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| CRT Driver + DC Bias Amplifier CORPORATION Preliminary Data Sheet CVA1775N FEATURES DESCRIPTION The CVA1775N includes a cascode CRT driver and a DC bias cutoff amplifier. All of the active components are inside the CVA1775N. Only the passive components and protection diodes are needed to drive a CRT tube. The CVA1775N can easily drive 70KHz monitors. With the unique feature of DC bias circuitry the printed circuit board will shrink as EMI performance will be improved. ORDERING INFORMATION Part CVA1775N Package 16-PDIP Temperature 0oC to +110oC * * * * * Little or No Heat Sink Required Ease of Use Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <8ns Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <7ns APPLICATIONS 14", 15", 17" Monitors with 70KHz Scanning Frequency SCHEMATIC, TEST CIRCUIT GND-CUTOFF 2KW 1 16 BIASED-CUTOFF 33KW CUTOFF-GAIN (L) 2 2KW CUTOFF-GAIN (H) 3 33KW IN-CUTOFF 100 W 5 4 15 BIASED-CUTOFF V OUTTO CRT CVA1775N 14 1mF 1M 13 15W 12 10mF .01mF V CC (80V) V OUT(DRIVER) V IN (VIDEO) 33W R GAIN 100W 47W 27pF 47W .010pF 6 11 15W 7 10 R LOAD 1.5K W 8 9 1U-21 VBIAS (12V) CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA1775N CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage (Driver Pin #12) . . . . . . . . . . . . . . . . . . . 100V Supply Voltage (cutoff) . . . . . . . . . . . . . . . . . . . . . . . . . . 250V Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +125oC Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 175oC Operating Temperature (Case) . . . . . . . . . . . . . 0oC to +110oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC CRT DRIVER DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 12pF, VBIAS = 12V, VIN = 2.7V, RL = 1500, TCASE = +25oC. SYMBOL Icc VOUT DC Av (Driver) Supply Current Output DC Level Voltage Gain 44 CHARACTERISTICS MIN TYP 20 50 13 MAX 26 56 15 UNITS mA V V CRT DRIVER AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 12pF, VBIAS = 12V, VIN = 2.7V, RL = 1500, TCASE = +25oC. SYMBOL Tr Tf Le OS Rise Time Fall Time Linearity Overshoot CHARACTERISTICS MIN TYP 7.5 7.5 5 3 MAX 9 9 UNITS ns ns % % BIAS AMPLIFIER DC ELECTRICAL CHARACTERISTICS Supply Voltage = 150V, VB = 12Vsee test circuit. SYMBOL ICC VOUT(LOW) VOUT(HIGH) Gain Gain CHARACTERISTICS Supply Current Output Voltage Output Voltage Voltage Gain Gain Match TYP 5 66 121 13.8 0.5 60 118 12 MIN MAX 5.5 70 126 16 1 UNITS mA V V V/V dB CONDITIONS VIN = 5V VIN = 5V VIN = 1V VOUT /VIN Note 1 Note 1. Calculate from voltage gain of each channel. Note 2: VOUT at VIN = 5V, T = 25oC 100oC CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA1775N CORPORATION APPLICATION INFORMATION The CVA1775N is a high voltage driver and DC bias amplifier suitable for VGA, Super VGA, IBM(R) 8514, 1024 x 768 non-interlaced display applications. The CVA1775N features 80V and low power dissipation. The part is housed in the industry standard 16-pin PDIP. Thermal Considerations The transfer characteristics of the CVA1775N application are shown in Figure 1. Since this is a class A input stage, power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA1775N can be used without a heat sink. Under white screen condition, i.e. 25V output, dissipation is 0.6W/channel. Under gray level conditions CL =12pf, VOUT = 45P-P, the dissipation is 1.1W/channel. The output of CVA1775N is not short circuit proof. FIGURE 1. CVA1775N DC CHARACTERISTICS 80 70 60 50 40 0.8 30 20 10 0 0 0.2 0.5 0.7 1.0 1.2 1.5 1.7 2.0 2.2 2.5 2.7 3.0 3.2 3.5 3.7 4.0 4.2 4.5 4.7 5.0 5.2 5.5 5.7 6.0 2 1.8 1.6 1.4 1.2 1.0 V OUT (VOLTS) 0.6 0.4 0.2 0 -0.2 V IN (VOLTS) V OUT Q3-POWER POWER/OUTPUT STAGE 1T-25 TYPICAL CHARACTERISTICS RISE TIME 7.25V 7.25V FALL TIME -2.75V 20ns/DIV 1S-49 -2.75V 20ns/DIV 1S-50 CROSS HATCH WHITE BACKGROUND 8.25V 8.25V 10V/DIV 10V/DIV CROSS HATCH BLACK BACKGROUND 10V/DIV -2.75V 20ns/DIV 1T-01 -1.75V 20ns/DIV 1T-02 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 10V/DIV |
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