-
LM725Operational AmplifierGeneral DescriptionThe
LM725/LM725A/LM725C are operational amplifiers fea-turing superior
performance in applications where low noise,low drift, and accurate
closed-loop gain are required. Withhigh common mode rejection and
offset null capability, it isespecially suited for low level
instrumentation applicationsover a wide supply voltage range.The
LM725A has tightened electrical performance withhigher input
accuracy and like the LM725, is guaranteedover a 55C to +125C
temperature range. The LM725Chas slightly relaxed specifications
and has its performanceguaranteed over a 0C to 70C temperature
range.
Featuresn High open loop gain 3,000,000n Low input voltage drift
0.6 V/Cn High common mode rejection 120 dBn Low input noise current
0.15 pA/Hzn Low input offset current 2 nAn High input voltage range
14Vn Wide power supply range 3V to 22Vn Offset null capabilityn
Output short circuit protection
Connection DiagramsMetal Can Package
01047401
Order Number LM725H/883, LM725CH or LM725AH/883See NS Package
Number H08C
Dual-In-Line Package
01047402
Order Number LM725CNSee NS Package Number N08E
Typical ApplicationsThermocouple Amplifier
01047410
August 2000LM
725OperationalAm
plifier
2004 National Semiconductor Corporation DS010474
www.national.com
-
Absolute Maximum Ratings (Note 1)If Military/Aerospace specified
devices are required,please contact the National Semiconductor
Sales Office/Distributors for availability and specifications.
Supply Voltage 22VInternal Power Dissipation (Note 2) 500
mWDifferential Input Voltage 5VInput Voltage (Note 3) 22VStorage
Temperature Range 65C to +150C
Lead Temperature(Soldering, 10 Sec.) 260C
Maximum Junction Temperature 150COperating Temperature Range
TA(MIN) TA(MAX)
LM725 55C to +125CLM725A 55C to +125CLM725C 0C to +70C
Electrical Characteristics (Note 4)
Parameter ConditionsLM725A LM725 LM725C
UnitsMin Typ Max Min Typ Max Min Typ MaxInput Offset Voltage TA
= 25C, 0.5 0.5 1.0 0.5 2.5 mV(Without External Trim) RS 10 kInput
Offset Current TA = 25C 2.0 5.0 2.0 20 2.0 35 nAInput Bias Current
TA = 25C 42 80 42 100 42 125 nAInput Noise Voltage TA = 25C
fo = 10 Hz 15 15 15 nV/Hzfo = 100 Hz 9.0 9.0 9.0 nV/Hzfo = 1 kHz
8.0 8.0 8.0 nV/Hz
Input Noise Current TA = 25Cfo = 10 Hz 1.0 1.0 1.0 pA/Hzfo = 100
Hz 0.3 0.3 0.3 pA/Hzfo = 1 kHz 0.15 0.15 0.15 pA/Hz
Input Resistance TA = 25C 1.5 1.5 1.5 MInput Voltage Range TA =
25C 13.5 14 13.5 14 13.5 14 VLarge Signal Voltage Gain TA =
25C,
RL 2 k, 1000 3000 1000 3000 250 3000 V/mVVOUT = 10V
Common-Mode TA = 25C, 120 110 120 94 120 dBRejection Ratio RS 10
kPower Supply TA = 25C, 2.0 5.0 2.0 10 2.0 35 V/VRejection Ratio RS
10 kOutput Voltage Swing TA = 25C,
RL 10 k 12.5 13.5 12 13.5 12 13.5 VRL 2 k 12.0 13.5 10 13.5 10
13.5 V
Power Consumption TA = 25C 80 105 80 105 80 150 mWInput Offset
Voltage RS 10 k 0.7 1.5 3.5 mV(Without External Trim)Average Input
Offset RS = 50Voltage Drift 2.0 2.0 5.0 2.0 V/C(Without External
Trim)Average Input Offset RS = 50Voltage Drift 0.6 1.0 0.6 0.6
V/C(With External Trim)Input Offset Current TA = TMAX 1.2 4.0 1.2
20 1.2 35 nA
TA = TMIN 7.5 18.0 7.5 40 4.0 50 nAAverage Input Offset 35 90 35
150 10 pA/CCurrent DriftInput Bias Current TA = TMAX 20 70 20 100
125 nA
TA = TMIN 80 180 80 200 250 nA
LM72
5
www.national.com 2
-
Electrical Characteristics (Note 4) (Continued)
Parameter ConditionsLM725A LM725 LM725C
UnitsMin Typ Max Min Typ Max Min Typ MaxLarge Signal Voltage
Gain RL 2 k
TA = TMAX 1,000,000 1,000,000 125,000 V/VRL 2 kTA = TMIN 500,000
250,000 125,000 V/V
Common-Mode RS 10 k 110 100 115 dBRejection RatioPower Supply RS
10 k 8.0 20 20 V/VRejection RatioOutput Voltage Swing RL 2 k 12 10
10 V
Note 1: Absolute Maximum Ratings indicate limits beyond which
damage to the device may occur. Operating Ratings indicate
conditions for which the device isfunctional, but do not guarantee
specific performance limits.Note 2: Derate at 150C/W for operation
at ambient temperatures above 75C.Note 3: For supply voltages less
than 22V, the absolute maximum input voltage is equal to the supply
voltage.Note 4: These specifications apply for VS = 15V unless
otherwise specified.Note 5: For Military electrical specifications
RETS725AX are available for LM725AH and RETS725X are available for
LM725H.
