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Número de pieza | LM2476 | |
Descripción | Monolithic Triple Channel 6.5 ns High Gain CRT Driver and Bias Clamp | |
Fabricantes | National Semiconductor | |
Logotipo | ||
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LM2476
Monolithic Triple Channel 6.5 ns High Gain CRT Driver
and Bias Clamp
General Description
The LM2476 is a monolithic triple channel CRT driver and
triple bias clamp for low-cost color monitor applications. The
highly integrated IC contains three wide-band amplifiers for
driving the RGB cathodes of a CRT through external cou-
pling capacitors and three low-band clamp amplifiers for DC
restoration and cutoff adjustment of the video outputs. The
CRT drivers have a high, fixed gain of -27 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 a 19-lead TO-247 molded plastic
package and must be operated with a properly chosen heat
sink. See the Package Mounting and Thermal Consider-
ations sections for more information.
n Convenient TO-247 staggered lead package style
CRT Drivers
n High gain of –27 for up to 60VP-P output swing
n Stable with capacitive loads and inductive peaking
networks
Bias Clamps
n Gain of –17 for up to 60V DC output range
Applications
n 1024 x 768 displays up to 85 Hz refresh rate
n Pixel clock frequencies up to 95 MHz
n Monitors using video blanking
Features
n Well-matched to the LM123X/4X family of preamplifiers
n Operates with VCC = 60V to 90V
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Pinout Diagram and Pin Descriptions
Pin Name Pin Description
IND Driver Input Pins (1, 3, 4)
INC Clamp Input Pins (6, 7, 8)
VBB
VCC
GND*
Bias Voltage Pin (2)
Supply Voltage Pin (14)
Ground Pins (5, 10, 12, 16, 18)
OUTC
Clamp Output Pins (9, 11, 13)
OUTD
Driver Output Pins (15, 17, 19)
*Note: All GND pins should be connected together via low HF impedance
traces on the PCB.
Note: Tab is at GND
20121901
FIGURE 1. Pinout and Connection Diagram
© 2005 National Semiconductor Corporation DS201219
www.national.com
1 page Typical Performance Characteristics (VCC = 85V, VBB = 8V, CL = 8 pF, VOUTD = 40VP-P (35V −
75V), VINC = 2.35V, Test Circuit - Figure 4 unless otherwise specified)
20121904
FIGURE 5. VOUTD vs VIND
20121908
FIGURE 8. Speed vs Offset
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20121917
FIGURE 6. VOUTC vs VINC
20121909
FIGURE 9. Speed vs Load Capacitance
20121906
FIGURE 7. LM2476 Pulse Response
20121905
FIGURE 10. Speed vs Temperature
5 www.national.com
5 Page Application Hints (Continued)
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20121914
FIGURE 16. Trace Routing and Component Placement for Red Channel Output
11 www.national.com
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet LM2476.PDF ] |
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