Specification	LF198AH/NOPB

Amplifier Type	Sample and Hold
Current - Input Bias	5 nA
Current - Supply	4.5 mA
Mounting Type	Through Hole
Number of Circuits	1
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-55 °C
Package / Case	TO-99-8 Metal Can
Supplier Device Package	TO-99-8
Voltage - Input Offset	1 mV
Voltage - Supply Span (Max) [Max]	36 V
Voltage - Supply Span (Min) [Min]	10 V

LF198-N Series

Monolithic Sample and Hold Circuit

Part	Voltage - Supply Span (Min) [Min]	Current - Supply	Voltage - Supply Span (Max) [Max]	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Current - Input Bias	Supplier Device Package	Voltage - Input Offset	Package / Case	Amplifier Type	Number of Circuits
Texas Instruments LF198AH/NOPB	10 V	4.5 mA	36 V	Through Hole	-55 °C	125 °C	5 nA	TO-99-8	1 mV	TO-99-8 Metal Can	Sample and Hold	1
Texas Instruments LF198H/NOPB	10 V	4.5 mA	36 V	Through Hole	-55 °C	125 °C	5 nA	TO-99-8	1 mV	TO-99-8 Metal Can	Sample and Hold	1
Texas Instruments LF198H	10 V	4.5 mA	36 V	Through Hole	-55 °C	125 °C	5 nA	TO-99-8	1 mV	TO-99-8 Metal Can	Sample and Hold	1

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Bulk	1	$ 13.90
		10	$ 12.82
		25	$ 12.68
Texas Instruments	OTHER	1	$ 19.33
		100	$ 16.88
		250	$ 13.02
		1000	$ 11.64

Description

General part information

LF198-N Series

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 1010Ω 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.

Documents

Technical documentation and resources

LFx98x Monolithic Sample-and-Hold Circuits datasheet (Rev. C)

Data sheet