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National Semiconductor
National Semiconductor

LM2402T Datasheet

Monolithic Triple 3 ns CRT Driver


LM2402T Datasheet Preview


August 1999
LM2402
Monolithic Triple 3 ns CRT Driver
General Description
The LM2402 is an integrated high voltage CRT driver circuit
designed for use in high resolution color monitor applica-
tions. The IC contains three high input impedance, wide
band amplifiers which directly drive the RGB cathodes of a
CRT. Each channel has its gain internally set to −14 and can
drive CRT capacitive loads as well as resistive loads pre-
sented by other applications, limited only by the package’s
power dissipation.
The IC is packaged in an industry standard 11 lead TO-220
molded plastic power package. See thermal considerations
on page 5.
Features
n Rise/fall times typically 3.0/2.8 ns with 8 pF load at
40 VPP
n Well matched with LM2202 video preamps
n Output swing capability: 50 VPP for VCC = 80V
n 1V to 5V input range
n Stable with 0-20 pF capacitive loads and inductive
peaking networks
n Convenient TO-220 staggered lead package style
n Standard LM240X family pinout which is designed for
easy PCB layout
Applications
n CRT driver for color monitors with display resolutions up
to 1600 x 1200
n Pixel clock frequency up to 200 MHz
Schematic and Connection Diagrams
DS101016-1
FIGURE 1. Simplified Schematic Diagram
(One Channel)
Top View
Order Number LM2402T
DS101016-2
© 1999 National Semiconductor Corporation DS101016
www.national.com
Page 1

Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, VCC
+90V
Bias Voltage, VBB
+16V
Input Voltage, VIN
−0.5V to VBIAS + 0.5V
Storage Temperature Range, TSTG −65˚C to +150˚C
Lead Temperature (Soldering, <10 sec.)
300˚C
ESD Tolerance
Human Body Model
Machine Model
2 kV
250V
Recommended Operating
Conditions (Note 3)
VCC
VBB
VIN
VOUT (VCC = 80V, VBB = 12V)
Case Temperature
+60V to +85V
+8V to +15V
+1V to +5V
+17V to +72V
−20˚C to +100˚C
Do not operate the part without a heat sink.
Electrical Characteristics
(See Figure 2 for Test Circuit)
Unless otherwise noted: VCC = +80V, VBB = +12V, VIN = +3.3 VDC, CL = 8 pF, TC = 60˚C.
Symbol
Parameter
Conditions
Min
LM2402
Typ
Max
Units
ICC
IBB
VOUT
AV
AV
LE
Supply Current
Bias Current
DC Output Voltage
DC Voltage Gain
Gain Matching
Linear Error
Per Channel, No Output Load
All Three Channels
VIN = 1.9V
(Note 4)
(Notes 4, 5)
22 27 32
40 50 60
62 65 68
−12 −14 −16
1.0
3.5
mA
mA
VDC
dB
%
tr Rise Time
tf Fall Time
OS Overshoot
10% to 90%, 40 VPP Output (1 MHz)
10% to 90%, 40 VPP Output (1 MHz)
40 VPP Output (1 MHz)
3.0 ns
2.8 ns
5%
Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation.
Note 2: All voltages are measured with respect to GND, unless otherwise specified.
Note 3: Operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may
change when the device is not operated under the listed test conditions.
Note 4: Calculated value from voltage gain test on each channel.
Note 5: Linearity error is the variation in DC gain from VIN = 1.5V to VIN = 5V.
Note 6: Input from signal generator: tr, tf < 1 ns.
AC Test Circuit
FIGURE 2. Test Circuit (One Channel)
DS101016-3
Figure 2 shows a typical test circuit for evaluation of the
LM2402. This circuit is designed for testing the LM2402 with
a FET probe. When calculating the total load capacitance,
the Tektronix P6201 FET probe with a 100:1 divider is speci-
fied to have 1.5 pF. The total board capacitance should be
6.5 pF.
www.national.com
2
Page 2

Typical Performance Characteristics
DS101016-4
FIGURE 3. VIN vs VOUT
DS101016-5
FIGURE 6. Power Dissipation vs Frequency
DS101016-6
FIGURE 4. Speed vs Temp.
DS101016-7
FIGURE 7. Speed vs Offset
DS101016-8
FIGURE 5. Rise/Fall Time
DS101016-9
FIGURE 8. Bandwidth
3 www.national.com
Page 3
Part Number LM2402T
Manufactur National Semiconductor
Description Monolithic Triple 3 ns CRT Driver
Total Page 11 Pages
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