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Subject: Re: Please help me out with the Op-Amp LM348

Date: 10/08/00 at 9:11 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Please help me out with the Op-Amp LM348 posted by James MENG on 10/05/00 at 9:55 AM:

Hello, James.

The data sheet for the LM348 can be seen at http://www.national.com/ds/LM/LM148.pdf

The device is a quad op-amp where each of the four op-amps is equivalent to a single 741. The pinout plan is perhaps a bit obscure in the data sheet, but it is as follows:

Pin 1 = The output pin of the first op-amp.
Pin 2 = The inverting input of the first op-amp.
Pin 3 = The non-inverting input of the first op-amp.

Pin 7 = The output pin of the second op-amp.
Pin 6 = The inverting input of the second op-amp.
Pin 5 = The non-inverting input of the second op-amp.

Pin 8 = The output pin of the third op-amp.
Pin 9 = The inverting input of the third op-amp.
Pin 10 = The non-inverting input of the third op-amp.

Pin 14 = The output pin of the fourth op-amp.
Pin 13 = The inverting input of the fourth op-amp.
Pin 12 = The non-inverting input of the fourth op-amp.

All of the standard op-amp circuits (summing amplifiers et al) can be implemented with each of these four, essentially independent op-amps.

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org


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