LF398M

Semiconductors - ICs

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> Sample & Hold Amplifiers

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Series Information for LF398M - Texas Instruments

Features

  • feature
    0.002% Gain Accuracy
  • feature
    0.5-mV Typical Hold Step at Ch = 0.01 u00b5F
  • feature
    High Supply Rejection Ratio in Sample or Hold
  • feature
    Input Characteristics Do Not Change During Hold Mode
  • feature
    Less than 10-u03bcs Acquisition Time
  • feature
    Logic Input Compatible With TTL, PMOS, CMOS
  • feature
    Low Input Offset
  • feature
    Low Output Noise in Hold Mode
  • feature
    Operates from u00b15-V to u00b118-V Supplies
  • feature
    Space Qualified, JM38510
  • feature
    Wide Bandwidth

Description

AMP MONO SAMPLE & HOLD 14SOIC
The LF298 and 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. Operating as a unitygain 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-N to be included inside the feedback loop of 1-MHz operational amplifiers without having stability problems. Input impedance of 1010 Ω allows highsource 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. The JFETs have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design ensures no feedthrough from input to output in the hold mode, even for input signals equal to the supply voltages. Logic inputs on the LF198-N are fully differential with low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is 1.4 V. The LF198-N will operate from ±5-V to ±18-V supplies. An A version is available with tightened electrical specifications.

Specifications

No. of Amplifiers:
1Amplifiers
Bandwidth:
1MHz
Acquisition Time:
20µs
Input Offset Voltage:
2mV
Amplifier Case Style:
SOIC
No. of Pins:
14Pins
Supply Voltage Range:
± 5V to ± 18V
Settling Time:
-
Operating Temperature Min:
0°C
Operating Temperature Max:
70°C
Product Range:
-
RoHS Phthalates Compliant:
Yes
MSL:
MSL 1 - Unlimited
SVHC:
No SVHC (27-Jun-2018)
Amplifer Supply Voltage:
± 5V to ± 18V
Base Number:
398
Operating Temperature Range:
0°C to +70°C