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 Low Cost Triple CRT Driver
CORPORATION
CVA2405T
FEATURES DESCRIPTION The CVA2405T contains three high impedance wideband amplifiers, designed specifically to drive a CRT. It features no crossover distortion for excellent gray scale linearity. This device can drive monitors with resolutions of 1280 x 1024 (non-interlaced) with pixel frequency of 160MHz. The part is housed in the industry standard 11-lead TO-220 molded power package. The heat sink is grounded. ORDERING INFORMATION Part CVA2405T Package T11A Temperature -20oC to +100oC
* * * * * * *
Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0ns Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65VP-P Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V Excellent Gray Scale Linearity Consistent EMI Performance
APPLICATIONS CRT driver for up to 69kHz monitors with resolution up to 1280 x 1024. Excellent Gray Scale Linearity
CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC
11 10 9 8 7
VCC 9
VIN 1 VBIAS VIN 2
VIN 3 GND
R4 R1
6 5 4
VCC
VOUT 3 GND
R5
VOUT 1,3,5
3 2 GND 1
VOUT 2
VBIAS
10
R6
R1 R3
VOUT 1
VIN
GND = TAB
TOP VIEW T11A PACKAGE
11,9,8
1P-12
R2
1P-13
TAB = GND
2,4,7
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2405T
CORPORATION
ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16W Storage Temperature . . . . . . . . . . . . . . . . . . . -50oC to +150oC ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000V Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC
DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 2.6V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Icc IB VOUT DC Av CHARACTERISTICS Supply Current, Per Channel Bias Current Output DC Level Voltage Gain Gain Matching 47 -11 MIN TYP 20 40 50 -13 0.5 53 -15 MAX 30 UNITS mA mA V V dB
AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 2.6V, VOUT = 40Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Tr Tf Le Rise Time Fall Time Linearity CHARACTERISTICS MIN TYP 6 6 5 MAX UNITS ns ns %
FIGURE 1. TEST CIRCUIT
VCC
C3 VBIAS
C1 C2 6 10 CVA2405T VIN D1 VOUT 1,3,5 D2
C4
C6
VIDEO 11,9,8 INPUT
2,4,7 GND TAB
TEKTRONIX FET PROBE MODEL 6201 (CAP. 1.5pF)
C1 = 0.01F C2 = 100F C3 = 0.1F
C4 = 100F C6 = 8pF
D1, D2 = FHD400
1P-14
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2405T
CORPORATION
FIGURE 2.
+80V
VBIAS
L CVA2405T 91 R
33
VIDEO
SPARK GAP
1P-15
FIGURE 3.
+80V
VBIAS
CVA2405T VIDEO
1K
L 33 R
C CVA4501 DC BIAS I.C. BIAS V cc
SPARK GAP
1P-16
APPLICATION INFORMATION The CVA2405T is a high voltage triple CRT driver suitiable to drive 69kHz, 1280 x 1024 CRT displays. It features a high impedance input to match any pre-amplifier. The CVA2405T has a true class AB output stage that results in excellent gray scale linearity and consistent EMI performance. As with any high speed amplifier used in CRT display applications, specific precaution should be taken to get the required performance. Power supply should be by pass as close to the device pin as possible. Use 0.01f very near to the device and a large capacitor of 10f or more (preferable 100f) near the device. A 0.1f and 10f should be connected near the Vbias pin (#10). Arc protection is very essential. Fast diodes together with the spark gap will achieve sufficient protection. However, in certain applications depends on the tubes a high value of resistor is required to reduce the current into the CVA2405T during arcing. This will result in less than desireable performance some of which can be restored by using a peaking inductor at the output pin, Figure 2. Another way to achieve this is by using a RC network at the output of the device and use a peaking inductor at the tube, Figure 3. The rise and fall time of the CVA2405T may suffer due to stray capacitances associated with the PC Board and other components. It can be improved by carefully designing the PC Board where the output stage and input stage ground path are seperated. Calogic will assist customers in the layout of
the PC Board that will result in quick EMI passage and better performance. The output peaking should be used only to restore the performance loss due to stray capacitances. Over peaking will cause excessive ringing that will have better results but poor EMI. The DC restore circuit is also important when considering the high frequency performance. Using CVA4501, DC Bias IC, better results can be obtained and high frequency performance can be maximixed. THERMAL CONSIDERATIONS Power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA2405T cannot be used without heat sinking. Figure 4 shows the power dissipated in each channel over the operating voltage range of the device. Under white screen conditions, i.e.: 25V output, dissipation increases to 10.8W total. The CVA2405T case temperature must be maintained below +100oC. If the maximum expected ambient temperature is +50oC, then a heat sink is needed with thermal resistance equal to or less than: Rth = (100 - 50oC) = 4.6oC/W 10.8W
The CVA2405T maximum load is 600 to ground or V+. The output of CVA2405T is not short circuit proof. Any resistance to V+ or Ground should be > 600.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2405T
CORPORATION
FIGURE 4. APPLICATION CIRCUIT
VCC 6 C3 C4
VBIAS C1
R2 10 C2
CVA2405T VIN VIDEO 11,9,8 INPUT 2,4,6 GND TAB R1 = 820 R2 = 22 R3 = 47(1/2W)
D1
L
R3 R1 SPARK GAP
VOUT
1,3,5 C5 D2
DC BIAS
C1 = 0.01F C2 = 100F C3 = 0.1F C4 = 100F C5 = 2.2F C7 = 40 - 120pf
D1, D2 = FHD400 L = 150 - 33nH
1P-17
TYPICAL CHARACTERISTICS
80 70 60
VOUT (V)
VOUT vs VIN
16 14 12
POWER (W)
POWER DISSIPATION vs VCC
V OUT = 25V
10 8 6 4
50 40 30 20 10 0
0
V OUT = VCC = 10V
2 0 1 2 3 4 VIN (V) 5 6 7
1P-18
55
60
65
70 75 VCC (V)
80
85
1P-19
BANDWIDTH
0 5 10 15 20 25 30 1MHz 10MHz 100MHz
1P-20
PULSE RESPONSE
VOLTS (V) 10V/DIV.
5 dB / DIV.
TIME = 20ns/DIV.
1P-21
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025


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