LF198

更新时间： 2024-11-22 22:47:11

品牌	Logo	应用领域
美国国家半导体 - NSC		采样保持电路
页数	文件大小	规格书
13页	523K
描述
Monolithic Sample-and-Hold Circuits

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中文翻译

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技术参数
数据手册

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LF198 技术参数

生命周期：	Obsolete	零件包装代码：	WAFER
包装说明：	DIE,	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.33.00.01	风险等级：	5.65
最长采集时间：	25 µs	放大器类型：	SAMPLE AND HOLD CIRCUIT
JESD-30 代码：	R-XUUC-N8	负供电电压上限：	-18 V
标称负供电电压 (Vsup)：	-15 V	功能数量：	1
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-55 °C	封装主体材料：	UNSPECIFIED
封装代码：	DIE	封装形状：	RECTANGULAR
封装形式：	UNCASED CHIP	认证状态：	Not Qualified
采样并保持/跟踪并保持：	SAMPLE	供电电压上限：	18 V
标称供电电压 (Vsup)：	15 V	表面贴装：	YES
温度等级：	MILITARY	端子形式：	NO LEAD
端子位置：	UPPER	Base Number Matches：	1

LF198 数据手册

July 2000

LF198/LF298/LF398, LF198A/LF398A

Monolithic Sample-and-Hold Circuits

General Description

Features

n Operates from 5V to 18V supplies

n Less than 10 µs acquisition time

n TTL, PMOS, CMOS compatible logic input

n 0.5 mV typical hold step at C_h= 0.01 µF

n Low input offset

The LF198/LF298/LF398 are monolithic sample-and-hold

circuits which utilize BI-FET technology to obtain ultra-high

dc accuracy with fast acquisition of signal and low droop

rate. Operating as a unity gain follower, dc gain accuracy is

0.002% typical and acquisition time is as low as 6 µs to

0.01%. A bipolar input stage is used to achieve low offset

voltage and wide bandwidth. Input offset adjust is accom-

plished with a single pin, and does not degrade input offset

drift. The wide bandwidth allows the LF198 to be included in-

side the feedback loop of 1 MHz op amps without having sta-

bility problems. Input impedance of 10¹⁰Ω allows high

source impedances to be used without degrading accuracy.

n 0.002% gain accuracy

n Low output noise in hold mode

n Input characteristics do not change during hold mode

n High supply rejection ratio in sample or hold

n Wide bandwidth

n Space qualified, JM38510

P-channel junction FET’s are combined with bipolar devices

in the output amplifier to give droop rates as low as 5 mV/min

with a 1 µF hold capacitor. The JFET’s have much lower

noise than MOS devices used in previous designs and do

not exhibit high temperature instabilities. The overall design

guarantees no feed-through from input to output in the hold

mode, even for input signals equal to the supply voltages.

Logic inputs on the LF198 are fully differential with low input

current, allowing direct connection to TTL, PMOS, and

CMOS. Differential threshold is 1.4V. The LF198 will operate

from 5V to 18V supplies.

An “A” version is available with tightened electrical

specifications.

Typical Connection and Performance Curve

Acquisition Time

DS005692-32

DS005692-16

Functional Diagram

DS005692-1

DS005692

www.national.com

12 3 4 5 6 7...13

中文翻译

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与LF198相关器件

型号	品牌	获取价格	描述	数据表
LF198/BGC	ETC	获取价格	Sample/Track-and-Hold Amplifier
LF198A	Linear	获取价格	Precision Sample and Hold Amplifier
LF198A	NSC	获取价格	Monolithic Sample-and-Hold Circuits
LF198A	TI	获取价格	LF198/LF298/LF398, LF198A/LF398A Monolithic Sample-and-Hold Circuits
LF198AH	Linear	获取价格	Precision Sample and Hold Amplifier
LF198AH	NSC	获取价格	Monolithic Sample-and-Hold Circuits
LF198AH/NOPB	TI	获取价格	单片采样保持电路 \| LMC \| 8 \| -55 to 125
LF198AJ8	Linear	获取价格	IC SAMPLE AND HOLD AMPLIFIER, CDIP8, Sample and Hold Circuit
LF198AL	ETC	获取价格	Sample/Track-and-Hold Amplifier
LF198AN8	Linear	获取价格	IC SAMPLE AND HOLD AMPLIFIER, PDIP8, Sample and Hold Circuit

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