LF198QML-SP
- Operates from ±5V to ±18V supplies
- Less than 10 μs acquisition time
- TTL, PMOS, CMOS compatible logic input
- 0.5 mV typical hold step at Ch = 0.01 μF
- Low input offset
- 0.002% gain accuracy
- Low output noise in hold mode
- Input characteristics do not change during hold mode
- High supply rejection ratio in sample or hold
- Wide bandwidth
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The LF198 is a monolithic sample-and-hold circuit which utilizes 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 accomplished with a single pin, and does not degrade input offset drift. The wide bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 1010Ω allows high source impedances to be used without degrading accuracy.
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 specifies 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.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | LF198QML Monolithic Sample-and-Hold Circuits 数据表 (Rev. A) | 2013-3-20 | |||
| * | SMD | LF198QML-SP SMD 5962-87608 | 2016-6-21 | |||
| 选择指南 | TI Space Products (Rev. L) | 2026-3-27 | ||||
| 应用简报 | 经 DLA 批准的 QML 产品优化 (Rev. C) | PDF | HTML | 英语版 (Rev.C) | PDF | HTML | 2025-8-18 | |
| 应用手册 | 重离子轨道环境单粒子效应估算 (Rev. B) | PDF | HTML | 英语版 (Rev.B) | PDF | HTML | 2025-7-7 | |
| 更多文献资料 | TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. B) | 2025-2-20 | ||||
| 应用手册 | 单粒子效应置信区间计算 (Rev. A) | PDF | HTML | 英语版 (Rev.A) | PDF | HTML | 2022-12-2 |
设计与开发
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| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| CFP (NAC) | 14 | Ultra Librarian |