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Part Number: LF398A
Description: The LF198/LF298/LF398 are monolithic sample-and-hold circuits which utilize BI-FET technology to obtai...
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LF398A
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General Description
LF398A 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 accom- plished with a single pin, and does not degrade input offset drift. The wide bandwidth allows the LF198 to be included in- side the feedback loop of 1 MHz op amps without having sta- bility problems. Input impedance of 1010 Ω 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 witha1µF 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 guarantees 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.
An "A" version is available with tightened electrical specifications.
LF398A Maximum Ratings
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales ffice/Distributors for availability and specifications.
Supply Voltage ±18V
Power Dissipation (Package
Limitation) (Note 2) 500 mW
Operating Ambient Temperature Range
LF198/LF198A −55˚C to +125˚C
LF298 −25˚C to +85˚C
LF398/LF398A 0˚C to +70˚C
Hold Capacitor Short
Circuit Duration 10 sec
Lead Temperature (Note 4)
H package (Soldering, 10 sec.) 260˚C
N package (Soldering, 10 sec.) 260˚C
M package:
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C
Thermal Resistance (JA) (typicals)
H package 215˚C/W (Board mount in still air)
85˚C/W (Board mount in
400LF/min air flow)
N package 115˚C/W
M package 106˚C/W
JC (H package, typical) 20˚C/W
Storage Temperature Range −65˚C to +150˚C
Input Voltage Equal to Supply Voltage
Logic To Logic Reference
Differential Voltage (Note 3) +7V, −30V
Output Short Circuit Duration Indefinite
LF398A 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
·Space qualified, JM38510
·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
·Space qualified, JM38510
LF398A
PDF/DataSheet Download
- Datasheet: LF398A
- File Size: 1099705 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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