Datasheet > LM2457

LM2457

更新时间： 2024-09-20 04:20:11

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
14页	829K
描述
Monolithic Triple 7.5nS CRT Driver With Integrated Clamp and G1 Blanking

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LM2457 数据手册

October 2000

LM2457

Monolithic Triple 7.5nS CRT Driver With Integrated

Clamp and G1 Blanking

The output of the G1 driver can also be used to drive a

voltage boost capacitor (22uF). 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 require-

ment for a 120V clamp supply.

General Description

The LM2457 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 an external 1.7 VDC reference.

The IC is packaged in an industry standard 15 lead TO-220

molded plastic power package.

The IC contains three high gain, differential input, 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.

Features

n 7.5ns low power driver

n Three integrated active clamp circuits

n Integrated 120V supply and G1 vertical blank drive

circuit

n Multiplexed signal interface to LM125X OSD Pre-amp

minimizes pin count while increasing functionality

n External System voltage reference

n Convenient TO-220 staggered lead package

Integrated with the driver is a triple video clamp circuit for DC

recovery of each of the AC coupled video outputs. The DC

clamp circuit amplifies the clamp signal that is multiplexed on

the video signal input. The DC clamp amplifiers are high

gain, differential input, high input impedance amplifiers, set-

ting 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 +75.

Recommended Applications

n 1024 x 768 Resolution displays up to 85Hz refresh

n Pixel clock frequencies up to 95MHz

Also integrated within the package is a 43V_p-pvertical blank-

ing driver that is designed to drive the vertical retrace blank-

ing signal to the G1. This is a current limited, low impedance

output capable of driving normal G1 decoupling capaci-

tances via an external resistor.

n Monitor requiring horizontal video blanking

Block Diagram

Package Pinout

DS101379-1

FIGURE 1. LM2457 Block Diagram

DS101379-2

FIGURE 2. LM2457 Package Pinout

Order Number LM2457TA

DS101379

www.national.com

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与LM2457相关器件

型号	品牌	获取价格	描述	数据表
LM2457TA	TI	获取价格	3 CHANNEL, VIDEO AMPLIFIER, PZFM15, TO-220, 15 PIN
LM2457TA	NSC	获取价格	IC 3 CHANNEL, VIDEO AMPLIFIER, PZFM15, TO-220, 15 PIN, Audio/Video Amplifier
LM2459	NSC	获取价格	Monolithic Single Channel 15 MHz DTV CRT Driver
LM2459TE	NSC	获取价格	Monolithic Single Channel 15 MHz DTV CRT Driver
LM2459TE/NOPB	TI	获取价格	1 CHANNEL, VIDEO AMPLIFIER, PZFM7, PLASTIC, TO-220, 7 PIN
LM246	STMICROELECTRONICS	获取价格	PROGRAMMABLE QUAD BIPOLAR OPERATIONAL AMPLIFIERS
LM2460	NSC	获取价格	Monolithic Triple Channel High Swing CRT Driver
LM2460TA	NSC	获取价格	Monolithic Triple Channel High Swing CRT Driver
LM2462	NSC	获取价格	Monolithic Triple 3 ns CRT Driver
LM246-2J	RAYTHEON	获取价格	Operational Amplifier, 4 Func, BIPolar, CDIP16,

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