Texas Instruments LF198A-N
The LFx98x devices are monolithic sample-and-hold circuits that use BI-FET technology to obtain ultrahigh DC accuracy with fast acquisition of signal and low droop rate. The wide bandwidth allows the LFx98x to be included inside the feedback loop of 1-MHz operational amplifiers without having stability problems.| Part No. | LF198A-N |
|---|---|
| Datasheet | LF198A-N Download |
| Manufacturer |  Texas Instruments |
| Description | Monolithic Sample-and-Hold Circuit |
| Buy | Stock & Price |
FEATURES
●1 Operates from ±5-V to ±18-V Supplies● Less than 10-μs Acquisition Time
● Logic Input Compatible With TTL, PMOS, CMOS
● 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
● Space Qualified, JM38510 2
APPLICATIONS
● Ramp Generators With Variable Reset Level● Integrators With Programmable Reset Level
● Synchronous Correlators
● 2-Channel Switches
● DC and AC Zeroing
● Staircase Generators 3
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 1010 Ω allows high-source impedances to be used without degrading accuracy. P-channel junction FETs 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.
