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LF198JAN Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce LF198JAN
Description  LF198JAN Monolithic Sample-and-Hold Circuits
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LF198JAN
www.ti.com
SNOSAJ2A – FEBRUARY 2005 – REVISED MARCH 2013
LF198JAN Monolithic Sample-and-Hold Circuits
Check for Samples: LF198JAN
1
FEATURES
DESCRIPTION
The LF198 is a monolithic sample-and-hold circuit
2
Operates from ±5V to ±18V Supplies
which utilizes BI-FET technology to obtain ultra-high
Less Than 10
μs Acquisition Time
dc accuracy with fast acquisition of signal and low
TTL, PMOS, CMOS Compatible Logic Input
droop rate. Operating as a unity gain follower, dc gain
accuracy is 0.002% typical and acquisition time is as
0.5 mV Typical Hold Step at Ch = 0.01 μF
low as 6
μs to 0.01%. A bipolar input stage is used to
Low Input Offset
achieve low offset voltage and wide bandwidth. Input
0.002% Gain Accuracy
offset adjust is accomplished with a single pin, and
does not degrade input offset drift. The wide
Low Output Noise in Hold Mode
bandwidth allows the LF198 to be included inside the
Input Characteristics Do Not Change During
feedback loop of 1 MHz op amps without having
Hold Mode
stability problems. Input impedance of 1010
Ω allows
High Supply Rejection Ratio in Sample or Hold
high
source
impedances
to
be
used
without
degrading accuracy.
Wide Bandwidth
Space Qualified
P-channel junction FET's are combined with bipolar
Logic Inputs on the LF198 are Fully Differential
devices in the output amplifier to give droop rates as
low as 5 mV/min with a 1
μF hold capacitor. The
with Low Input Current, Allowing Direct
JFET's have much lower noise than MOS devices
Connection to TTL, PMOS, and CMOS.
used in previous designs and do not exhibit high
Differential Threshold is 1.4V. The LF198 will
temperature instabilities. The overall design ensures
Operate from ±5V to ±18V Supplies.
no feed-through from input to output in the hold
mode, even for input signals equal to the supply
voltages.
Connection Diagrams
Figure 1. TO-99 Package
See Package Number LMC
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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