Texas Instruments LF198QML
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. The wide bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems.| Part No. | LF198QML |
|---|---|
| Datasheet | LF198QML Download |
| Manufacturer |  Texas Instruments |
| Description | Monolithic Sample-and-Hold Circuit |
| Buy | Stock & Price |
FEATURES
1●2 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
DESCRIPTION
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. Input impedance of 1010Ω allows high source impedances to be used without degrading accuracy. 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.
