Triple 85MHz
CR T Driver
CVA2419TX
FEATURES
••Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz
••Rise/ Fa ll Tim e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <5 .0 ns
••Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 VP-P
••Supply V o ltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V
••Pin to Pin Comp atib le wi th CVA2415, CVA2416,
CVA24 17, LM241 6 and LM 2 419
APPLICATIONS
••CRT Driv er for 1280 x 1024 and 1024 x 768 Col or
Monitors
DESCRIPTION
The CVA2419TX contains th ree wide bandw idth, large signal
amplifiers designed specially to drive high resolution color
mo nitors. T h is device will provide excellent drive cap ability for
the 1280 x 1024 and 1024 x 768 color monitor. The
CVA2419TX is a low cost CRT driver designed to replace
discret e solu tion s.
The part is housed in the industry standard 11-lead TO-220
molded power package. The heat sink is floating and may be
groun ded for ease of manuf actur ing and RFI shieldin g.
ORDERING INFORMATION
Part Package Temperature
CVA2419TX T11A -20oC to +90oC
CORPORATION
CONNECTION DIAGRAM
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 DES IG NAT OR
T11A
ABSOLUTE M AXIM UM R A T INGS
Supply V o ltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V
Storage Temp e rature. . . . . . . . . . . . . . . . . . -25 oC t o +100oCO perat ing Temperature . . . . . . . . . . . . . . . . . -2 0oC to +90oC
Lead Temper ature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300 oC
CVA2419TX
FIGURE 1. TEST CI RCUIT
V
bias
V
in
V
out
GND
R5
C6 C2
C
L
INPUT
R2
R1
C1
R6 D2
D1
L1
C4
12V
C3
Q1
V
CC
R3
R4
OUTPUT
R1 = 7.5K
R2 = 7.5K
R3 = 10.0K
R4 = 34
R5 = 5.1K
R6 = 180
D1 = FDH400
D2 = FDH400
L1 = 560nH
Q1 = 2N5770
C6 = 1.0
m
F
C1 = 0.01
m
F
C2 = 1.0
m
F
C3 = 0.1
m
F
C4 = 0.47
m
F
C = 12pF (Including Parasitics)
L
CVA2419TX
1/3
V
CC
5
GND
2,7,9
1,6,8
3,4,10
11
1T-31
DC ELECTRICA L CHARACT ERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, V out = 5 0Vp-p, Tcase = + 25oC.
See Figure 1 .
SYMBOL CHARACTERISTICS MIN TYP MAX UNITS
ICC Supply Current @ 1MHz 28 36 mA
ICC Supply Current @ 50MHz 50 mA
VoutDC Output DC Level 45 50 55 V
AVVol tage Gain 12 1 5 17 V
Gain Matching 0.2 dB
AC ELECTRICA L CHARACT ERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, V out = 5 0Vp-p, Tcase = + 25oC.
See Figure 1 .
SYMBOL CHARACTERISTICS MIN TYP MAX UNITS
trRi se Time 4 .5 6. 0 ns
tfFall Ti me 4.9 6.0 ns
BW Bandwidth 85 MHz
Le Linearity 6 %
OS Overshoot 6 %
CALOGIC CORPORATION, 237 W hitney Place, F rem o nt , Califo r nia 94 539, Tele phone: 5 10 - 65 6- 2 900, FAX: 510-6 51 - 10 76
CORPORATION
APPLICAT ION INFORMATION
The CVA2419TX is a high voltage triple CRT driver suitable
for VGA, S uper VGA, IBM 8514 1280 x 1024 and 1024 x 768
non-interlaced display applications. The CVA2419TX fe ature s
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 manuf acturing an d RFI shielding.
Thermal Consi de rati ons
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 s tage is 2.5W, increasing to 4.4W at minimum
output voltage.
The CVA2419TX 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 2.5W per channel for a to tal dissipation
of 7.5W package dissipation. Under white screen conditions,
i.e.: 20V output, dissipation increases to 5. 4W per channel or
16W total. The CVA2419TX case temperature must be
maintained below +90oC. If the maximum expected ambient
tem per atur e is + 5 0oC, then a heat s ink is ne ede d with t her m al
resist anc e equal to or less than:
R
th = (90 − 50oC)
16W = 2.5oC/W
The Thermalloy #14754 is one example of a heatsink that
meet s this r equirem en t.
