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See Technical Specifications

LF398N

Sample and Hold 1-CH 20us 8-Pin PDIP

Manufacturer:

NXP Semiconductor
Mfr.Part #:

LF398N
Datasheet:

LF398N Datasheet (PDF)
Amplifier Type:

Sample and Hold
Number of Circuits:

1
Current - Input Bias:

10 nA
Voltage - Input Offset:

2 mV
EDA/CAD Models:

Request Free CAD Models for LF398N

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LF398N General Description

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. 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. The wide bandwidth allows the LFx98x to be included inside the feedback loop of 1-MHz operational amplifiers without having stability problems. 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. 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 LFx98x are fully differential with low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is1.4 V. The LFx98x will operate from ±5-V to ±18-V supplies.

An A version is available with tightened electrical specifications.

Key Features

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

Application

• Ramp Generators With Variable Reset Level
• Integrators With Programmable Reset Level
• Synchronous Correlators
• 2-Channel Switches
• DC and AC Zeroing
• Staircase Generators

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Series	-
Amplifier Type	Sample and Hold	Number of Circuits	1
Output Type	-	Slew Rate	-
Current - Input Bias	10 nA	Voltage - Input Offset	2 mV
Current - Supply	4.5mA	Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	36 V	Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole	Base Product Number	LF398
Rating	Catalog	Operating temperature range (°C)	0 to 70