LF398N

monolithic sample-and-hold circuit, DIP, ±18V, Less than 10 μs acquisition time, Low output noise

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Price:: US $0.50~0.90 / piece [Get Latest Price]

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PartNumber:: LF398N

Brand:: National Semiconductor - NS | Pack: DIP | D/C: 09+

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Products Upload time: 2011-07-04

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Part Number:LF398N
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Product Summary

The LF398N is a monolithic sample-and-hold circuit. The LF398N 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 LF398N 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.

Parametrics

LF398N absolute maximum ratings: (1)Supply Voltage: ±18V; (2)Power Dissipation (Package; (3)Limitation): 500 mW; (4)Operating Ambient Temperature Range: 0℃ to +70℃; (5)Storage Temperature Range: -65℃ to +150℃; (6)Input Voltage: Equal to Supply Voltage; (7)Logic To Logic Reference Differential Voltage: +7V, -30V; (8)Output Short Circuit Duration: Indefinite; (9)Hold Capacitor Short Circuit Duration: 10 sec; (10)Lead Temperature: 260℃; (11)Thermal Resistance (θJA) (typicals): 215℃/W; θJC (H package, typical) 20℃/W.

Features

LF398N features: (1)Operates from ±5V to ±18V supplies; (2)Less than 10 μs acquisition time; (3)TTL, PMOS, CMOS compatible logic input; (4)0.5 mV typical hold step at Ch = 0.01 μF; (5)Low input offset; (6)0.002% gain accuracy; (7)Low output noise in hold mode; (8)Input characteristics do not change during hold mode; (9)High supply rejection ratio in sample or hold; (10)Wide bandwidth; (11)Space qualified, JM38510.