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National Semiconductor Electronic Components Datasheet

LM2468TA Datasheet

Monolothic Triple 14nS High Gain CRT Driver

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LM2468TA pdf
December 2000
LM2468
Monolothic Triple 14nS High Gain CRT Driver
General Description
The LM2468 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con-
tains three high input impedance wide band amplifiers,
which directly drive the RGB cathodes of a CRT. Each
channel has its gain internally set to -20 and can drive CRT
capacitive loads as well as resistive loads present in other
applications, limited only by the package’s power dissipation.
The IC is packaged in an industry standard 9 lead TO-220
molded plastic package.
Features
n Higher gain to accommodate CMOS preamplifiers
n 0V to 3.75V input range
n Stable with 0-20pF capacitive loads and inductive
peaking networks
n Matched to the LM126X series preamplifier and
LM2479/2480 bias clamp
n Maintains standard LM243X Family Pinout which is
designed for easy PCB layout
n Convenient TO-220 staggered 9 lead package style
Applications
n Up to 1024 X 768 at 60 Hz (or 800 X 600 at 72/75 Hz)
n Pixel clock frequencies up to 50 MHz
n Monitors using video blanking
Schematic Diagram
Connection Diagram
DS200135-1
FIGURE 1. Simplified Schematic Diagram (One
Channel)
Note: Tab is at GND.
DS200135-2
FIGURE 2. Top View
Order Number: LM2468TA
NS package Number: TA09A
© 2000 National Semiconductor Corporation DS200135
www.national.com


National Semiconductor Electronic Components Datasheet

LM2468TA Datasheet

Monolothic Triple 14nS High Gain CRT Driver

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LM2468TA pdf
Absolute Maximum Ratings (Notes 1, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, VCC
Bias Voltage, VBB
Input Voltage, VIN
Storage Temperature Range, TSTG
Lead Temperature (Soldering, <10sec.)
ESD Tolerance, Human Body Model
+90V
+16V
0V to 4.5V
-65˚C to +150˚C
300˚C
2kV
Limits of Operating Ranges (Note 2)
VCC
VBB
VIN
VOUT
Case Temperature
+60V to +85V
+8V to 15V
0V to +3.75V
+15V to +75V
-20˚C to +115˚C
Do not operate the part without a heat sink.
Electrical Characteristics
(See Figure 3 for Test Circuit)
Unless otherwise noted: VCC = +80V, VBB = +12V, CL = 8pF, TC = 50˚C.
DC Tests: VIN = +2.25VDC
AC Tests: Output = 40VPP (25V - 65V) at 1MHz
Symbol
Spec Parameter
Conditions
Min Typ Max Units
ICC Supply Current
Three Channels, No Input Signal,
No Output Load
18 25 mA
IBB
VOUT
AV
AV
LE
Bias Current
DC Output Voltage
DC Voltage Gain
Gain Matching
Linearity Error
All three Channels
14 20 mA
No AC Input Signal, VIN = 1.25V
62
65
68 VDC
No AC Input Signal
-18 -20 -22
Note 4, No AC Input Signal
1.0 dB
Note 4, 5, No AC Input Signal
5%
tR Rise Time
tF Fall Time
OS Overshoot
Note 6, 10% to 90%
Note 6, 90% to 10%
Note 6
14 nS
14 nS
1%
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
the 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 3: All voltages are measured with respect to GND, unless otherwise specified.
Note 4: Calculated value from Voltage Gain test on each channel.
Note 5: Linearity Error is the variation in DC Gain from Vin = 1.0 volts to Vin = 3.5 volts.
Note 6: Input from signal generator: tR, tF < 1nS.
AC Test Circuit
Note 7: 8 pF load includes parasitics and FET probe (if used).
Note 8: The heatsink must be grounded.
Note 9: Compensation Cap is chosen for good correlation to FET probe.
Note 10: Input and output cables should be low loss 50coax, less than 1M long.
FIGURE 3. Test Circuit (One Channel)
www.national.com
2
DS200135-3


Part Number LM2468TA
Description Monolothic Triple 14nS High Gain CRT Driver
Maker National Semiconductor
Total Page 9 Pages
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