
resistance to V
+
or Ground should be > 600
.
FIGURE 3. CVA2400A DC Characteristics
INPUT VOLTAGE
OUTPUT VO
L
T
A
G
E (
V
)
0
60
90
3
5
7
POWER
DIS
S
IPATI
O
N (
W
)
1
4
6
2
50
80
40
70
30
20
10
3
4
2
1
5
100
110
1Q-45
VOLTAGE
POWER
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2400A
CORPORATION
TYPICAL CHARACTERISTICS
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2400A
V
(
V
)
OUT
I
(
m
A
)
CC
V (VOLTS)
IN
80
70
60
50
40
30
20
10
0
1Q-47
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
OUT
I
CC
vs V vs I
CC
IN
V
OUT
I
(
m
A)
CC
V
(
V
)
OUT
P-
P
50
45
40
35
30
25
20
15
10
5
0
1Q-48
FREQUENCY (MHz)
20
30
50
70
100
80
90
1
10
40
90
80
70
60
50
40
30
20
10
0
I
CC
V
vs FREQUENCY vs
OUT
V
OUT
I
CC
CORPORATION
CVA2400A
1S-35
20ns/DIV
10V/DI
V
CROSS HATCH
WHITE BACKGROUND
2.4ns
202.4ns
-2.75V
7.25V
1S-34
20ns/DIV
10V/DI
V
CROSS HATCH
BLACK BACKGROUND
-47.6ns
152.4ns
-2.75V
7.25V
1S-33
20ns/DIV
10V/DIV
FALL TIME
-40ns
160ns
-3.75V
6.25V
1S-32
20ns/DIV
10V/DIV
RISE TIME
-40ns
160ns
-3.75V
6.25V
TYPICAL CHARACTERISTICS (continued)
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
CORPORATION
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