The output of CVA2419TX is not short circuit proof. Any
resist anc e to V+ or Gr ound should be > 600Ω.
FALL TIME
VOLTS
10V/DIV
5ns/DIV
20V
80V
BANDWIDTH
100
MHz
110
GAIN
5dB/DIV
0dB
RISE TIM E
VOLTS
10V/DIV
5ns/DIV
20V
80V
FIGURE 3.
FIGURE 2. CVA2419TX DC Characterist ics
CVA2419TX
CALOGIC CORPORATION, 237 W hitney Place, F rem o nt , Califo r nia 94 539, Tele phone: 5 10 - 65 6- 2 900, FAX: 510-6 51 - 10 76
INPUT VOLTAGE
OUTPUT VOLTAGE (VOLTS)
0
60
90
35
7
POWER DISSIPATION (WATTS)
1462
50
80
40
70
30
20
10
VOLTAGE POWER 3
4
2
1
5
CORPORATION
FIGURE 4. TYPI CAL APPL ICATION
TYPIC AL APPLI CA T ION
A typical application of the CVA2419TX is shown in
Figure 4.
Used in conjunction with a CVA1203, a complete video
channel from monitor input to CRT c athode is shown. In this
application, feedback is local to the CVA1203. An alterna tive
scheme would be feedback from the output of the CVA24 19 to
the positive clamp inputs of the CVA1203. This would prov ide
slightly bet t er b lack level con trol of th e system .
CVA2419TX
1
2
3
4
5
6
7
8
9
10
13
14
11
12
28
27
26
25
24
23
22
21
20
19
16
15
18
17
CVA1203
0.1
m
F
10K
W
10K
W
10K
W
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
10K
W
0.1
m
F
MAX
MIN
10K
W
BLACK LEVEL
GATE IN
10
m
F
+
10
m
F
75
W
30
W
*
VIDEO
IN
R
+
10
m
F
75
W
30
W
*
VIDEO
IN
G
+
10
m
F
75
W
30
W
*
VIDEO
IN
B+
CONTRAST
CONTROL
100
m
F
+
100
W
51
W
RED DRI VE
100
W
51
W
GREEN DRI VE
500
W
390
W
500
W
TO RED
CASCODE
DRIVER
TO BLUE
CASCODE
DRIVER
0.1
m
F
BLACK LEVEL
(BRIGHTNESS)
CONTROL
10K
W
10K
W
91
W
CUTOFF
ADJ.
V
CC
+12V
V
bias
V
in
V
out
R5
C6 C2
C
L
R6 D2
D1
L1
C4
12V
C3
Q1
V
CC
V
CC
R4
OUTPUT
5
GND
2,7,9
1,6,8
3,4,10
11
V
bias
V
in
R6
C4
12V
C3
Q1
2,7,9
1,6,8
V
bias
V
in
R6
C4
12V
C3
Q1
2,7,9
1,6,8
1/3
CVA2419TX
V
out
R5
C6 C2
C
L
D2
D1
L1
V
CC
V
CC
R4
OUTPUT
5
GND
3,4,10
11
1/3
CVA2419TX
V
out
R5
C6 C2
C
L
D2
D1
L1
V
CC
V
CC
R4
OUTPUT
5
GND
3,4,10
11
1/3
CVA2419TX
1C-02
CUTOFF
ADJ.
CUTOFF
ADJ.
TO GREEN
CASCODE
DRIVER
DC
RESTORE
C1
DC
RESTORE
DC
RESTORE
C1
C1
CALOGIC CORPORATION, 237 W hitney Place, F rem o nt , Califo r nia 94 539, Tele phone: 5 10 - 65 6- 2 900, FAX: 510-6 51 - 10 76
C1
µFC2
µFC3
µFC4
µFCL*
pF C6
µFR1
KΩR2
KΩR3
KΩR4
ΩR5
KΩR6
ΩD1 D2 L1
nH Q1
CVA2419TX 1.0 1.0 0.1 0.47 12 1.0 7.5 7.5 10.0 34 5.1 180 FDH400 FDH400 500 2N5770
CORPORATION