LM149 National Semiconductor, LM149 Datasheet

LM149

Manufacturer Part Number

LM149

Description

Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5)

Manufacturer

National Semiconductor

Datasheet

1.LM149.pdf (18 pages)

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LM148/LM248/LM348

Quad 741 Op Amps

LM149

Wide Band Decompensated (A

General Description

The LM148 series is a true quad 741. It consists of four inde-

pendent, high gain, internally compensated, low power op-

erational amplifiers which have been designed to provide

functional characteristics identical to those of the familiar

741 operational amplifier. In addition the total supply current

for all four amplifiers is comparable to the supply current of a

single 741 type op amp. Other features include input offset

currents and input bias current which are much less than

those of a standard 741. Also, excellent isolation between

amplifiers has been achieved by independently biasing each

amplifier and using layout techniques which minimize ther-

mal coupling. The LM149 series has the same features as

the LM148 plus a gain bandwidth product of 4 MHz at a gain

of 5 or greater.

The LM148 can be used anywhere multiple 741 or 1558 type

amplifiers are being used and in applications where amplifier

matching or high packing density is required.

Schematic Diagram

* 1 pF in the LM149

DS007786

Features

n 741 op amp operating characteristics

n Low supply current drain:

n Class AB output stage — no crossover distortion

n Pin compatible with the LM124

n Low input offset voltage: 1 mV

n Low input offset current: 4 nA

n Low input bias current: 30 nA

n Gain bandwidth product

n High degree of isolation between amplifiers: 120 dB

n Overload protection for inputs and outputs

V (MIN)

LM148 (unity gain): 1.0 MHz

LM149 (A

= 5)

5): 4 MHz

DS007786-1

0.6 mA/Amplifier

www.national.com

May 1999

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