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LM2453TA Dataheets PDF



Part Number LM2453TA
Manufacturers National Semiconductor
Logo National Semiconductor
Description Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking
Datasheet LM2453TA DatasheetLM2453TA Datasheet (PDF)

LM2453 Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking April 2000 LM2453 Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking General Description The AC2DC driver is an integrated high voltage triple CRT driver circuit designed for use in color monitor applications. The input signal interface to the IC is a multiplexed signal containing both clamp and video signal information, relative to a 1.7 VDC reference. The IC contains three high gain, high inpu.

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LM2453 Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking April 2000 LM2453 Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking General Description The AC2DC driver is an integrated high voltage triple CRT driver circuit designed for use in color monitor applications. The input signal interface to the IC is a multiplexed signal containing both clamp and video signal information, relative to a 1.7 VDC reference. The IC contains three high gain, high input impedance, wide band amplifiers which directly drive the RGB cathodes of a CRT. Each channel has its gain internally set to −52 and can drive CRT capacitive loads as well as resistive loads present in other applications, limited only by the package’s power dissipation. Integrated with the driver is triple clamp circuit for DC recovery of each of the AC coupled outputs. The DC clamp circuit amplifies the clamp signal that is multiplexed on the video signal input. The DC clamp amplifiers are high gain, high input impedance amplifiers, setting a low impedance DC level at the clamp output which can be used to restore the DC level of the cathode drive. Each channel has a gain that is internally set to +73. Also integrated within the package is a 40 VP-P vertical blanking driver that is designed to provide vertical retrace blanking on G1 of the CRT. This is a current limited, low impedance output capable of driving normal G1 decoupling capacitances via an external resistor. The output of the G1 driver can also be used to drive a voltage boost capacitor (22 µF). When connected between the G1 drive output and the 120V supply input pin, a 120V boost supply is achieved which can be used to drive the internal DC clamp circuit, thereby eliminating the requirement for a 120V clamp supply. The IC is packaged in an industry standard 15-lead TO-220 molded plastic power package. Features n n n n n n n Low power dissipation Well matched with LM1253A video pre-amp Three wideband video amplifiers Three integrated active clamp circuits Convenient TO-220 staggered lead package Built in horizontal blanking Integrated 120V supply and G1 vertical blank drive circuit Applications n 1280 x 1024 Resolution displays up to 85 Hz refresh n Pixel clock frequencies up to 135 MHz n Monitors requiring horizontal video blanking Block Diagram Package Pinout DS101302-1 FIGURE 1. LM2453 Block Diagram DS101302-2 FIGURE 2. LM2453 Package Pinout Order Number LM2453TA © 2000 National Semiconductor Corporation DS101302 www.national.com LM2453 Special Features MULTIPLEXED VIDEO SIGNAL INPUT The LM2453 accepts the multiplexed video signal from the LM1253 which contains the video signal and DC clamp level. This multiplexed signal is shown in Figure 3. It was designed to simplify the interface between the pre-amp and CRT Driver. Slightly over 1V of dynamic range is provided for the video and OSD portions of the waveform. The clamp signal control voltage range is approximately 0.9V. The typical numbers for the black and white levels shown correspond to a nominal swing of 40 VP-P (from 25 to 65) at the video outputs of the LM2453. The clamp pulse lower level is used to set the voltage at the clamp outputs of the LM2453. DS101302-3 FIGURE 3. National LM1253 Multiplexed Video Signal www.national.com 2 LM2453 Absolute Maximum Ratings (Notes 1, 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 80V Voltage, VCC1 120V Supply VCC2 Bias Voltage, VBB Input Voltage, VIN VBLANK Input Voltage, VBLANK Storage Temperature Range, TSTG Lead Temperature (Soldering, < 10 sec.) ESD Tolerance, Human Body Model +90V +130V +15V 0V to 4V 0V to VBBV −65˚C to +150˚C 300˚C 2 kV ESD Tolerance, Machine Model 200V Operating Ranges (Note 2) VCC1 VBOOST VBB VIN VREF VBLANK Input Voltage, VBLANK VOUT VCLAMP Case Temperature +60V to +85V VCC1 to +125V 7.0V to +9V 0.8V to +3.5V +1.6V to +1.9V 0V to 5.5V +15V to +78V +55V to +118V −20˚C to 100˚C AC Driver Electrical Characteristics (See Figure 4 for Test Circuit) Unless otherwise noted: VCC = +80V, VBB = +8V, VIN = 2.500 VDC, CL = 8 pF, Output = 40 VPP at 1 MHz, TC = 50˚C, VREF = 1.735V, HEATSINK MUST BE GROUNDED. Symbol ICC IBB IOUTTYP AVTYP IRTYP +OS tFTYP −OS LE Parameter VCC Supply Current VBB Supply Current Typical DC Output Voltage Typical DC Voltage Gain Typical Rise Time Overshoot on Rising Edge Typical Fall Time Overshoot on Falling Edge Linearity Error VIN 2.0 VDC to 3.0 VDC, (Note 4) 90% to 10%, (Note 5) Conditions All 3 Channels, No Output Load All 3 Channels, No Output Load No AC Input Signal, VIN = 2.100 VDC No AC Input Signal 10% to 90%, (Note 5) 62 Min Typ 35 22 66 −52 6.0 5 6.0 6 6 Max 45 35 70 Units mA mA VDC V/V ns % ns % % Note 1: Limits of “Absolute Maximum Ratings” indicate limits below which damage to the device will not occur. Note 2: Limits of “Operating Ratings” indicate required boundar.


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