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LF298 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LF298
Szczegółowy opis  Monolithic Sample-and-Hold Circuits
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Strona internetowa  http://www.ti.com
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LF198-N, LF298, LF398-N
LF198A-N, LF398A-N
SNOSBI3B – JULY 2000 – REVISED NOVEMBER 2015
LF298, LFx98x Monolithic Sample-and-Hold Circuits
1 Features
3 Description
The LF298 and LFx98x devices are monolithic
1
Operates from ±5-V to ±18-V Supplies
sample-and-hold circuits that use BI-FET technology
Less than 10-
μs Acquisition Time
to obtain ultrahigh DC accuracy with fast acquisition
Logic Input Compatible With TTL, PMOS, CMOS
of signal and low droop rate. Operating as a unity-
gain follower, DC gain accuracy is 0.002% typical and
0.5-mV Typical Hold Step at Ch = 0.01 µF
acquisition time is as low as 6 µs to 0.01%. A bipolar
Low Input Offset
input stage is used to achieve low offset voltage and
0.002% Gain Accuracy
wide bandwidth. Input offset adjust is accomplished
with a single pin and does not degrade input offset
Low Output Noise in Hold Mode
drift. The wide bandwidth allows the LF198-N to be
Input Characteristics Do Not Change During Hold
included
inside
the
feedback
loop
of
1-MHz
Mode
operational
amplifiers
without
having
stability
High Supply Rejection Ratio in Sample or Hold
problems. Input impedance of 1010
Ω allows high-
Wide Bandwidth
source impedances to be used without degrading
accuracy.
Space Qualified, JM38510
P-channel junction FETs are combined with bipolar
2 Applications
devices in the output amplifier to give droop rates as
low as 5 mV/min with a 1-µF hold capacitor. The
Ramp Generators With Variable Reset Level
JFETs have much lower noise than MOS devices
Integrators With Programmable Reset Level
used in previous designs and do not exhibit high
Synchronous Correlators
temperature instabilities. The overall design ensures
no feedthrough from input to output in the hold mode,
2-Channel Switches
even for input signals equal to the supply voltages.
DC and AC Zeroing
Logic inputs on the LF198-N are fully differential with
Staircase Generators
low input current, allowing for direct connection to
TTL, PMOS, and CMOS. Differential threshold is
1.4 V. The LF198-N will operate from ±5-V to ±18-V
supplies.
An A version is available with tightened electrical
specifications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (14)
8.65 mm × 3.91 mm
LF298, LFx98x
TO-99 (8)
9.08 mm × 9.08 mm
PDIP (8)
9.81 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Connection
Acquisition Time
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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