Datasheet > JM3851012501SGA

JM3851012501SGA

更新时间： 2024-11-24 12:04:39

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LF198JAN Monolithic Sample-and-Hold Circuits

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JM3851012501SGA 数据手册

LF198JAN

www.ti.com

SNOSAJ2A –FEBRUARY 2005–REVISED MARCH 2013

LF198JAN Monolithic Sample-and-Hold Circuits

Check for Samples: LF198JAN

FEATURES

DESCRIPTION

The LF198 is a monolithic sample-and-hold circuit

which utilizes BI-FET technology to obtain ultra-high

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. The wide

bandwidth allows the LF198 to be included inside the

feedback loop of 1 MHz op amps without having

stability problems. Input impedance of 10¹⁰Ω allows

high source impedances to be used without

degrading accuracy.

•

Operates from ±5V to ±18V Supplies

Less Than 10 μs Acquisition Time

TTL, PMOS, CMOS Compatible Logic Input

0.5 mV Typical Hold Step at C_h= 0.01 μF

Low Input Offset

0.002% Gain Accuracy

Low Output Noise in Hold Mode

Input Characteristics Do Not Change During

Hold Mode

•

High Supply Rejection Ratio in Sample or Hold

Wide Bandwidth

Space Qualified

P-channel junction FET's are combined with bipolar

devices in the output amplifier to give droop rates as

low as 5 mV/min with a 1 μF hold capacitor. The

JFET's have much lower noise than MOS devices

used in previous designs and do not exhibit high

temperature instabilities. The overall design ensures

no feed-through from input to output in the hold

mode, even for input signals equal to the supply

voltages.

Logic Inputs on the LF198 are Fully Differential

with Low Input Current, Allowing Direct

Connection to TTL, PMOS, and CMOS.

Differential Threshold is 1.4V. The LF198 will

Operate from ±5V to ±18V Supplies.

Connection Diagrams

Figure 1. TO-99 Package

See Package Number LMC

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...21

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