electronic inductors Essay

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www.fairchildsemi.com

LM348/LM248

Quad Operational Amplifier
Features

Description

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TheLM348/LM248 is a true quad LM741. It consists of four independent, high-gain, internally compensated, low power operational amplifiers which have been designed to provide functional characteristics identical to those of the familiar
LM741 operational amplifier. In addition the total supply current for all four amplifiers is comparable to the supply current of a single LM741 type OP Amp. Other features include input offset currents and input bias current which are much less than those of a standard LM741. Also, excellent isolation between amplifiers has been achieved by independently biasing each amplifier and using layout techniques which minimize thermal coupling.

LM741 OP Amp operating characteristics
Low supply current drain
Class AB output stage no crossover distortion
Pin compatible with the LM324/LM248
Low input offset voltage : 1mV Typ.
Low input offset current : 4nA Typ.
Low input bias current : 30nA Typ.
Gain bandwidth (unity gain): 1.0MHz Typ.
High degree of isolation between amplifiers: 120dB
Overload protection for inputs and outputs

14-DIP

1

14-SOP

1

Internal Block Diagram

Rev. 1.0.1
©2001 Fairchild Semiconductor Corporation

LM348/LM248

Schematic Diagram
(One Section Only)

Absolute Maximum Ratings
Parameter
Supply Voltage
Differential Input Voltage

Symbol

Value

Unit

VCC

±18

V

VI(DIFF)

36

V

Input Voltage

±18

V

-

Continuous

-

Operating Temperature
LM348
LM248

TOPR

0 ~ +70
-25 ~ +85

°C

Storage Temperature

2

VI

Output Short Circuit Duration

TSTG

- 65~ +150

°C

LM348/LM248

Electrical Characteristics
(VCC =15V, VEE= -15V, TA=25 °C, unless otherwise specified)
Parameter

Symbol

Input Offset Voltage

VIO

Input Offset Current

Conditions
RS≤10KΩ

LM248
Min.

LM348

Typ. Max. Min.

Typ. Max.

Note 1

6.0

-

1

6.0

-

-

7.5

-

-

7.5

4

50

-

4

50

-

-

125

-

-

100

-

Note 1

1

-

IIO

-

30

200

-

30

200

-

-

500

-

-

400

Unit mV nA nA Input Bias Current

IBIAS

Input Resistance

RI

-

0.8

2.5

-

0.8

2.5

-

MΩ

Supply Current (all Amplifiers)

ICC

-

-

2.4

4.5

-

2.4

4.5

mA

Large Signal Voltage Gain

GV

25

160

-

25

160

-

15

-

-

15

-

-

Channel Separation

CS

-

120

-

-

120

-

dB

Common Mode Input
Voltage Range

VI(R)

Note 1

±12

-

-

±12

-

-

V

Small Signal Bandwidth

BW

GV = 1

-

1.0

-

-

1.0

-

MHz

MPH

GV = 1

-

60

-

-

60

-

Degree

Slew Rate (Note2)

SR

GV = 1

-

0.5

-

-

0.5

-

V/µs

Output Short Circuit Current

ISC

mA

Phase Margin (Note2)

Note 1

RL≥2KΩ
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