NSC LM2406 Datasheet

LM2406
Monolithic Triple 9 ns CRT Driver

LM2406 Monolithic 9 ns Triple CRT Driver

June 1995

General Description

The LM2406 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con­tains 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

b

14.5 and can drive CRT
capacitive loads as well as resistive loads presented 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 4.

Schematic and Connection Diagrams

Features

Y

Output swing capability: 50 VPPfor V

Y

Pinout designed for easy PCB layout

Y

1V to 7V input range

Y

Stable with 0 pF –20 pF capacitive loads

Y

Convenient TO-220 staggered lead style package

40 V
30 V

PP
PP

for V
for V

CC
CC
CC

e

80

e

70

e

60

Applications

Y

CRT driver for 1024 x 768 (Non-interlaced) and SVGA
display resolution color monitors

Y

Pixel clock frequency up to 80 MHz

Note: Tab is at GND

TL/H/12327– 2

Top View

FIGURE 1. Simplified Schematic Diagram (One Channel)

TL/H/12327– 1

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/H/12327

Absolute Maximum Ratings (Notes 1, 3)

a

BIAS

95V

a

16V

a

0.5V

Supply Voltage, V

Bias Voltage, V

Input Voltage, V

Storage Temperature Range, T

BIAS

IN

CC

STG

b

0.5V to V

b

65§Ctoa150§C

Lead Temperature (Soldering,k10 sec.) 300§C

ESD Tolerance 2 kV

Operating Range (Note 2)

V

CC

V

BIAS

V

IN

Case Temperature, T

Do not operate the part without a heat sink

CASE

a

60V toa85V

a

8V toa15V

a

1V toa7V

b

20§Ctoa100§C

Electrical Characteristics

Unless otherwise noted: V

CC

ea

80V, V

Symbol Parameter Conditions

I

V

t

t

A

CC

OUT

R

F

V

Supply Current (Per Channel) No Output Load 18 30 mA

Output Voltage No Input Signal 45 50 55 V

Rise Time 10%–90%, fe1 MHz 9 nS

Fall Time 90%–10%, fe1 MHz 9 nS

Voltage Gain

LE Linearity Error (Note 4) 8 %

DA

V

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: Linearity Error is defined as the variation in small signal gain from

Note 5: Calculated value from Voltage Gain test on each channel.

Note 6: Input signal, V

Gain Matching (Note 5) 1.0 dB

k

2 nS.

IN:tr,tf

BIAS

ea

12V, V

IN

ea

3.3V, C

e

8 pF, Outpute40 VPPat 1 MHz, T

L

Min Typical Max

b

13

a

30V toa70V output with a 100 mV AC, 10 kHz input signal.

LM2406

b

14.5

e

A

b

16 V/V

25§C.

Units

DC

AC Test Circuit

Note: 8 pF is total load including parasitic capacitance.

TL/H/12327– 3

FIGURE 2. Test Circuit (One Channel)

Figure 2

shows a typical test circuit for evaluation of the LM2406. This circuit is designed to allow testing of the LM2406 in a 50X
environment, such as a pulse generator, oscilloscope or network analyzer. The two series resistors at the output form a 100:1
voltage divider when connected to a 50X load.

2