LF198JAN

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SNOSAJ2A – FEBRUARY 2005 – REVISED MARCH 2013

LF198JAN Monolithic Sample-and-Hold Circuits

Check for Samples: LF198JAN

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FEATURES

DESCRIPTION

The LF198 is a monolithic sample-and-hold circuit

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•

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

•

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

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

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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

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