LF398 - Monolithic Sample-and-Hold Circuits

LF398 - Monolithic Sample-and-Hold Circuits

General Description:

The LF198/LF298/LF398 are monolithic sample-and-hold circuits which utilize 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 10¹⁰ Ω allows high source impedances to be used without degrading accuracy.

Features:

• 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 Ch = 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

*Image shown is a representation only.