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LF298-LF298MX NOPB
Monolithic Sample and Hold Circuit
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LF198-N, LF298, LF398-N
LF198A-N, LF398A-NSNOSBI3B –JULY 2000–REVISED NOVEMBER 2015
LF298, LFx98x Monolithic Sample-and-Hold Circuits Features 3 DescriptionThe LF298 and LFx98x devices are monolithic Operates from ±5-Vto ±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 asa unity-
gain follower, DC gain accuracyis 0.002% typical and• 0.5-mV Typical Hold Stepat Ch= 0.01 µF acquisition timeisas lowas6µsto 0.01%.A bipolar• Low Input Offset input stageis usedto achieve low offset voltage and• 0.002% Gain Accuracy wide bandwidth. Input offset adjustis accomplished
witha single pin and does not degrade input offset• Low Output Noisein Hold Mode
drift. The wide bandwidth allows the LF198-Nto be• Input Characteristics Do Not Change During Hold included inside the feedback loop of 1-MHzMode operational amplifiers without having stability• High Supply Rejection Ratioin Sampleor Hold problems. Input impedanceof 1010Ω 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 devicesin the output amplifierto give droop ratesas
low as5 mV/min witha 1-µF hold capacitor. The• Ramp Generators With Variable Reset Level JFETs have much lower noise than MOS devices• Integrators With Programmable Reset Level usedin previous designs and do not exhibit high Synchronous Correlators temperature instabilities. The overall design ensures feedthrough from inputto outputin the hold mode,• 2-Channel Switches even for input signals equalto the supply voltages.• DC and AC Zeroing
Logic inputson the LF198-N are fully differential with• Staircase Generators low input current, allowing for direct connectionto
TTL, PMOS, and CMOS. Differential thresholdis
1.4V. The LF198-N will operate from ±5-Vto ±18-V
supplies.A versionis available with tightened electrical
specifications.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Connection Acquisition Time
