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National Semiconductor Electronic Components Datasheet

LM2408 Datasheet

Monolithic Triple 4.5 ns CRT Driver

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LM2408 pdf
December 1996
LM2408
Monolithic Triple 4 5 ns CRT Driver
General Description
The LM2408 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 The gain of
each channel is internally set at b15 and can drive CRT
capacitive loads as well as resistive loads presented by oth-
er applications limited only by the package’s power dissipa-
tion
The IC is packaged in an industry standard 11-Lead TO-220
molded plastic power package See thermal considerations
on page 5
Features
Y Rise fall times typically 4 5 ns with 8 pF load
Y Output swing capability 50 VPP for VCC e 80
40 VPP for VCC e 70
30 VPP for VCC e 60
Y Pinout designed for easy PCB layout
Y 1V to 7V input range
Y Stable with 0 pF – 20 pF capactive loads
Y Convenient TO-220 staggered lead package style
Applications
Y CRT driver for 1280 c 1024 (Non-interfaced) and XGA
display resolution color monitors
Y Pixel clock frequency up to 160 MHz
Schematic and Connection Diagrams
TL H 12683 – 2
Note Tab is at GND
Top View
TL H 12683 – 1
FIGURE 1 Simplified Schematic Diagram (One Channel)
C1996 National Semiconductor Corporation TL H 12683
RRD-B30M126 Printed in U S A
http www national com


National Semiconductor Electronic Components Datasheet

LM2408 Datasheet

Monolithic Triple 4.5 ns CRT Driver

No Preview Available !

LM2408 pdf
Absolute Maximum Ratings
(Notes 1 and 3)
Supply Voltage (VCC)
a95V
Bias Voltage (VBB)
a16V
Input Voltage (VIN)
b0 5V to VBIAS a 0 5V
Storage Temperature Range (TSTG)
b65 C to a150 C
Lead Temperature (Soldering k10 sec )
300 C
ESD Tolerance
2 kV
Operating Ranges (Note 2)
VCC a60V to a85V
VBB a8V to a15V
VIN a1V to a7V
Case Temperature (TCASE)
b20 C to a100 C
Do not operate the part without a heat sink
Electrical Characteristics
Unless otherwise noted VCC e a80V VBB e a12V VIN e a3 2V (at LM2408 input pins) CL e 8 pF Output e 40 VPP at
1 MHz TA e 25 C
Symbol
Parameter
Conditions
LM2408
Units
Min
Typical
Max
ICC
IBB
VOUT
AV
DAV
LE
Supply Current
Bias Current
DC Output Voltage
DC Voltage Gain
Gain Matching
Linearity Error
Per Channel No Output Load
No Input Signal
No Input Signal
(Note 4)
(Notes 4 5)
47
b13
22
21
50
b15
10
8
30
53
b17
mA
mA
VDC
dB
%
tR Rise Time
10% to 90% f e 1 MHz
4 5 ns
tF Fall Time
90% to 10% f e 1 MHz
4 5 ns
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
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 defined as the variation in DC gain from VIN e a 1 90V to VIN e a4 50V
Note 6 Input from signal generator tR tF k 1 ns
AC Test Circuit
Note 8 pF is total load plus parasitic capacitance
Note Adjust Vtest for a3 2V DC at LM2408 input pins
FIGURE 2 Test Circuit (One Channel)
TL H 12683 – 3
Figure 2 shows a typical test circuit for evaluation of the
LM2408 This circuit is designed to allow testing of the
LM2408 in a 50X environment such as a pulse generator
oscilloscope or network analyzer The 4950X resistor at the
output forms a 100 1 voltage divider when connected to a
50X load
http www national com
2


Part Number LM2408
Description Monolithic Triple 4.5 ns CRT Driver
Maker National Semiconductor
Total Page 8 Pages
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