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LF398 - Sample-and-Hold Amplifier

LF398 - Sample-and-Hold Amplifier

LF398 - Sample-and-Hold Amplifier

The LF198/LF298/LF398 are monolithic sample-and-hold circuits which utilize 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 bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 1010[Ohm] 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 with a 1 µF 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.


  • Operates from ±5V to ±18V supplies
  • Less than 10 µs acquisition time
  • TTL, PMOS, CMOS compatible logic input
  • 0.5 mV typical hold step at Ch = 0.01 µF
  • Low input offset
  • 0.002% gain accuracy
  • Low output noise in hold mode
  • Input characteristics do not change during hold mode
  • High supply rejection ratio in sample or hold
  • Wide bandwidth
  • Space qualified, JM38510

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  • Views: 1043
  • Product Code: LF398 - Sample-and-Hold Amplifier
  • Availability: In Stock
  • Rs40.00

Tags: lf398 - sample-and-hold amplifier, lf398, bi fet, opamp, op amp, semiconductor, ic, amplifier, sample, hold, fet, jfet

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