LM139J883 National Semiconductor, LM139J883 Datasheet

LM139J883

Manufacturer Part Number

LM139J883

Description

DIP-14

Manufacturer

National Semiconductor

Datasheet

1.LM138KMIL.pdf (22 pages)

Specifications of LM139J883

Date_code

04+

Current page: 1 of 22
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New Op Amp Ideas

Abstract

An op amp and voltage reference capable of single supply

operation down to 1.1V is introduced. Performance is un-

compromised and compares favorably with standard,

state-of-the-art devices. In a departure from conventional

approaches, the circuit can operate in a floating mode, pow-

ered by residual voltages, independent of fixed supplies. A

brief description of the IC design is given, but emphasis is on

applications. Examples are given for a variety of remote

comparators and two-wire transmitters for analog signals.

Regulator designs with outputs ranging from a fraction of a

volt to several hundred volts are discussed. In general,

greater precision is possible than with existing ICs. Designs

for portable instruments are also looked into. These applica-

tions serve to emphasize the flexibility of the new part and

can only be considered a starting point for new designs.

Introduction

Integrated circuit operational amplifiers have reached a cer-

tain maturity in that there no longer seems to be a pressing

demand for better performance. Devices are available at low

cost for all but the most exacting needs. Of course, there is

always room for improvement, but even substantial changes

in specifications cannot be expected to cause much excite-

ment.

A new approach to op amp design and application has been

taken here. First, the amplifier has been equipped to function

in a floating mode, independent of fixed supplies. This, how-

ever, in no way restricts conventional operation. Second, it

has been combined with a voltage reference, since these

two functions are often interlocked in equipment design.

Third, the minimum operating voltage has been reduced to

nearly one volt. It will be seen that these features open broad

new areas of application.

Input Offset Voltage

Offset Voltage Drift

Input Offset Current

Offset Current Drift

Input Bias Current

Bias Current Drift

Common-Mode

Supply-Voltage

Unloaded

Loaded

Rejection

Voltage Gain

Parameter

AN007200

TABLE 1. Typical Performance of the

Operational Amplifier at 25˚C

−55˚C ≤ T

1.2V ≤ V

−

≤ 50 µA

≤ V

Conditions

National Semiconductor

Application Note 211

Robert J. Widlar

Robert C. Dobkin

Mineo Yamatake

December 1978

A functional diagram of the new device is shown in Figure 1.

Even though a voltage reference and a reference amplifier

have been added, it can still be supplied in an eight-pin TO-5

or mini-DIP. The pin connections for the op amp are the

same as the industry standards. And offset balancing that

tends to minimize drift has been provided. Both the op amp

and the reference amplifier are internally compensated for

unity-gain feedback.

Table 1 shows that, except for bias current, the general

specifications are much as good as the popular LM108. But

the new circuit has a common mode range that includes V

and the output swings within 50 mV of the supplies with

50 µA load, or within 0.4V with 20 mA load. These param-

eters are specified in Table 1 as the conditions under which

gain and common-mode rejection are measured. Table 2

indicates that the reference compares favorably with the

better ICs on the market today.

20V,

19.95V,

19.6V,

≤ V

≤ 40V

≤ 125˚C

FIGURE 1. Functional diagram of the new IC

−.85V

400V/mV

130V/mV

40 pA/˚C

2 µV/˚C

0.25 nA

2 pA/˚C

0.3 mV

102 dB

Value

10 nA

96 dB

www.national.com

00720001

−

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