Triple 85MHz CRT Driver CVA2419TX FEATURES @ Bandwidth ............ 00. c eee eee 85MHz @ Rise/Fall Time. ............ 00002 c ee eee eee <5.0ns @ SWING 20. eee 50 Vp-p @ Supply Voltage... 2.2... eee 80V @ Pin to Pin Compatible with CVA2415, CVA2416, CVA2417, LM2416 and LM2419 APPLICATIONS @ CRT Driver for 1280 x 1024 and 1024 x 768 Color Monitors CORPORATION , DESCRIPTION The CVA2419TX contains three wide bandwidth, large signal amplifiers designed specially to drive high resolution color monitors. This device will provide excellent drive capability for the 1280 x 1024 and 1024 x 768 color monitor. The CVA2419TX is a low cost CRT driver designed to replace discrete solutions. 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. ORDERING INFORMATION Part Package CVA2419TX TIA Temperature -20C to +90C CONNECTION DIAGRAM PIN 1 DESIGNATOR TIA = = V+ a o Vout 3 BIAS 3 (12V) Vins BIAS 2 (12V) Vine GND Vout2 Vout BIAS 1 (12V) Vin 1 pS |@oO | |O [HO IN |o |o =CVA2419TX CORPORATION a ABSOLUTE MAXIMUM RATINGS Supply Voltage. 2... cee ee 85V Operating Temperature ...............0. -20C to +90C Storage Temperature.................. -25C to +100C Lead Temperature ... 0... ee eee +300C DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tease = +25C. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS lec Supply Current @ 1MHz 28 36 mA lec Supply Current @ 50MHz 50 mA Voutbe Output DC Level 45 50 55 Vv Av Voltage Gain 12 15 17 Vv Gain Matching 0.2 dB AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tease = +25C. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS tr Rise Time 45 6.0 ns tt Fall Time 49 6.0 ns BW Bandwidth 85 MHz Le Linearity 6 % Os Overshoot 6 % FIGURE 1. TEST CIRCUIT INPUT o C1 =0.01pF R1 = 7.5K D1 = FDH400 C2 = 1.0nF R2 = 7.5K D2 = FDH400 C3 = 0.1pF R3 = 10.0K L1 = 560nH C4 = 0.47nF R4 = 34 Q1 = 2N5770 C_ = 12pF (Including Parasitics) R5=5.1K C6 = 1.0NF R6 = 180 17-31 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076CVA2419TX APPLICATION INFORMATION The CVA2419TX 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 CVA2419TX features 80V operation and low power dissipation. 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. Thermal Considerations The transfer characteristics of the amplifier are shown in Figure 2. Since this is a class A input stage, power supply current increases as the input signal increases and consequently power dissipation also increases. Average dissipation per stage is 2.5W, increasing to 4.4W at minimum output voltage. The CVA2419TX cannot be used without heat sinking. Figure 2 shows the power dissipated in each channel over the operating voltage range of the device, Typical "average" power dissipation with the device output voltage at one half the supply voltage is 2.5W per channel for a total dissipation of 7.5W package dissipation. Under white screen conditions, i.e.: 20V output, dissipation increases to 5.4W per channel or 16W total. The CVA2419TX case temperature must be maintained below +90C. If the maximum expected ambient temperature is +50C, then a heat sink is needed with thermal resistance equal to or less than: oO Rih = (90 50C) =2 5C/AN CORPORATION a FIGURE 2. CVA2419TX DC Characteristics VOLTAGE POWER OUTPUT VOLTAGE (VOLTS) (SLLVM) NOILVdISSIC HAMOd 0 1 2 3 4 5 6 7 INPUT VOLTAGE The Thermalloy #14754 is one example of a heatsink that meets this requirement. The output of CVA2419TX is not short circuit proof. Any resistance to V* or Ground should be > 6000. 16W FIGURE 3. FALL TIME RISE TIME BANDWIDTH 80V 80V YN 0dB a = \ a = z2 rea re =o or 83 53 LN Xo" 20V 20V Sns/DIV Sns/DIV MHz CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076CORPORATION a TYPICAL APPLICATION A typical application of the CVA2419TX is shown in Figure 4. Used in conjunction with a CVA1203, a complete video channel from monitor input to CRT cathode is shown. In this application, feedback is local to the CVA1203. An alternative CVA2419TX scheme would be feedback from the output of the CVA2419 to the positive clamp inputs of the CVA1203. This would provide slightly better black level control of the system. FIGURE 4. TYPICAL APPLICATION V, | | + J 100nF pe 1 28 [+4 S RED DRIVE 0.1pF sto | 2 97 12V 1000 c4 c3 Veo |~ c Cc: CI 3 26 0.1pF 27.9 aN 4 v VG 10uF 1p 4 3007 Qi Vbias | 1/3 4 25 CVA2419TX OUTPUT VIDEO TO RED 1,68 c1| PS R4 IN 75Q 10KQ (0.1 5000 CASCODE V,, " C, rH |~ 5 24 FL DRIVER R6 5 a v 1OnF CUTOFF GND VV G 300 ADJ. Dc oO | + 6 23 [44 RESTORE VIDEO oxo GREEN DRIVE " we 51a 12V 7 22 Y CVA1203 1008 T c3 L tt A Vee | v yy 40pF 0.1pF 27.9 uy B 4 300* ai Viias * 9 20 * OUTPUT VIDEO 9 | TOGREEN 16,8 ex| PS R4 IN 75Q 10KQ < CASCODE Vn C. [+ 10 19 }++4 DRIVER R6 vy 5 CUTOFF 0.1pF GND V7 ADJ. oy be 11 18 RESTORE 10uF +L 18 nf tb c3 * t t Voc Lt 12 17 c c2 27,9 u Vv vy ai Viias * 13 16 * OUTPUT LL TO BLUE 1,6,8 Ct R5 R4 O.1HF 3900 CASCODE Vi Cc, L 14 15 DRIVER R6 v CUTOFF GND V7 MAX ADJ. pc CONTRAST 2g 1OK2 | RESTORE CONTROL 10KQ 10KQ | BLACK LEVEL MIN Lo Jur (BRIGHTNESS) 10KQ | CONTROL = 0.1pF 16-02 BLACK LEVEL GATE IN C1 C2 | C3 | C4 | CL* | C6 R1 R2 R3 R4 R5 R6 D1 D2 L1 Q1 uF uF uF | uF pF | uF |} KQ | KQ | KQ Q KQ Q nH CVA2419TX| 1.0 1.0] 0.1 | 0.47] 12 10] 75 | 75 110.0] 34 5.4 180 | FDH400 | FDH400 | 500 | 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076