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LF198JAN Arkusz danych(PDF) 2 Page - Texas Instruments |
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LF198JAN Arkusz danych(HTML) 2 Page - Texas Instruments |
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2 / 19 page  LF198JAN Monolithic Sample-and-Hold Circuits General Description 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 band- width allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 10 10 Ω 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 witha1µF 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. 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 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 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. Ordering Information NSC Part Number JAN Part Number NSC Package Number Package Description JL198BGA JM38510/12501BGA H08C 8LD Metal Can JL198SGA JM38510/12501SGA H08C 8LD Metal Can Connection Diagrams Metal Can Package 20128114 See NS Package Number H08C February 2005 © 2005 National Semiconductor Corporation DS201281 www.national.com |
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