www.fairchildsemi.com
LM348/LM248
Quad Operational Amplifier
Features
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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
Description
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.
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
Input Voltage
Output Short Circuit Duration
Operating Temperature
LM348
LM248
Storage Temperature
Symbol
V
CC
V
I(DIFF)
V
I
-
T
OPR
T
STG
Value
±18
36
±18
Continuous
0 ~ +70
-25 ~ +85
- 65~ +150
Unit
V
V
V
-
°C
°C
2
LM348/LM248
Electrical Characteristics
(V
CC
=15V, V
EE
= -15V, T
A
=25
°C,
unless otherwise specified)
Parameter
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Resistance
Supply Current (all Amplifiers)
Large Signal Voltage Gain
Channel Separation
Common Mode Input
Voltage Range
Small Signal Bandwidth
Phase Margin (Note2)
Slew Rate (Note2)
Output Short Circuit Current
Output Voltage Swing
Common Mode Rejection
Ratio
Power Supply Rejection Ratio
Symbol
V
IO
I
IO
I
BIAS
R
I
I
CC
G
V
CS
V
I(R)
BW
MPH
SR
I
SC
V
O(P-P)
CMRR
PSRR
R
L
≥10KΩ
R
L
≥2KΩ
R
S
≥10KΩ
Note 1
R
S
≥10KΩ
Note 1
R
L
≥2KΩ
Note 1
f = 1KHz to 20KHz
Note 1
G
V
= 1
G
V
= 1
G
V
= 1
-
Note 1
-
-
Conditions
R
S
≤10KΩ
Note 1
Note 1
Note 1
LM248
Min.
-
-
-
-
-
-
0.8
-
25
15
-
±12
-
-
-
-
±12
±10
70
77
Typ. Max. Min.
1
-
4
-
30
-
2.5
2.4
160
-
120
-
1.0
60
0.5
25
±13
±12
90
96
6.0
7.5
50
125
200
500
-
4.5
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0.8
-
25
15
-
±12
-
-
-
-
±12
±10
70
77
LM348
Typ. Max.
1
-
4
-
30
-
2.5
2.4
160
-
120
-
1.0
60
0.5
25
±13
±12
90
96
6.0
7.5
50
100
200
400
-
4.5
-
-
-
-
-
-
-
-
-
-
-
-
Unit
mV
nA
nA
MΩ
mA
V/mV
dB
V
MHz
Degree
V/µs
mA
V
dB
dB
Note :
1. LM348: 0
≤
T
A
≤
+70
°C
, LM248: -25
≤
T
A
≤
+85
°C
2. Guaranteed by design.
3
LM348/LM248
Typical Performance Characteristics
Supply Voltage (V)
Supply Voltage (V)
Figure 1. Supply Current vs Supply voltage
Figure 2. Output Voltage Swing vs Supply voltage
Source Current (mA)
Sink Current (mA)
Figure 3. Output voltage swing vs Source Current (mA)
Figure 4. Output voltage swing vs Sink Current (mA)
Frequency (Hz)
Frequency (Hz)
Figure 5. Output Impedance vs Frequency
Figure 6. Common-mode Rejection Ratio vs Frequency
4
LM348/LM248
Typical Performance Characteristics (continued)
Figure 7. Open Loop Frequency Response
Figure 8. Bode Plot
Figure 9. Large Signal Pulse Response
Figure 10. Small Signal Pulse Response
Figure 11. Undistorted Output Voltage Swing vs Frequency
Figure 12. Inverting Large Signal Pulse Response
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