CRT Driver + DC Bias Amplifier CORPORATION Preliminary Data Sheet CVA1775N DESCRIPTION FEATURES • • • • Little or No Heat Sink Required Ease of Use Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <8ns Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <7ns APPLICATIONS • 14", 15", 17" Monitors with 70KHz Scanning Frequency 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 Package Temperature CVA1775N 16-PDIP 0oC to +110oC SCHEMATIC, TEST CIRCUIT GND-CUTOFF 1 16 BIASED-CUTOFF 33K W 2K W CUTOFF-GAIN (L) 2 BIASED-CUTOFF 15 2K W V OUTTO CRT CUTOFF-GAIN (H) 3 CVA1775N 14 1 mF 33K W IN-CUTOFF 4 13 15 W 100 W 5 12 6 11 7 10 8 9 10 mF V IN (VIDEO) 100 W 47 W 27pF .01 mF V OUT(DRIVER) V CC (80V) 15 W 33 W R GAIN 1M 1.5K W R LOAD 47 W .010pF 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 = 1500Ω, TCASE = +25oC. SYMBOL CHARACTERISTICS Icc Supply Current VOUT DC Output DC Level Av (Driver) Voltage Gain MIN TYP MAX UNITS 20 26 mA 50 56 V 13 15 V 44 CRT DRIVER AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 12pF, VBIAS = 12V, VIN = 2.7V, RL = 1500Ω, TCASE = +25oC. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS Tr Rise Time 7.5 9 ns Tf Fall Time 7.5 9 ns Le Linearity 5 % OS Overshoot 3 % BIAS AMPLIFIER DC ELECTRICAL CHARACTERISTICS Supply Voltage = 150V, VB = 12Vsee test circuit. SYMBOL CHARACTERISTICS TYP MIN MAX UNITS CONDITIONS 5.5 mA VIN = 5V ICC Supply Current 5 VOUT(LOW) Output Voltage 66 60 70 V VIN = 5V VOUT(HIGH) Output Voltage 121 118 126 V VIN = 1V Gain Voltage Gain 13.8 12 16 V/V ∆VOUT /∆VIN ∆ Gain Gain Match 0.5 1 dB 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 FIGURE 1. CVA1775N DC CHARACTERISTICS The CVA1775N is a high voltage driver and DC bias amplifier suitable for VGA, Super VGA, IBM® 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. 80 2 1.8 70 1.6 60 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. V OUT (VOLTS) Thermal Considerations 1.4 1.2 50 1.0 40 0.8 30 0.6 0.4 20 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. 0.2 10 0 -0.2 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 0 The output of CVA1775N is not short circuit proof. V IN (VOLTS) V OUT Q3-POWER POWER/OUTPUT STAGE 1T-25 TYPICAL CHARACTERISTICS RISE TIME FALL TIME 7.25V 10V/DIV 10V/DIV 7.25V -2.75V -2.75V 20ns/DIV 20ns/DIV 1S-49 CROSS HATCH WHITE BACKGROUND 1S-50 CROSS HATCH BLACK BACKGROUND 8.25V 10V/DIV 10V/DIV 8.25V -1.75V -2.75V 20ns/DIV 1T-01 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