Low Cost Triple CRT Driver CORPORATION Preliminary Data Sheet CVA2403T FEATURES • • • • DESCRIPTION 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 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 Package Temperature CVA2403T T11A -20oC to +100oC CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC VCC 9 11 10 9 8 VOUT 1 VCC VOUT 3 7 6 5 4 3 2 1 R1 = 1000Ω VOUT 2 12Ω VBIAS Gain/Peaking 2 Control VIN 2 Gain/Peaking 1 Control VIN 1 12Ω VBIAS 7 VIN GND = TAB TOP VIEW T11A PACKAGE VOUT 11,10,8 Gain/Peaking 3 Control VIN 3 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 CHARACTERISTICS MIN TYP MAX UNITS Icc Supply Current 30 34 40 mA VOUT DC Output DC Level 40 45 50 V Av Voltage Gain 13 15 17 V Gain Matching 0.2 dB AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS Tr Rise Time 4 4.5 ns Tf Fall Time 4 4.5 ns Le Linearity 6 % OS Overshoot 5 % FIGURE 1. TEST CIRCUIT VCC 9 C3 D1 VBIAS C1 C4 7 CVA2403T C2 VIN VIDEO INPUT 1,3,5 C7 C1 = 0.01µF C2 = 100µF C3 = 0.1µF C7 = 120pF R1 8,10,11 C6 D2 VP G 2,4,6 R2 VOUT TEKTRONIX FET PROBE MODEL 6201 (CAP. 1.5pF) GND TAB C4 = 100µF C6 = 8pF R1 = 62Ω R2 = 20Ω 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 D1 7 C2 CVA2403T VIN VIDEO INPUT 1,3,5 L VOUT 8,10,11 R1 R5 SPARK GAP D2 VPG 2,4,6 DC BIAS GND TAB R1 = 62Ω R2 = 20Ω R3 = 47Ω R4 = 47(1/2W)Ω R7 = 33Ω R8 = 39Ω R10 = 680Ω 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: C1 = 0.01µF C2 = 100µF C3 = 0.1µF C4 = 100µF C5 = 2.2µF C7 = 40 - 120pf D1, D2 = FHD400 L = 330 - 390nH 1P-40 FIGURE 3. CVA2403T DC Characteristics 6 110 100 90 80 70 60 50 40 30 20 10 5 4 VOLTAGE POWER 3 2 1 0 1 2 3 4 5 INPUT VOLTAGE 6 POWER DISSIPATION (WATTS) The CVA2403T 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 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. OUTPUT VOLTAGE (VOLTS) APPLICATION INFORMATION Rth = R4 C5 R2 C7 C4 7 1G-26 (90 − 50oC) = 2.5oC/W 16W The CVA2403T maximum load is 600Ω to ground or V+. The output of CVA2403T is not short circuit proof. Any resistance to V+ or Ground should be > 600Ω. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2403T CORPORATION TYPICAL CHARACTERISTICS RISE TIME FALL TIME WITH PEAKING INDUCTOR & CAPACITOR WITH PEAKING INDUCTOR & CAPACITOR 8V/DIV 30V 8V/DIV 30V 10V 10V 10ns/DIV 10ns/DIV 1D-02 RISE TIME FALL TIME WITH PEAKING CAPACITOR (NO INDUCTOR) WITH PEAKING CAPACITOR (NO INDUCTOR) 8V/DIV 90V 8V/DIV 90V 1D-03 10V 10V 10ns/DIV 10ns/DIV 1D-04 NO PEAKING INDUCTOR OR CAPACITOR 120.5V 120.5V 10V/DIV FALL TIME NO PEAKING INDUCTOR OR CAPACITOR 10V/DIV RISE TIME 2.5V 1D-05 2.5V 10ns/DIV 1D-06 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