LF398 IC - Sample and Hold Amplifier [Original]

LF398 IC: High-Accuracy Sample and Hold Amplifier

The LF398 is a monolithic sample-and-hold circuit engineered with advanced BI-FET technology. It delivers ultrahigh DC accuracy and rapid signal acquisition, coupled with an exceptionally low droop rate. Operating as a unity-gain follower, it achieves a remarkable 0.002% typical DC gain accuracy and acquisition times as fast as 6 µs to 0.01%. A bipolar input stage ensures low offset voltage and wide bandwidth, allowing seamless integration within 1-MHz operational amplifier feedback loops. With an input impedance of 10^10 Ω, it supports high-source impedances without compromising accuracy. P-channel JFETs in the output amplifier contribute to droop rates as low as 5 mV/min with a 1-µF hold capacitor, offering superior noise performance over MOS designs. The LF398 guarantees no feedthrough from input to output in hold mode, even with supply-level input signals. Its fully differential logic inputs are compatible with TTL, PMOS, and CMOS, operating efficiently from ±5-V to ±18-V supplies.

Specifications:

• Supply Voltage: ±18 V (Max)
• Power Dissipation: 500 mW
• Input Voltage: ±18 V (Max)
• Logic-to-Logic Reference Differential Voltage: 7-30 V
• Output Short Circuit Duration: Indefinite
• Hold Capacitor Short Circuit Duration: 10 sec
• Operating Temperature Range: -65 to 150 °C

Key features and benefits:

• Ultrahigh 0.002% DC Gain Accuracy
• Fast Acquisition Time: Less than 10 µs
• Wide Operating Supply Range: ±5V to ±18V
• Logic Input Compatibility with TTL, PMOS, and CMOS
• Low Droop Rate with P-channel JFETs
• Low Input Offset Voltage
• Wide Bandwidth for stable operation with 1-MHz op-amps
• No Input-to-Output Feedthrough in Hold Mode

Applications:

• High-Speed Data Acquisition Systems
• Analog-to-Digital Converter (ADC) Front Ends
• Precision Signal Processing and Conditioning
• Multiplexed Data Systems
• Peak Detection and Measurement Circuits

Package Includes:

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