CALOGIC CVA1775N

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