LF198H/NOPB by Texas Instruments | Sample and Hold | Avnet AMERICAS
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LF198H/NOPB

Texas Instruments

Sample and Hold 1-CH 20us 8-Pin TO-99 Tray

Manufacturer Part #: LF198H/NOPB

Alternate Part #: LF198H/NOPB


legend RoHS Compliant

Descriptions

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Information

The LF198/LF298/LF398 are monolithic sample-and-holdcircuits which utilize BI-FET technology to obtain ultra-highdc accuracy with fast acquisition of signal and low drooprate. Operating as a unity gain follower, dc gain accuracy is0.002% typical and acquisition time is as low as 6 µs to0.01%. A bipolar input stage is used to achieve low offsetvoltage and wide bandwidth. Input offset adjust is accomplishedwith a single pin, and does not degrade input offsetdrift. The wide bandwidth allows the LF198 to be included insidethe feedback loop of 1 MHz op amps without having stabilityproblems. Input impedance of 1010Ω allows highsource impedances to be used without degrading accuracy.P-channel junction FET’s are combined with bipolar devicesin the output amplifier to give droop rates as low as 5 mV/minwith a 1 µF hold capacitor. The JFET’s have much lowernoise than MOS devices used in previous designs and donot exhibit high temperature instabilities. The overall designguarantees no feed-through from input to output in the holdmode, even for input signals equal to the supply voltages.

Key Features

  • 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 Logic inputs on the LF198 are fully differential with low input current, allowing direct connection to TTL, PMOS, and CMOS.Differential threshold is 1.4V. The LF198 will operatefrom ±5V to ±18V supplies. An “A” version is available with tightened electricalspecifications.

Technical Attributes

Description
Value
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Operating Temperature
-55 to 125 °C
Operating Supply Voltage
±15 V
Power Supply Type
Dual
Number of S/H
1
Mounting
Through Hole
Lead Finish
Tin/Silver/Copper

ECCN / UNSPSC

Description
Value
ECCN:
EAR99
SCHEDULE B:
8542390000
HTSN:
8542390001
UNSPSC:
32101600
UNSPSC VERSION:
V15.1101
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USD    $11.59
  • Additional Stock Lead Time: 6 Weeks
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