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National Semiconductor Electronic Components Datasheet

H2426 Datasheet

Triple 80 MHz CRT Driver

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H2426 pdf
June 1992
LH2426
Triple 80 MHz CRT Driver
General Description
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The LH2426 contains three wide bandwidth large signal
amplifiers designed for large voltage swings at high frequen-
cies The amplifiers work on a transimpedance principal i e
an input current swing of g4 38 mA results in an output
voltage swing of g25V The device is intended for use in
color CRT monitors and is a low cost solution to designs
conforming to the IBM 8514 graphics standard
Features
Y Operation from 80V power supply
Y 80 MHz bandwidth at 50 VPP swings
Y Rise fall time less than 4 ns
Y Output signal can swing 70V
Y Drives CRT directly
Applications
Y CRT driver for RGB monitors
Y High voltage transimpedance amplifiers
Schematic and Connection Diagrams
(One Section)
TL H 10739 – 1
TL H 10739 – 2
Top View
Order Number LH2426S
See NS Package Number HY12B
IBM is a registered trademark of International Business Machines Corporation
C1995 National Semiconductor Corporation TL H 10739
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

H2426 Datasheet

Triple 80 MHz CRT Driver

No Preview Available !

H2426 pdf
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage Va
a85V
Power Dissipation PD
10W
Storage Temperature Range TSTG
Operating Temperature Range TCASE
Lead Temperature (Soldering 10 sec )
ESD Tolerance
b25 C to a100 C
b20 C to a90 C
300 C
TBD
DC Electrical Characteristics Va e 80V R1 e 430X C1 e 82 pF CL e 8 pF 50 VPP output swing with
40V DC offset See Figure 1 TCASE e 25 C unless otherwise noted
Symbol
Parameter
Conditions
LH2426
Units
Min Typical Max
Va Supply Current
(per Amplifier)
No Input or Output Load
24 30 mA
www.DataSheet4U.cVoImNDC
VOUTDC
tR
tF
BW
Input Offset Voltage
Output Offset Voltage
Rise Time
Fall Time
Bandwidth
10% to 90%
90% to 10%
b3 dB
14 16 18 V
34 40 46 V
3 5 5 ns
3 5 5 ns
100 MHz
Av Voltage Gain
11 13 14 V V
OS Overshoot
10 %
LE Linearity Error
VOUT from a10V to a70V
Note 1
5
%
D Av
Gain Matching
Note 2
02
Note 1 Linearity error is defined as The variation in small signal gain from a10V to a70V output with a 100 mVAC 1 MHz input signal
Note 2 Calculated value from voltage gain test on each channel
dB
Typical Performance Characteristics
Typical Test Circuit (One Section)
FIGURE 1 Test Circuit (One Section)
Note 8 pF is total load capacitance It includes all parasitic capacitances
TL H 10739 – 3
Figure 1 shows a typical test circuit for evaluation of the
LH2426 This circuit is designed to allow testing of the
LH2426 in a 50 X environment such as a pulse generator
oscillosope or network analyzer To calibrate pulse genera-
tor set to 2 4 VPP into 50 X
Application Hints
The LH2426 is designed as a triple power amplifier for deliv-
ering red blue and green video signals to a cathode ray
tube (CRT) It can provide 50V output swing and energize a
12 ns pixel The input capacitance of a CRT grid is typically
8 pF
THEORY OF OPERATION
The LH2426 is a two stage amplifier (see schematic on front
page) Both stages are in push pull configuration Q2 is bi-
ased with two resistors Q1 gets its bias through the 5700X
feedback resistor and the input biasing current The bases
of Q1 and Q2 are capacitively coupled and therefore Q2 is
also actively driven
The LH2426 is a transimpedance amplifier an input current
is translated into an output voltage An input current of
about g4 5 mA will provide full output swing of g25V A
resistor in series with the input converts the LH2426 into a
voltage amplifier with 430X the voltage gain becomes
b13
2


Part Number H2426
Description Triple 80 MHz CRT Driver
Maker National Semiconductor
Total Page 4 Pages
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