LF147/LF347

Wide Bandwidth Quad JFET Input Operational Amplifiers

General Description

The LF147 is a low cost, high speed quad JFET input opera-

tional 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 LF147 is pin compatible with the standard

LM148. This feature allows designers to immediately up-

grade the overall performance of existing LF148 and LM124

designs.

The LF147 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.

Features

n Internally trimmed offset voltage:

5 mV max

n Low input bias current:

50 pA

n Low input noise current:

n Wide gain bandwidth:

4 MHz

n High slew rate:

13 V/µs

n Low supply current:

7.2 mA

n High input impedance:

10

12

Ω

R

n Low 1/f noise corner:

50 Hz

n Fast settling time to 0.01%:2 µs

Simplified Schematic

Connection Diagram

1

DS005647-13

Dual-In-Line Package

DS005647-1

Note 1: Available per SMD #8102306, JM38510/11906.

Top View

Order Number LF147J, LF347M, LF347BN,

LF347N or LF147J/883 (Note 1)

See NS Package Number J14A, M14A or N14A

May 1999

© 1999 National Semiconductor Corporation

DS005647

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