Low Cost
Triple CRT Driver
CVA2422TL
FEATURES
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90MHz
Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0ns
Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70V
P-P
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V
APPLICATIONS
CRT driver for up to 82kHz monitors with resolution up
to 1280 x 1024.
DESCRIPTION
The CVA2422TL contains three cascode video driver amplifiers
without a common emitter. This device is designed for ease of
use, adjustable gain, controlled EMI, OSD, and external peaking.
The part is housed in the industry standard 11-lead TO-220
molded power package. The heat sink is floating and may be
grounded for ease of manufacturing and RFI shielding.
ORDERING INFORMATION
Part
Package
Temperature
CVA2422TL
T11A
-20
o
C to +90
o
C
CORPORATION
CONNECTION DIAGRAM
V+
OUT 3
IN 3
IN 2
11
10
9
8
7
6
5
4
3
2
1
OUT 2
OUT 1
IN 1
TOP VIEW
T11A PACKAGE
V
V
V
V
GND
V
V
V
BIAS 2
V
BIAS 1
V
BIAS 3
1C-46
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
= 1000
R
1
1D-18
GND
5
2,7,9
11
V
CC
3,4,10
12
12
V
in
1,6,8
V
B
V
O
ABSOLUTE MAXIMUM RATINGS
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16W
Storage Temperature . . . . . . . . . . . . . . . . . . . -25
o
C to +100
o
C
Operating Temperature . . . . . . . . . . . . . . . . . . -20
o
C to +90
o
C
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300
o
C
CVA2422TL
FIGURE 1. TEST CIRCUIT
GND 5
1G-30
V
IN
V
BIAS
Q1
C1 = 0.01
F
C2 = 100
F
C3 = 0.1
F
Q1 = 2N3904
D1, D2 = FHD400
R1 = 62
R2 = 120
R3 = 180
R4 = 47
C4 = 100
F
C5 = 2.2
F
C6 = 8pF (INCLUDING
PARASITIC)
R3
R2
R4
R1
C6
C4
C3
C2
C1
D2
D1
VIDEO
INPUT
CVA2422TL
V 11
CC
1,6,8
2,7,9
3,4,10
V
OUT
C5
DC ELECTRICAL CHARACTERISTICS V
s
= 80V, C
L
= 8pF, DC
INPUT BIAS
= 12V, V
IN
= 3.4V, V
OUT
= 50V
p-p
. T
CASE
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
I
cc
Supply Current @ 1MHz
34
40
mA
I
cc
Supply Current @ 50MHz
58
mA
V
OUT DC
Output DC Level
40
45
50
V
A
v
Voltage Gain
12
15
17
V
Gain Matching
0.2
dB
AC ELECTRICAL CHARACTERISTICS V
s
= 80V, C
L
= 8pF, DC
INPUT BIAS
= 12V, V
IN
= 3.4V, V
OUT
= 50V
p-p
. T
CASE
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
T
r
Rise Time
5
6
ns
T
f
Fall Time
5
6
ns
BW
Bandwidth
90
MHz
L
e
Linearity
6
%
OS
Overshoot
6
%
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CORPORATION
CVA2422TL
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
FIGURE 2. APPLICATION CIRCUIT
FIGURE 3. APPLICATION CIRCUIT
GND 5
1G-31
V
IN
V
BIAS
Q2
C1 = 0.01
F
C2 = 100
F
C3 = 0.1
F
C4 = 100
F
C5 = 2.2
F
C6 = 40 - 120pf
C7 = 40 - 120pf
Q1 = 2N3904
Q2 = 2N3904
D1, D2 = FHD400
R1 = 62
R2 = 62
R3 = 180
R4 = 47(1/2W)
R5 = 120
R6 = 7.5K
R7 = 33
R8 = 39
R9 = 56
R3
R5
R4
C4
C3
C2
C1
D2
D1
VIDEO INPUT
Tr,Tf = <4ns
V 11
CC
1,6,8
2,7,9
3,4,10
V
OUT
C5
SPARK
GAP
Q1
R1
R2
CVA2422TL
R9
C7
R8
OSD
R6
R7
C6
1G-32
GND 5
V
IN
V
BIAS
Q2
C1 = 0.01
F
C2 = 100
F
C3 = 0.1
F
C4 = 100
F
C5 = 2.2
F
C6 = 40 - 120pf
C7 = 40 - 120pf
Q1 = 2N3904
Q2 = 2N3904
D1, D2 = FHD400
L = 330 - 390nH
R1 = 62
R2 = 62
R3 = 180
R4 = 47(1/2W)
R5 = 120
R6 = 7.5K
R7 = 33
R8 = 39
R9 = 56
R10 = 680
R3
R5
R4
C4
C3
C2
C1
D2
D1
VIDEO INPUT
Tr,Tf = <4ns
V 11
CC
1,6,8
2,7,9
3,4,10
V
OUT
C5
SPARK
GAP
Q1
R1
R2
CVA2422TL
R10
L
R9
C7
R8
OSD
R6
R7
C6
CORPORATION
CVA2422TL
APPLICATION INFORMATION
The CVA2422TL 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 CVA2422TL features
80V operation. The part is housed in the industry standard 11
lead TO-220 molded power package. The heat sink is floating
and may be grounded for ease of manufacturing and RFI
shielding.
Thermal Considerations
The transfer characteristics of the amplifier are shown in
Figure 4. Since this is a class A input stage, power supply
current increases as the input signal increases and
consequently power dissipation also increases.
The CVA2422TL cannot be used without heat sinking.
Figure
2 shows the power dissipated in each channel over the
operating voltage range of the device. Under white screen
conditions, i.e.: 20V output, dissipation increases to 16W
total. The CVA2422TL case temperature must be maintained
below +90
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
=
(
90
-
50
o
C
)
16W
=
2.5
o
C/W
The CVA2422TL maximum load is 600
to ground or V
+
.
The output of CVA2422TL is not short circuit proof. Any
resistance to V
+
or Ground should be > 600
.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
FIGURE 4. CVA2422TL DC Characteristics
INPUT VOLTAGE
OUTPUT VOLTAGE (VOLTS)
0
60
90
3
5
7
POWER DISSIPATION (WATTS)
1
4
6
2
50
80
40
70
30
20
10
3
4
2
1
5
100
110
6
VOLTAGE
POWER
1G-26
CORPORATION
10ns/DIV
8V/DIV
30V
10V
1D-03
FALL TIME
WITH PEAKING
INDUCTOR & CAPACITOR
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
90V
10V
1D-04
RISE TIME
WITH PEAKING
CAPACITOR (NO INDUCTOR)
TYPICAL CHARACTERISTICS
10ns/DIV
10V/DIV
120.5V
2.5V
1D-07
FALL TIME
NO PEAKING
INDUCTOR OR CAPACITOR
10ns/DIV
10V/DIV
120.5V
2.5V
1D-06
RISE TIME
NO PEAKING
INDUCTOR OR CAPACITOR
CVA2422TL
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
PDF 
ZIP