LF351

Wide Bandwidth JFET Input Operational Amplifier

General Description

The LF351 is a low cost high speed JFET input operational

amplifier with an internally trimmed input offset voltage

current and yet maintains a large gain bandwidth product

and a fast slew rate. In addition, well matched high voltage

JFET input devices provide very low input bias and offset

currents. The LF351 is pin compatible with the standard

LM741 and uses the same offset voltage adjustment cir-

cuitry. This feature allows designers to immediately upgrade

the overall performance of existing LM741 designs.

The LF351 may be used in applications such as high speed

integrators, fast D/A converters, sample-and-hold circuits

and many other circuits requiring low input offset voltage,

low input bias current, high input impedance, high slew rate

and wide bandwidth. The device has low noise and offset

voltage drift, but for applications where these requirements

are critical, the LF356 is recommended. If maximum supply

current is important, however, the LF351 is the better choice.

Features

n

Internally trimmed offset voltage:

10 mV

n

Low input bias current:

50 pA

n

Low input noise voltage:

n

Low input noise current:

n

Wide gain bandwidth:

4 MHz

n

High slew rate:

13 V/µs

n

Low supply current:

1.8 mA

n

High input impedance:

10

12

Ω

n

Low total harmonic distortion A

R

n

Low 1/f noise corner:

50 Hz

n

Fast settling time to 0.01%:2 µs

Typical Connection

Simplified Schematic

DS005648-11

DS005648-12

April 1998

© 1998 National Semiconductor Corporation

DS005648

www.national.com

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PrintDate=1998/04/07 PrintTime=13:52:34 38265 ds005648 Rev. No. 3

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