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LF298M Arkusz danych(PDF) 1 Page - Texas Instruments |
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LF298M Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 33 page Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LF198-N, LF298, LF398-N LF198A-N, LF398A-N SNOSBI3B – JULY 2000 – REVISED NOVEMBER 2015 LF298, LFx98x Monolithic Sample-and-Hold Circuits 1 Features 3 Description The LF298 and LFx98x devices are monolithic 1 • Operates from ±5-V to ±18-V Supplies sample-and-hold circuits that use BI-FET technology • Less than 10- μs Acquisition Time to obtain ultrahigh DC accuracy with fast acquisition • Logic Input Compatible With TTL, PMOS, CMOS of signal and low droop rate. Operating as a unity- gain follower, DC gain accuracy is 0.002% typical and • 0.5-mV Typical Hold Step at Ch = 0.01 µF acquisition time is as low as 6 µs to 0.01%. A bipolar • Low Input Offset input stage is used to achieve low offset voltage and • 0.002% Gain Accuracy wide bandwidth. Input offset adjust is accomplished with a single pin and does not degrade input offset • Low Output Noise in Hold Mode drift. The wide bandwidth allows the LF198-N to be • Input Characteristics Do Not Change During Hold included inside the feedback loop of 1-MHz Mode operational amplifiers without having stability • High Supply Rejection Ratio in Sample or Hold problems. Input impedance of 1010 Ω allows high- • Wide Bandwidth source impedances to be used without degrading accuracy. • Space Qualified, JM38510 P-channel junction FETs are combined with bipolar 2 Applications devices in the output amplifier to give droop rates as low as 5 mV/min with a 1-µF hold capacitor. The • Ramp Generators With Variable Reset Level JFETs have much lower noise than MOS devices • Integrators With Programmable Reset Level used in previous designs and do not exhibit high • Synchronous Correlators temperature instabilities. The overall design ensures no feedthrough from input to output in the hold mode, • 2-Channel Switches even for input signals equal to the supply voltages. • DC and AC Zeroing Logic inputs on the LF198-N are fully differential with • Staircase Generators low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is 1.4 V. The LF198-N will operate from ±5-V to ±18-V supplies. An A version is available with tightened electrical specifications. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) SOIC (14) 8.65 mm × 3.91 mm LF298, LFx98x TO-99 (8) 9.08 mm × 9.08 mm PDIP (8) 9.81 mm × 6.35 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Connection Acquisition Time 1 An 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. |
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