The LFx98x devices are monolithic sample-and-hold circuits that use BI-FET technology to
obtain ultrahigh 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 LFx98x to be included inside the feedback loop of 1-MHz operational amplifiers
without having stability problems. Input impedance of 1010 Ω allows
high-source impedances to be used without degrading accuracy.
P-channel junction FETs 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 JFETs have much lower noise than MOS
devices used in previous designs and do not exhibit high temperature instabilities. The overall
design ensures no feedthrough from input to output in the hold mode, even for input signals equal
to the supply voltages.
Logic inputs on the LFx98x are fully differential with low input current, allowing for
direct connection to TTL, PMOS, and CMOS. Differential threshold is
1.4 V. The LFx98x will operate from ±5-V to ±18-V supplies.
An A version is available with tightened electrical specifications.
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