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Low Cost Triple CRT Driver
CORPORATION
Preliminary Data Sheet
CVA2403T
FEATURES DESCRIPTION The CVA2403T is a high input impedance wideband triple amplifier. The device is specifically designed to drive a CRT featuring a high speed buffer for easy matching to a pre-amplifier, 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 220MHz. The part is housed in the industry standard 11-lead TO-220 molded power package. The heat sink is grounded. ORDERING INFORMATION Part CVA2403T Package T11A Temperature -20oC to +100oC
* * * * * * * *
Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0ns Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65VP-P Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V High Input Impedance
APPLICATIONS CRT driver for up to 82kHz monitors Excellent Gray Scale Linearity Emitter Peaking Option Adjustable Gain
CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC
11 10 9 8 7 6 5 4 3 2 1
VCC 9
VOUT 1
VOUT 2
R1 = 1000
VCC VOUT 3
VBIAS Gain/Peaking 3 Control VIN 3 Gain/Peaking 2 Control VIN 2 Gain/Peaking 1 Control VIN 1 GND = TAB
12
VOUT 11,10,8
12
VBIAS 7
VIN
TOP VIEW T11A PACKAGE
1,3,5
1N-22
2,4,6 Gain/Peaking Control
GND TAB
1P-38
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2403T
CORPORATION
ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16W Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC
DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Icc VOUT DC Av Supply Current Output DC Level Voltage Gain Gain Matching CHARACTERISTICS MIN 30 40 13 TYP 34 45 15 0.2 MAX 40 50 17 UNITS mA V V dB
AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Tr Tf Le OS Rise Time Fall Time Linearity Overshoot CHARACTERISTICS MIN TYP 4 4 6 5 MAX 4.5 4.5 UNITS ns ns % %
FIGURE 1. TEST CIRCUIT
VCC 9
C3 VBIAS
C1 C2 D1 7 CVA2403T VIN VOUT 8,10,11 D2
C4
C6
VIDEO INPUT
R2 C7
1,3,5
VP G 2,4,6 GND TAB
TEKTRONIX FET PROBE MODEL 6201 (CAP. 1.5pF)
R1
C1 = 0.01F C2 = 100F C3 = 0.1F C7 = 120pF
C4 = 100F C6 = 8pF
R1 = 62 R2 = 20
D1, D2 = FHD400
1P-39
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2403T
CORPORATION
FIGURE 2. APPLICATION CIRCUIT
VCC 9
C3
VBIAS C1 R3 7 C2 CVA2403T D1 VOUT 8,10,11 C5
C4
L
VIN VIDEO INPUT
R2 C7
R4 R5 SPARK GAP
1,3,5
VPG 2,4,6
GND TAB
D2 DC BIAS
R1
R1 = 62 R2 = 20 R3 = 47 R4 = 47(1/2W) R7 = 33 R8 = 39 R10 = 680
C1 = 0.01F C2 = 100F C3 = 0.1F C4 = 100F C5 = 2.2F C7 = 40 - 120pf
D1, D2 = FHD400 L = 330 - 390nH
1P-40
APPLICATION INFORMATION The CVA2403T is a high voltage triple CRT driver suitable for VGA, Super VGA, IBM(R) 8514, 1280 x 1024 and 1024 x 768 non-interlaced display applications. The CVA2403T 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 CVA2403T 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 CVA2403T case temperature must be maintained below +90oC. If the maximum expected ambient temperature is +50oC, then a heat sink is needed with thermal resistance equal to or less than: Rth = (90 - 50oC) = 2.5oC/W 16W
FIGURE 3. CVA2403T DC Characteristics
6 110 100 90 80 70 60 50 40 30 20 10 0 1
POWER DISSIPATION (WATTS) OUTPUT VOLTAGE (VOLTS)
5 4
VOLTAGE POWER
3 2 1
2
3
4
5
6
7
1G-26
INPUT VOLTAGE
The CVA2403T maximum load is 600 to ground or V+. The output of CVA2403T 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
CVA2403T
CORPORATION
TYPICAL CHARACTERISTICS
RISE TIME
WITH PEAKING INDUCTOR & CAPACITOR
FALL TIME
WITH PEAKING INDUCTOR & CAPACITOR
30V
30V
8V/DIV
10V 10ns/DIV
1D-02
8V/DIV
10V 10ns/DIV
1D-03
RISE TIME
WITH PEAKING CAPACITOR (NO INDUCTOR)
FALL TIME
WITH PEAKING CAPACITOR (NO INDUCTOR)
90V
90V
8V/DIV
10V 10ns/DIV
1D-04
8V/DIV
10V 10ns/DIV
1D-05
RISE TIME
NO PEAKING INDUCTOR OR CAPACITOR
FALL TIME
NO PEAKING INDUCTOR OR CAPACITOR
120.5V
120.5V
10V/DIV
2.5V 10ns/DIV
1D-06
10V/DIV
2.5V 10ns/DIV
1D-07
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
CVA2401T
CORPORATION

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