TEXAS INSTRUMENTS  LF398N/NOPB  Sample and Hold Amplifier, 1 Amplifier, 1 MHz, 20 µs, 2 mV, DIP, 8 Pins


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Product Overview

The LF398N/NOPB is a monolithic Sample-and-Hold Circuit uses BI-FET technology to obtain ultrahigh DC accuracy with fast acquisition of signal and low droop rate. Operating as unity-gain follower, DC gain accuracy is 0.002% typical and acquisition time is as low as 6µs 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-N to be included inside the feedback loop of 1MHz operational amplifiers without having stability problems. Input impedance of 10¹⁰Ω 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 5mV/minute with a 1µF hold capacitor. The JFETs have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities.
  • Low input offset
  • Low output noise in hold mode
  • Input characteristics do not change during hold mode
  • High supply rejection ratio in sample or hold
  • Wide bandwidth
  • Logic input compatible with TTL, PMOS and CMOS
  • 0.5mV Typical hold step at 0.01µF
  • 0.002% Gain accuracy
  • 500mW Power dissipation
  • ±15V Supply voltage


Device has limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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Product Information

  • No. of Amplifiers 1 Amplifier
  • Bandwidth 1MHz
  • Acquisition Time 20µs
  • Input Offset Voltage 2mV
  • Amplifier Case Style DIP
  • No. of Pins 8Pins
  • Supply Voltage Range ± 5V to ± 18V
  • Settling Time -
  • Operating Temperature Min 0°C
  • Operating Temperature Max 70°C
  • Packaging Each
  • MSL MSL 1 - Unlimited
  • SVHC No SVHC (15-Jun-2015)

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Availability:  1,319

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    More stock available week commencing 6/20/16

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