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LM725 Operational Amplifier
December 1994
LM725 Operational Amplifier
General Description
The LM725/LM725A/LM725C are operational amplifiers
featuring superior performance in applications where low
noise, low drift, and accurate closed-loop gain are required.
With high common mode rejection and offset null capability,
it is especially suited for low level instrumentation applica-
tions over a wide supply voltage range.
The LM725A has tightened electrical performance with
higher input accuracy and like the LM725, is guaranteed
over a b 55 § Cto a 125 § C temperature range. The LM725C
has slightly relaxed specifications and has its performance
guaranteed over a 0 § Cto70 § C temperature range.
Features
Y High open loop gain
3,000,000
Y Low input voltage drift
0.6 m V/ § C
Y High common mode rejection
120 dB
Y Low input noise current
0.15 pA/
0
Hz
Y Low input offset current
2 nA
Y High input voltage range
g 14V
Y Wide power supply range
g 3V to g 22V
Y Offset null capability
Y Output short circuit protection
Connection Diagrams and Ordering Information
Metal Can Package
Dual-In-Line Package
TL/H/10474±2
Order Number LM725CN
See NS Package Number N08E
TL/H/10474±1
Order Number LM725H/883, LM725CH
or LM725AH/883
See NS Package Number H08C
C 1995 National Semiconductor Corporation
TL/H/10474
RRD-B30M115/Printed in U. S. A.
90960204.003.png
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
Storage Temperature Range
b 65 § Cto a 150 § C
Lead Temperature (Soldering, 10 Sec.)
260 § C
Maximum Junction Temperature
150 § C
g 22V
Operating Temperature Range T A(MIN)
T A(MAX)
Internal Power Dissipation (Note 1)
500 mW
LM725
b 55 § Cto a 125 § C
Differential Input Voltage
g 5V
LM725A
b 55 § Cto a 125 § C
Input Voltage (Note 2)
g 22V
LM725C
0 § Cto 70 § C
Electrical Characteristics (Note 3)
Parameter
Conditions
LM725A
LM725
LM725C
Units
Min Typ Max Min Typ Max Min Typ Max
Input Offset Voltage
T A e 25 § C,
0.5
0.5 1.0
0.5 2.5 mV
(Without External Trim) R S s 10 k X
Input Offset Current
T A e 25 § C
2.0 5.0
2.0 20
2.0 35 nA
Input Bias Current
T A e 25 § C
42 80
42 100
42 125 nA
Input Noise Voltage
T A e 25 § C
f o e 10 Hz
15
15
15
nV/
0
Hz
f o e 100 Hz
9.0
9.0
9.0
nV/
0
Hz
f o e 1 kHz
8.0
8.0
8.0
nV/
0
Hz
Input Noise Current
T A e 25 § C
f o e 10 Hz
1.0
1.0
1.0
pA/
0
Hz
f o e 100 Hz
0.3
0.3
0.3
pA/
0
Hz
f o e 1 kHz
0.15
0.15
0.15
pA/
0
Hz
Input Resistance
T A e 25 § C
1.5
1.5
1.5
M X
Input Voltage Range
T A e 25 § C g 13.5 g 14
g 13.5 g 14
g 13.5 g 14
V
Large Signal Voltage Gain T A e 25 § C,
R L t 2k X ,
1000 3000
1000 3000
250 3000
V/mV
V OUT e g 10V
Common-Mode
T A e 25 § C,
120
110 120
94
120
dB
Rejection Ratio
R S s 10 k X
Power Supply
T A e 25 § C,
2.0 5.0
2.0 10
2.0 35 m V/V
Rejection Ratio
R S s 10 k X
Output Voltage Swing
T A e 25 § C,
R L t 10 k X g 12.5 g 13.5
g 12 g 13.5
g 12 g 13.5
V
R L t 2k X g 12.0
g 13.5
g 10
g 13.5
g 10
g 13.5
V
Power Consumption
T A e 25 § C
80 105
80 105
80 150 mW
Input Offset Voltage
R S s 10 k X
0.7
1.5
3.5 mV
(Without External Trim)
Average Input Offset
R S e 50 X
Voltage Drift
2.0
2.0 5.0
2.0
m V/ § C
(Without External Trim)
Average Input Offset
R S e 50 X
Voltage Drift
0.6 1.0
0.6
0.6
m V/ § C
(With External Trim)
Input Offset Current
T A e T MAX
1.2 4.0
1.2 20
1.2 35 nA
T A e T MIN
7.5 18.0
7.5 40
4.0 50 nA
Average Input Offset
35 90
35 150
10
pA/ § C
Current Drift
Input Bias Current
T A e T MAX
20 70
20 100
125 nA
T A e T MIN
80 180
80 200
250 nA
2
90960204.004.png
Electrical Characteristics (Note 3) (Continued)
Parameter
Conditions
LM725A
LM725
LM725C
Units
Min Typ Max Min Typ Max Min Typ Max
Large Signal Voltage Gain R L t 2k X
T A e T MAX 1,000,000
1,000,000
125,000
V/V
R L t 2k X
T A e T MIN 500,000
250,000
125,000
V/V
Common-Mode
R S s 10 k X
110
100
115
dB
Rejection Ratio
Power Supply
R S s 10 k X
8.0
20
20
m V/V
Rejection Ratio
Output Voltage Swing R L t 2k X g 12
g 10
g 10
V
Note 1: Derate at 150 § C/W for operation at ambient temperatures above 75 § C.
Note 2: For supply voltages less than g 22V, the absolute maximum input voltage is equal to the supply voltage.
Note 3: These specifications apply for V S e g 15V unless otherwise specified.
Note 4: For Military electrical specifications RETS725AX are available for LM725AH and RETS725X are available for LM725H.
Schematic Diagram
TL/H/10474±5
3
90960204.005.png
Typical Performance Characteristics
Voltage Gain vs Temperature
Change in Trimmed Input
Untrimmed Input Offset
for Supply Voltages
Offset Voltage vs Temperature
Voltage vs Temperature
Stabilization Time of
Input Offset Current
Input Bias Current
Input Offset Voltage
vs Temperature
vs Temperature
from Power Turn-On
TL/H/10474±6
4
90960204.006.png
 
Typical Performance Characteristics (Continued)
Change in Input
Offset Voltage Due to
Input Noise
Input Noise
Thermal Shock vs Time
Voltage vs Frequency
Current vs Frequency
Open Loop Frequency
Values for Suggested Compen-
Power Consumption
Response for Values
sation Networks vs Various
vs Temperature
of Compensation (Note 1)
Close Loop Voltage Gains
Frequency Response for
Various Close Loop
Output Voltage Swing
Gain (Note 1)
vs Frequency (Note 1)
Transient Response
TL/H/10474±7
Note 1: Performance is shown using recommended compensation networks.
Transient Response Test Circuit
TL/H/10474±8
5
90960204.001.png 90960204.002.png
 

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