LF444

Quad Low Power JFET Input Operational Amplifier

General Description

The LF444 quad low power operational amplifier provides

many of the same AC characteristics as the industry stan-

dard LM148 while greatly improving the DC characteristics

of the LM148. The amplifier has the same bandwidth, slew

rate, and gain (10 k

Ω load) as the LM148 and only draws

one fourth the supply current of the LM148. In addition the

well matched high voltage JFET input devices of the LF444

reduce the input bias and offset currents by a factor of

10,000 over the LM148. The LF444 also has a very low

equivalent input noise voltage for a low power amplifier.

The LF444 is pin compatible with the LM148 allowing an im-

mediate 4 times reduction in power drain in many applica-

tions. The LF444 should be used wherever low power dissi-

pation and good electrical characteristics are the major

considerations.

Features

200 µA/Amplifier (max)

n Low input bias current:

50 pA (max)

n High gain bandwidth:

1 MHz

n High slew rate:

1 V/µs

n Low noise voltage for low power

n Low input noise current

n High input impedance:

10

12

Ω

50k (min)

Simplified Schematic

Ordering Information

LF444XYZ

X indicates electrical grade

Y indicates temperature range

“M” for military, “C” for commercial

Z indicates package type “D”, “M” or “N”

Connection Diagram

1/4 Quad

DS009156-1

Dual-In-Line Package

DS009156-2

Top View

Order Number LF444AMD, LF444CM,

LF444ACN, LF444CN or LF444MD/883

See NS Package Number D14E, M14A or N14A

May 1998

© 1999 National Semiconductor Corporation

DS009156

www.national.com