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| 185MHz CRT Driver CORPORATION CVA3424A / CVA3424 FEATURES DESCRIPTION The CVA3424 Family is a video driver amplifier designed specially to drive high resolution color monitors. With rise and fall time of under 2.5ns and 185MHz bandwidth, this device will provide excellent drive capability for the 2000 x 1600, 1600 x 1280 and 1280 x 1024 monitors. ORDERING INFORMATION Part CVA3424AT CVA3424T Package TO-220 TO-220 Temperature -20oC to +90oC -20oC to +90oC * Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185MHz * Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5ns ...... * Swing .Voltage .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . .40VP-P . 80V * Supply * CRT Driver for 2000 x 1600, 1600 x 1280 and 1280 x 1024 Monitors APPLICATIONS CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC 11 10 9 8 7 6 5 4 3 2 1 Vcc NC Vout GND GND GND NC NC Vin NC NC VCC 11 RF 3.66k Vin 3 RB 142 CVA3424 Vout 9 GND 6,7,8 1B-04 PIN 1 DESIGNATOR T11A 1C-04 CVA3424A / CVA3424 CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +90oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 10pF, Vout = 40Vp-p. See Figure 1. TA = +125oC unless otherwise noted. SYMBOL ICC VinDC VoutDC AV CHARACTERISTICS Supply Current Iput DC Level Output DC Level Voltage Gain Gain Matching 1.4 34 11 MIN TYP 45 1.6 40 13 0.2 MAX 55 1.8 46 15 UNITS mA V V V dB AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 10pF, Vout = 40Vp-p. See Figure 1. TA = +125oC unless otherwise noted. CVA3424A SYMBOL tr tf BW Le OS / US CHARACTERISTICS MIN Rise Time Fall Time Bandwidth Linearity Overshoot / Undershoot TYP 2.2 2.5 185 5 8 MAX 2.9 2.9 MIN TYP 2.5 2.7 150 5 8 MAX 3.5 3.5 ns ns MHz % % CVA3424 UNITS FIGURE 1. TEST CIRCUIT C3 C2 R1 INPUT R4 R2 11 VCC 9 Vout D2 6,7,8 GND 3 CVA3424 Vin R5 D1 C4 C6 VC C 1 R6 L1 OUTPUT CL R1 = 270 R2 = 12k (1 W) R4 = 300k R5 = 15 R6 = 15 C2 = Variable 4 to 150pF Typical 27pF C3 = 46pF C4 = 10 f/160V C6 = 0.01 f/160V C L = 10pF (Including Parasitics) D1 = DS464 D2 = DS464 L1 = 150nH 1B-05 CVA3424A / CVA3424 CORPORATION APPLICATIONS INFORMATION Basic Circuit Configuration The CVA3424 is a transimpedance amplifier with two stage feedback amplifier configurations. Any change in input current will be reflected as change in output voltage swing. A resistor in series with the input will change the CVA3424 into a voltage amplifier. The output is an emitter follower. Because of the complementary circuitry employed, there is no need for load or pull up resistor. An internally bypassed capacitor is included inside the package, however, for low frequencies an electrolytic capacitor is recommended. CVA3424 has an internal feedback resistor of 3.66K. In the absence of any input signal, the Vout DC is set by Vout (DC) = (1 + Output Characteristics The CVA3424 is intended to be used as the final stage of very fast video circuits. The nominal load capacitance is 10pF. Other values can be accommodated since the output stage is an emitter follower and is fairly insensitive to load capacitance. However, a wire connection of some length is unavoidable, that causes objectionable ringing due to a resonant circuit. To avoid this a damping resistor must be used in series with the lead inductance. Also a resistor is necessary to protect the amplifier against arching. A resistor of 30-50 will provide protection but will slow down the response. The lead inductance may be artificially increased by a tenth of a microHenry to obtain desired peak. Any change in inductance will require readjustment of damping resistor, as stated by equation (1). RF ) V (DC) RB in C L R = (1) If an input signal is applied, the gain is set by Vout = ( RF ) Vin Rx The output of CVA3424 is not short circuit proof. Any resistance to V+ or Ground should be >600. Thermal Characteristics When low frequency square waves are amplified, some droop will occur due to a large change in thermal dissipation in the input transistors. To overcome this an R-C series feedback network is suggested with 300k and 46pF values. Under normal operating conditions the CVA3424 will dissipate up to 6W. The maximum allowed case temperature is +90oC. To calculate maximum heatsink thermal resistance use equation (2). Rth = (90 - 50) = 6.7C/W 6W Input and Transfer Characteristics An input current swing of 4.5mA causes the output to change by 25V. A resistor of 270 in series with the input will give a voltage gain of -13. Input pins are internal dc feedback nodes and thus have low impedances. These pins must be fed from a series RC network for high frequency emphasis. FALL TIME RISE TIME BANDWIDTH 0dB GAIN 5dB/DIV VOLTS 8V/DIV VOLTS 8V/DIV 2ns/DIV 2ns/DIV 1 10 MHz 100 CVA3424 CORPORATION 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: 510-651-1076 |
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