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National Semiconductor Electronic Components Datasheet

LM2412T Datasheet

Monolithic Triple 2.8 ns CRT Driver

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LM2412T pdf
December 1999
LM2412
Monolithic Triple 2.8 ns CRT Driver
General Description
The LM2412 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 LM2412 is a low power alternative of
the LM2402
The IC is packaged in an industry standard 11 lead TO-220
molded plastic power package. See thermal considerations
section for heat sinking requirements.
Features
n Rise/fall times typically 2.8 ns with 8 pF load at 40 VPP
n Lower power than LM2402 with the same bandwidth
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 with 85 Hz refresh rate
n Pixel clock frequency up to 200 MHz
Schematic and Connection Diagrams
DS101298-1
FIGURE 1. Simplified Schematic Diagram
(One Channel)
DS101298-2
Top View
Order Number LM2412T
See NS package Number
© 1999 National Semiconductor Corporation DS101298
www.national.com


National Semiconductor Electronic Components Datasheet

LM2412T Datasheet

Monolithic Triple 2.8 ns CRT Driver

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LM2412T pdf
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
0V to 6V
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
Operating Ranges (Note 3)
VCC
VBB
VIN
VOUT (VCC = 80V, VBB = 12V)
Case Temperature
+60V to +85V
+8V to +15V
+1V to +5V
+15V to +75V
−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, no AC input.
Symbol
Parameter
Conditions
LM2412
Min Typ Max
Units
ICC
IBB
VOUT
AV
AV
LE
Supply Current
Bias Current
DC Output Voltage
DC Voltage Gain
Gain Matching
Linearity Error
Per Channel, No Output Load
All Three Channels
VIN = 1.9V
(Note 4)
(Notes 4, 5)
16 21 26 mA
27 42 57 mA
62 65 68
−12 −14 −16
VDC
1.0 dB
3.5 %
tr
Rise Time (Notes 6, 7)
10% to 90%, 40 VPP Output (1 MHz)
tf
Fall Time (Notes 6, 7)
10% to 90%, 40 VPP Output (1 MHz)
OS Overshoot
40 VPP Output (1 MHz)
2.8 3.5
2.8 3.5
5
ns
ns
%
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 = 1.6V to VIN = 5.0V.
Note 6: Input from signal generator: tr, tf < 1 ns.
Note 7: 100% tested in production. These limits are not used to calculate outgoing quality levels.
AC Test Circuit
FIGURE 2. Test Circuit (One Channel)
DS101298-3
Figure 2 shows a typical test circuit for evaluation of the
LM2412. This circuit is designed to allow testing of the
LM2412 in a 50environment without the use of an expen-
sive FET probe. The combined resitors of 4950at the out-
put form a 200:1 voltage divider when connected to a 50
load. The test board supplied by NSC also offers the option
to test theLM2412 with a FET probe. CL is the total capaci-
tance at the LM2412 output, including the board capaci-
tance.
www.national.com
2


Part Number LM2412T
Description Monolithic Triple 2.8 ns CRT Driver
Maker National Semiconductor
Total Page 11 Pages
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