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Features Applications Description","","LFx98x 是采用 BI-FET 技术的单片采样保持电路器件，用于在快速采集信号与低跌落（droop）率的同时实现超高直流精度。其以单位增益跟随器方式工作，典型直流增益精度为 0.002%，采集时间最低可达 6 µs。双极型输入级用于降低失调电压并提供宽带宽，从而可在 1 MHz 运算放大器反馈环路中集成而不引起稳定性问题。差分逻辑输入与 TTL/PMOS/CMOS 相容，保持模式下实现低噪声与低馈通。",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/lfx98x-monolithic-sample-and-hold-circuits-features-applications-description/563072/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/lfx98x-monolithic-sample-and-hold-circuits-features-applications-description/563072.png","ImageObject",300,407,{"name":92,"@type":93},"MrHarris58","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-14","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"LFx98x 的主要功能特性有哪些？","Question",{"text":112,"@type":113},"LFx98x 支持 ±5-V 到 ±18-V 供电，具有小于 10-µs 的采集时间、低输入失调、低保持步进（典型 0.5 mV，Ch=0.01 µF）、低保持模式输出噪声与宽带宽等特点。","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"LFx98x 适合哪些应用场景？",{"text":117,"@type":113},"文档列出适用场景包括带可变复位电平的斜坡发生器、带可编程复位电平的积分器、同步相关器、双通道开关，以及直流/交流零点校准与阶梯发生器等。",{"name":119,"@type":110,"acceptedAnswer":120},"LFx98x 在保持模式下的输入到输出表现如何？",{"text":121,"@type":113},"保持模式下确保输入到输出无馈通，即使输入信号等于供电电压也能保持该特性。其逻辑输入为全差分结构并支持与 TTL、PMOS、CMOS 直连。","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},563072,1791847131,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},687212988360,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","LFx98x Monolithic Sample-and-Hold Circuits  \n1 Features  \n• Operates from ±5-V to ± 18-V Supplies  \n• Less than 10-μs Acquisition Time  \n• Logic Input Compatible With TTL, PMOS, CMOS  \n• 0.5-mV Typical Hold Step at Ch = 0.01 µF  \n• Low Input Offset  \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  \n2 Applications  \n• Ramp Generators With Variable Reset Level  \n• Integrators With Programmable Reset Level  \n• Synchronous Correlators  \n• 2-Channel Switches  \n• DC and AC Zeroing  \n• Staircase Generators  \nTypical Connection  \n3 Description  \nThe LFx98x devices are monolithic sample-and-hold circuits that use BI-FET technology to obtain ultrahigh 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 accomplished with a single pin and does not degrade input offset drift. The wide bandwidth allows the LFx98x to be included inside the feedback loop of 1-MHz operational amplifiers without having stability problems. Input impedance of 1010 Ω allows high-source impedancesto be used without degrading accuracy.  \nP-channel junction FETs 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 JFETs have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design ensures no feedthrough from input to output in the hold mode, even for input signals equal to the supply voltages. Logic inputs on the LFx98x are fully differential with low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is 1.4 V. The LFx98x will operate from ±5-V to ± 18-V supplies.  \nAn A version is available with tightened electrical specifications.  \nDevice Information(1)  \n\n| PART NUMBER | PACKAGE | BODY SIZE (NOM) |\n| --- | --- | --- |\n| LF298, LF398-N | SOIC (14) | 8.65 mm × 3.91 mm |\n| LFx98x | TO-99 (8) | 9.08 mm × 9.08 mm |\n| LF398-N | PDIP (8) | 9.81 mm × 6.35 mm |\n\n(1) For all available packages, see the orderable addendum atthe end of the data sheet.  \nAcquisition Time  \nAn IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.  \nLF198-N, LF298, LF398-NLF198A-N, LF398A-N  \nSNOSBI3C –JULY 2000–REVISED OCTOBER 2018  \n[www.ti.com](www.ti.com)  \n\n| Table of Contents |  |  |\n| --- | --- | --- |\n| 1 Features .................................................................. 1\u003Cbr>2 Applications ........................................................... 1\u003Cbr>3 Description ............................................................. 1\u003Cbr>4 Revision History..................................................... 2\u003Cbr>5 Pin Configuration and Functions ......................... 3\u003Cbr>6 Specifications......................................................... 4\u003Cbr>6.1 Absolute Maximum Ratings ...................................... 4\u003Cbr>6.2 Recommended Operating Conditions ....................... 4\u003Cbr>6.3 Thermal Information .................................................. 4\u003Cbr>6.4 Electrical Characteristics, LF198-N and LF298 ........ 5\u003Cbr>6.5 Electrical Characteristics, LF198A-N ........................ 6\u003Cbr>6.6 Electrical Characteristics, LF398-N........................... 7\u003Cbr>6.7 Electrical Characteristics, LF398A-N (OBSOLETE) . 8\u003Cbr>6.8 Typical Characteristics .............................................. 9\u003Cbr>7 Parameter Measurement Information ................ 12\u003Cbr>7.1 TTL and CMOS 3 V ≤ V LOGIC (Hi State) ≤ 7 V ....... 12\u003Cbr>7.2 CMOS 7 V ≤ V LOGIC (H","cbCainoCPqEYH5HT","https://ap.wps.com/l/cbCainoCPqEYH5HT","pdf",3343507,41,"English","# 1 Features\n# 2 Applications\n# 3 Description\n# 4 Revision History\n# 5 Pin Configuration and Functions\n# 6 Specifications\n## 6.1 Absolute Maximum Ratings\n## 6.2 Recommended Operating Conditions\n## 6.3 Thermal Information\n## 6.4 Electrical Characteristics, LF198-N and LF298\n## 6.5 Electrical Characteristics, LF198A-N\n## 6.6 Electrical Characteristics, LF398-N\n## 6.7 Electrical Characteristics, LF398A-N (OBSOLETE)\n## 6.8 Typical Characteristics\n# 7 Parameter Measurement Information\n## 7.1 TTL and CMOS 3 V ≤ V LOGIC (Hi State) ≤ 7 V\n## 7.2 CMOS 7 V ≤ V LOGIC (Hi State) ≤ 15 V\n## 7.3 Operational Amplifier Drive\n# 8 Detailed Description\n## 8.1 Overview\n## 8.2 Functional Block Diagram\n## 8.3 Feature Description\n## 8.4 Device Functional Modes\n# 9 Application and Implementation\n## 9.1 Application Information\n## 9.2 Typical Applications\n# 10 Power Supply Recommendations\n# 11 Layout\n## 11.1 Layout Guidelines\n## 11.2 Layout Example\n# 12 Device and Documentation Support\n## 12.1 Device Support\n## 12.2 Related Links\n## 12.3 Community Resources\n## 12.4 Trademarks\n## 12.5 Electrostatic Discharge Caution\n## 12.6 Glossary\n# 13 Mechanical, Packaging, and Orderable Information","[{\"question\":\"LFx98x 的主要功能特性有哪些？\",\"answer\":\"LFx98x 支持 ±5-V 到 ±18-V 供电，具有小于 10-µs 的采集时间、低输入失调、低保持步进（典型 0.5 mV，Ch=0.01 µF）、低保持模式输出噪声与宽带宽等特点。\"},{\"question\":\"LFx98x 适合哪些应用场景？\",\"answer\":\"文档列出适用场景包括带可变复位电平的斜坡发生器、带可编程复位电平的积分器、同步相关器、双通道开关，以及直流/交流零点校准与阶梯发生器等。\"},{\"question\":\"LFx98x 在保持模式下的输入到输出表现如何？\",\"answer\":\"保持模式下确保输入到输出无馈通，即使输入信号等于供电电压也能保持该特性。其逻辑输入为全差分结构并支持与 TTL、PMOS、CMOS 直连。\"}]","LFx98x Monolithic Sample-and-Hold Circuits - Features Applications Description | PDF",1791810463,103]