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.

• 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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LF198QML的完整型号有：5962-8760801GA、LF198H/883，以下是这些产品的关键参数及官网采购报价：

5962-8760801GA，工作温度：-55 to 125，封装：TO-99 (LMC)-8，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：Call TI，引脚镀层/焊球材料：Call TI，TI官网5962-8760801GA的批量USD价格：22.48（1000+）

LF198H/883，工作温度：-55 to 125，封装：TO-99 (LMC)-8，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：Call TI，引脚镀层/焊球材料：Call TI，TI官网LF198H/883的批量USD价格：22.48（1000+）

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