LF398S
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LF398S

Precision Sample and Hold Amplifier in SO8 Package

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.23
Features
  • Metal Can and Ceramic Package Versions of this part are Obsolete: LF198AH, LF198H, LF398AH, LF398H, LF398J8. The LF398AN8 is Obsolete.
  • 4µs Typical Acquisition Time
  • Guaranteed 0.01% Max. Gain Error
  • 2mV Typ. Offset Voltage
  • 2.5mV Max. Hold Step
  • Very Low Feedthrough 80dB Min.
  • High Input Impedance Under All Conditions
  • Logic Inputs Compatible with All Logic Families
  • SO8 Package
  • For DIP8 Package, see LF398N
Additional Details
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Metal Can and Ceramic Package Versions of this part are Obsolete: LF198AH, LF198H, LF398AH, LF398H, LF398J8. The LF398AN8 is Obsolete.

The LF398 is a precision sample and hold amplifier which uses a combination of bipolar and junction FET transistors to provide precision, high speed, and long hold times. A typical offset voltage of 2mV and gain error of 0.004% allow this sample and hold amplifier to be used in 12-bit systems. Dynamic performance can be optimized by proper selection of the external hold capacitor. Acquisition times can be as low as 4µs for small capacitors while hold step and droop errors can be held below 0.1mV and 30µV/sec respectively when using larger capacitors.

The LF398 is fixed at unity gain with 10Ω input impedance independent of sample/hold mode. The logic inputs are high impedence differential to allow easy interfacing to any logic family without ground loop problems. A separate offset adjust pin can be used to zero the offset voltage in either the sample or hold mode. Additionally, the hold capacitor can be driven with an external signal to provide precision level shifting or "differencing" operation. The device will operate over a wide supply voltage range from ±5V to ±18V with very little change in performance, and key parameters are specified over this full supply range.

Applications

  • 12-Bit Data Acquisition Systems
  • Ramp Generators
  • Analog Switches
  • Staircase Generators
  • Sample and Difference Circuits
Part Models 2
1ku List Price Starting From $2.23

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LF398S8#PBF
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LF398S8#TRPBF
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Product Lifecycle

PCN

Nov 14, 2022

- 22_0254

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)

Nov 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Nov 14, 2022

- 22_0254

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Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)

Nov 11, 2021

- 21_0060

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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