Improved
Triple 85MHz CRT Driver
CVA2417TX
FEATURES
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz
Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8ns
RiseTime. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4ns
Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
P-P
Excellent Gray Scale Linearity
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V
Pin to Pin Compatible with CVA2415T
APPLICATIONS
CRT Driver for 1280 x 1024 and 1024 x 768 Color
Monitors
DESCRIPTION
The CVA2417TX is an improved version that features
excellent gray scale linearity with no crossover distortion and
less EMI. Designed especially to drive high resolution monitor
for resolution up to 1280 x 1024 (non-interlaced) with pixel
frequency up to 160MHz.
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
CVA2417TX
T11A
-20
o
C to +100
o
C
CORPORATION
CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC
V+
V
BIAS 3 (12V)
V
BIAS 2 (12V)
V
GND
V
V
BIAS 1 (12V)
V
OUT 3
IN 3
IN 2
OUT 2
OUT 1
IN 1
11
10
9
8
7
6
5
4
3
2
1
PIN 1 DESIGNATOR
T11A
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
1H-32
V
OUT
V
IN
3,4,10
1,6,8
2,7,9
V
BIAS
V+
11
Not recommended for new design. See CVA2400A.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V
Storage Temperature . . . . . . . . . . . . . . . . . . -25
o
C to +100
o
C
Operating Temperature . . . . . . . . . . . . . . . . -20
o
C to +100
o
C
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300
o
C
CVA2417TX
FIGURE 1. TEST CIRCUIT
R5
C6
C2
C
L
INPUT
R2
R1
C1
R6
D2
D1
L1
C4
12V
C3
Q1
V
CC
V
R3
R4
OUTPUT
R1 = 8.2k
W
R2 = 2.7k
W
R3 = 10.0K
W
R4 = 34
W
R5 = 1.5k
W
R6 = 150
W
D1 = FDH400
D2 = FDH400
L1 = 560nH
Q1 = 2N5770
C6 = 1.0
m
F
C1 = 0.01
m
F
C2 = 0.01
m
F
C3 = 0.1
m
F
C4 = 0.47
m
F
C = 12pF (Including Parasitics)
L
5
GND
2,7,9
1,6,8
3,4,10
11
1H-33
V
BIAS
V
IN
V
OUT
CVA2417TX
1/3
CC
DC ELECTRICAL CHARACTERISTICS V
S
= 80V, C
L
= 12pF, V
bias
= 12V, V
in
= 3.4V, T
case
= +25
o
C. See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
I
CC
Supply Current @ 1MHz
32
38
mA
I
CC
Supply Current @ 50MHz
55
mA
V
outDC
Output DC Level
40
45
50
V
A
V
Voltage Gain
11
13
15
V
Gain Matching
0.2
dB
AC ELECTRICAL CHARACTERISTICS V
S
= 80V, C
L
= 12pF, V
bias
= 12V, T
case
= +25
o
C. See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
t
r
Rise Time
4.4
6.0
ns
t
f
Fall Time
3.8
5.0
ns
BW
Bandwidth
85
MHz
Le
Linearity
8
%
OS
Overshoot
10
%
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CORPORATION
APPLICATION INFORMATION
The CVA2417TX 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 CVA2417TX
features 80V operation and low power dissipation. 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 2. Since this is a class A input stage, power supply
current increases as the input signal increases and
consequently power dissipation also increases. Average
dissipation per stage is 2.8W, increasing to 4.8W at minimum
output voltage.
The CVA2417TX cannot be used without heat sinking.
Figure
2 shows the power dissipated in each channel over the
operating voltage range of the device, Typical "average"
power dissipation with the device output voltage at one half
the supply voltage is 2.8W per channel for a total dissipation
of 8.4W package dissipation. Under white screen conditions,
i.e.: 15V output, dissipation increases to 4.8W per channel or
14.4W total. The CVA2417TX 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
)
14.4W
=
3.5
o
C/W
The Thermalloy #14754 is one example of a heatsink that
meets this requirement.
The CVA2417TX maximum load is 600
to ground or V
+
.
The output of CVA2417TX is not short circuit proof. Any
resistance to V
+
or Ground should be > 600
.
FALL TIME
VOLTS
10V/DIV
5ns/DIV
10V
80V
BANDWIDTH
100
MHz
1
10
0dB
GA
I
N
10dB/
D
IV
RISE TIME
VO
L
T
S
1
0
V/D
I
V
5ns/DIV
10V
80V
FIGURE 3.
FIGURE 2. CVA2417TX DC Characteristics
CVA2417TX
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
VOLTAGE
POWER
1H-43
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CORPORATION
FIGURE 4. TYPICAL APPLICATION
CVA2417TX
TYPICAL APPLICATION
A typical application of the CVA2417TX is shown in
Figure 4.
12V
R5
C6
C2
C
L
L1
V
CC
R4
OUTPUT
11
DC
RESTORE
C3
FROM
PREAMP
D2
D1
3,4,10
C1
V
OUT
V
BIAS
2,7,9
1,6,8
5
GND
1/3
CVA2417TX
C4
1H-34
V
IN
R1
R2
C1
F
C2
F
C3
F
C4
F
CL*
pF
C6
F
R1
R2
R4
R5
K
D1
D2
L1
nH
Q1
CVA2417
1.0
0.01
0.1
0.43
12
1.0
22
47
34
1.5
FDH400
FDH400
560
2N5770
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
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