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LF198JAN Fiches technique(PDF) 1 Page - Texas Instruments |
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LF198JAN Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 21 page LF198JAN www.ti.com SNOSAJ2A – FEBRUARY 2005 – REVISED MARCH 2013 LF198JAN Monolithic Sample-and-Hold Circuits Check for Samples: LF198JAN 1 FEATURES DESCRIPTION The LF198 is a monolithic sample-and-hold circuit 2 • Operates from ±5V to ±18V Supplies which utilizes BI-FET technology to obtain ultra-high • Less Than 10 μs Acquisition Time dc accuracy with fast acquisition of signal and low • TTL, PMOS, CMOS Compatible Logic Input droop rate. Operating as a unity gain follower, dc gain accuracy is 0.002% typical and acquisition time is as • 0.5 mV Typical Hold Step at Ch = 0.01 μF low as 6 μs to 0.01%. A bipolar input stage is used to • Low Input Offset achieve low offset voltage and wide bandwidth. Input • 0.002% Gain Accuracy offset adjust is accomplished with a single pin, and does not degrade input offset drift. The wide • Low Output Noise in Hold Mode bandwidth allows the LF198 to be included inside the • Input Characteristics Do Not Change During feedback loop of 1 MHz op amps without having Hold Mode stability problems. Input impedance of 1010 Ω allows • High Supply Rejection Ratio in Sample or Hold high source impedances to be used without degrading accuracy. • Wide Bandwidth • Space Qualified P-channel junction FET's are combined with bipolar Logic Inputs on the LF198 are Fully Differential devices in the output amplifier to give droop rates as low as 5 mV/min with a 1 μF hold capacitor. The with Low Input Current, Allowing Direct JFET's have much lower noise than MOS devices Connection to TTL, PMOS, and CMOS. used in previous designs and do not exhibit high Differential Threshold is 1.4V. The LF198 will temperature instabilities. The overall design ensures Operate from ±5V to ±18V Supplies. no feed-through from input to output in the hold mode, even for input signals equal to the supply voltages. Connection Diagrams Figure 1. TO-99 Package See Package Number LMC 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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