Schematic Diagram
01047405
LM725
www.national.com3
-
Typical Performance CharacteristicsVoltage Gain vs
Temperature
for Supply VoltagesChange in Trimmed Input
Offset Voltage vs Temperature
01047415 01047416
Untrimmed Input OffsetVoltage vs Temperature
Input Offset Currentvs Temperature
01047417 01047418
Input Bias Currentvs Temperature
Stabilization Time ofInput Offset Voltagefrom Power Turn-On
01047419 01047420
LM72
5
www.national.com 4
-
Typical Performance Characteristics (Continued)Change in
Input
Offset Voltage Due toThermal Shock vs Time
Input NoiseVoltage vs Frequency
01047421 01047422
Input NoiseCurrent vs Frequency
Power Consumptionvs Temperature
0104742301047424
Open Loop FrequencyResponse for Values
of Compensation (Note 6)
Values for Suggested Compen-sation Networks vs VariousClose Loop
Voltage Gains
01047425 01047426
LM725
www.national.com5
-
Typical Performance Characteristics (Continued)Frequency
Response for
Various Close LoopGain (Note 6)
Output Voltage Swingvs Frequency (Note 6)
01047427 01047428
Transient Response
01047429
Note 6: Performance is shown using recommended
compensationnetworks.
Transient Response Test Circuit
01047408
LM72
5
www.national.com 6
-
Auxiliary CircuitsVoltage Offset
Null Circuit
01047403
Frequency CompensationCircuit
01047404
Compensation Component ValuesAV R1 C1 R2 C2
() (F) () (F)10,000 10k 50 pF1,000 470 0.001100 47 0.0110 27
0.05 270 0.00151 10 0.05 39 0.02
LM725
www.national.com7
-
Typical ApplicationsPhotodiode Amplifier
01047409DC Gains = 10,000; 1,000; 100; and 10Bandwidth =
Determined by value of C1
Thermocouple Amplifier
01047410
Note: Indicates 1% metal film resistors recommended for
temperature stability.
LM72
5
www.national.com 8
-
Typical Applications (Continued)100V Common Mode Range
Differential Amplifier
01047411
LM725
www.national.com9
-
Typical Applications (Continued)Instrumentation Amplifier with
High
Common Mode Rejection
01047412
Precision Amplifier AVCL = 1000
01047413
LM72
5
www.national.com 10
-
Physical Dimensions inches (millimeters)unless otherwise
noted
Order Number LM725H/883, LM725CH or LM725AH/883NS Package Number
H08C
Order Number LM725CNNS Package Number N08E
LM725
www.national.com11
-
Notes
National does not assume any responsibility for use of any
circuitry described, no circuit patent licenses are implied and
National reservesthe right at any time without notice to change
said circuitry and specifications.For the most current product
information visit us at www.national.com.
LIFE SUPPORT POLICYNATIONALS PRODUCTS ARE NOT AUTHORIZED FOR USE
AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMSWITHOUT
THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL
OF NATIONAL SEMICONDUCTORCORPORATION. As used herein:1. Life
support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or(b) support or sustain life, and whose failure to perform
whenproperly used in accordance with instructions for useprovided
in the labeling, can be reasonably expected to resultin a
significant injury to the user.
2. A critical component is any component of a life supportdevice
or system whose failure to perform can be reasonablyexpected to
cause the failure of the life support device orsystem, or to affect
its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCENational Semiconductor certifies that
the products and packing materials meet the provisions of the
Customer Products StewardshipSpecification (CSP-9-111C2) and the
Banned Substances and Materials of Interest Specification
(CSP-9-111S2) and contain no BannedSubstances as defined in
CSP-9-111S2.
National SemiconductorAmericas CustomerSupport CenterEmail:
[email protected]: 1-800-272-9959
National SemiconductorEurope Customer Support Center
Fax: +49 (0) 180-530 85 86Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208English Tel: +44 (0) 870 24 0
2171Franais Tel: +33 (0) 1 41 91 8790
National SemiconductorAsia Pacific CustomerSupport CenterEmail:
[email protected]
National SemiconductorJapan Customer Support CenterFax:
81-3-5639-7507Email: [email protected]: 81-3-5639-7560
www.national.com
LM72
5Op
erat
iona
lAm
plifi
er
-
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
LM725General DescriptionFeaturesConnection DiagramsTypical
ApplicationsAbsolute Maximum RatingsElectrical Characteristics
Schematic DiagramTypical Performance CharacteristicsAuxiliary
CircuitsCompensation Component Values
Typical ApplicationsPhysical Dimensions
