NSC LM2427T Datasheet

LM2427
Triple 80 MHz CRT Driver

LM2427 Triple 80 MHz CRT Driver

April 1995

General Description

The LM2427 is a high performance triple CRT driver for
simplifying color monitor designs. The device contains three
large signal transimpedance amplifiers, and provides direct
cathode drive capability. A plastic power package and pin­to-pin compatibility make the LM2427 ideal for new designs
or as a low cost replacement for designs using the LH2426
or CR5527.

Schematic and Connection Diagrams

(One Section)

Features

Y

Low-cost plastic power package

Y

Typical rise/fall times of 3.5 ns

Y

80 MHz video bandwidth at 50 VPPwith 8 pF load

Y

Operation from 80V power supply

Applications

Y

CRT driver for color monitors

Y

Drives CRT cathode directly

Y

Pin-to-pin compatible with the LH2426 and CR5527
CRT drivers

Top View

Order Number LM2427T

See NS Package Number MKT-TA12A

TL/H/11967– 1

C

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

TL/H/11967

TL/H/11967– 2

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage, V

Safe Operating Power Consumption 14W

aa

85V

CASE

b

25§Ctoa100§C

b

20§Ctoa90§C

Storage Temperature Range, T

Operating Temperature Range, T

STG

Lead Temperature (Soldering, 10 sec.) 300§C

ESD Tolerance TBD

Electrical Characteristics V

offset. See

Figure 1.

T

e

25§C unless otherwise noted.

CASE

ae

80V, R

e

430X,C1e47 pF, C

G

Symbol Parameter Conditions

I

CC

V

INDC

V

OUTDC

t

R

t

F

A

V

LE Linearity Error V

DA

V

Note 1: Input signal: tr,t

Note 2: Linearity error is defined as: The variation in small signal gain from

Note 3: Calculated value from voltage gain test on each channel.

Supply Current (per Amplifier) No Input or Output Load 24 30 mA

Input Offset Voltage 1.4 1.6 1.8 V

Output Offset Voltage 34 40 46 V

Rise Time 10% to 90% (Note 1) 3.5 ns

Fall Time 90% to 10% (Note 1) 3.5 ns

Voltage Gain

froma10V toa70V (Note 2) 5 %

OUT

Gain Matching (Note 3) 0.2 dB

k

f

1.5 ns, f

e

1 MHz.

in

a

20V toa70V output with a 100 mVAC, 1 MHz, input signal.

Typical Performance Characteristics

Typical Test Circuit (One Section)

e

8 pF, 50 VPPoutput swing with 40V DC

L

LM2427

Min Typical Max

b

b

11

b

13

14 V/V

Units

Note: CL, total load capacltance, includes all parasitic capacitances.

FIGURE 1. Test Circuit (One Section)

This test circuit is used for both characteristic plots.

Typical Rise Time vs Capacitive Loading

TL/H/11967– 10

TL/H/11967– 3

Typical Fall Time vs Capacitive Loading

TL/H/11967– 5

2