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| Low Cost Triple CRT Driver CORPORATION Preliminary Data Sheet CVA2401T FEATURES DESCRIPTION The CVA2401T contains three wideband amplifiers, designed specifically to drive a CRT. It features no crossover distortion for excellent gray scale linearity, external emitter peaking to maximize the high frequency gain at cross hatch pattern and adjustable gain for ease of use This device can drive monitors with resolutions of 1280 x 1024 (non-interlaced) with pixel frequency of 210MHz. The part is housed in the industry standard 11-lead TO-220 molded power package. The heat sink is grounded. ORDERING INFORMATION Part CVA2401T Package T11A Temperature 0oC to +110oC * * * * * * * Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0ns Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65VP-P Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V APPLICATIONS CRT driver for up to 89kHz monitors with resolution up to 1280 x 1024. Excellent Gray Scale Linearity Emitter Peaking Option Adjustable Gain CONNECTION DIAGRAM 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 VO 11,10,8 VB 50 7 VIN 1,3,5 1N-22 TOP VIEW T11A PACKAGE 2,4,6 Gain/Peaking Control GND TAB 1N-23 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2401T CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +125oC Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +175oC Case Temperature . . . . . . . . . . . . . . . . . . . . . . . 0oC to +110oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.2V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1. SYMBOL Icc VOUT DC Av RIN Supply Current Output DC Level Voltage Gain Input Impedance Gain Matching CHARACTERISTICS MIN 38 40 14 10,000 TYP 43 45 14.4 12,000 0.2 MAX 48 50 15 20,000 0.7 UNITS mA V V dB AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.2V, 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 3 7 MAX 5.0 5.0 UNITS ns ns % % FIGURE 1. TEST CIRCUIT VCC 9 C3 VBIAS C1 C2 D1 7 CVA2401T VIN VOUT 11,10,8 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 = 0.01mF C2 = 100mF C3 = 0.1mF C7 = 120pF C4 = 100mF C6 = 8pF R1 = 689 R2 = 209 D1, D2 = FHD400 1Q-35 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2401T CORPORATION FIGURE 2. APPLICATION CIRCUIT VCC 9 C3 VBIAS C1 R3 7 C2 CVA2401T D1 VOUT 11,10,8 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 = 68W R2 = 20W R3 = 47W R4 = 47(1/2W)W R7 = 33W R8 = 39W R10 = 680W C1 = 0.01mF C2 = 100mF C3 = 0.1mF C4 = 100mF C5 = 2.2mF C7 = 40 - 120pf D1, D2 = FHD400 L = 330 - 390nH 1Q-36 APPLICATION INFORMATION The CVA2401T 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 CVA2401T 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 3. Since this is a class A input stage, power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA2401T 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 13.2W total. The CVA2401T case temperature must be maintained If the maximum expected ambient below +100oC. temperature is +50oC, then a heat sink is needed with thermal resistance equal to or less than: Rth = (100 - 50oC) = 3.8oC/W 13.2W FIGURE 3. CVA2401T DC Characteristics 120 110 100 90 80 70 60 50 40 30 20 10 0 6 5 4 3 2 1 POWER DISSIPATION (W) OUTPUT VOLTAGE (V) VOLTAGE POWER 1 2 3 4 5 6 7 1S-36 INPUT VOLTAGE The CVA2401T maximum load is 600 to ground or V+. The output of CVA2401T 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 CVA2401T CORPORATION TYPICAL CHARACTERISTICS VOUT vs FREQUENCY vs I CC 50 45 40 35 VOUT (VP-P) 30 25 20 15 10 5 0 1 10 20 30 40 50 70 FREQUENCY (MHz) 80 90 100 110 1S-37 VOUT 90 80 70 60 I CC (mA) I CC 50 30 40 20 10 0 VOUT vs VIN vs I CC 80 70 VOUT 60 50 V OUT (V) 80 70 60 50 I CC (mA) 40 30 I CC 20 10 0 40 30 20 10 0 6.0 1S-38 0 0.5 1.0 1.5 2.0 2.5 3.0 VIN (VOLTS) 3.5 4.0 4.5 5.0 5.5 CROSS HATCH WHITE BACKGROUND 5.25V 4.25V CROSS HATCH BLACK BACKGROUND 10V/DIV -4.75V 2.4ns 20ns/DIV 202.4ns 1V-03 -4.75V -40ns 20ns/DIV 10V/DIV 160ns 1V-04 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2401T CORPORATION TYPICAL CHARACTERISTICS (continued) 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 |
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