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LF298-MIL Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LF298-MIL
Descripción Electrónicos  Monolithic Sample-and-Hold Circuits
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LF298-MIL Datasheet(HTML) 11 Page - Texas Instruments

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LF298-MIL
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8 Detailed Description
8.1 Overview
The LF298-MIL devices are monolithic sample-and-hold circuits that utilize 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. Input impedance of 1010 Ω allows high-source impedances to be used without
degrading accuracy.
8.2 Functional Block Diagram
8.3 Feature Description
The LF298-MIL OUTPUT tracks the INPUT signal by charging and discharging the hold capacitor. The OUTPUT
can be held at any given time by pulling the LOGIC input low relative to the LOGIC REFERENCE voltage and
resume sampling when LOGIC returns high. Additionally, the OFFSET pin can be used to zero the offset voltage
present at the INPUT.
8.4 Device Functional Modes
The LF298-MIL devices have a sample mode and hold mode controlled by the LOGIC voltage relative to the
LOGIC REFERENCE voltage. The device is in sample mode when the LOGIC input is pulled high relative to the
LOGIC REFERENCE voltage and in hold mode when the LOGIC input is pulled low relative to the LOGIC
REFERENCE. In sample mode, the output is tracking the input signal by charging and discharging the hold
capacitor. Smaller values of hold capacitance will allow the output to track faster signals. In hold mode the input
signal is disconnected from the signal path and the output retains the value on the hold capacitor. Larger values
of capacitance will have a smaller droop rate as shown in Figure 4.


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