LM725 LM725 Operational Amplifier Literature Number: SNOS552C October 4, 2011 LM725 Operational Amplifier General Description Features 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 applications over a wide supply voltage range. The LM725A has tightened electrical performance with higher input accuracy and like the LM725, is guaranteed over a -55 C to +125C temperature range. The LM725C has slightly relaxed specifications and has its performance guaranteed over a 0C to 70C temperature range. Connection Diagrams Typical Applications Metal Can Package High open loop gain 3,000,000 Low input voltage drift 0.6 V/C High common mode rejection 120 dB Low input noise current 0.15 pA/Hz Low input offset current 2 nA High input voltage range 14V Wide power supply range 3V to 22V Offset null capability Output short circuit protection Thermocouple Amplifier 1047401 Order Number LM725H/883, LM725CH or LM725AH/883 See NS Package Number H08C 1047410 Dual-In-Line Package 1047402 Order Number LM725CN See NS Package Number N08E (c) 2011 National Semiconductor Corporation 10474 10474 Version 6 Revision 2 www.national.com Print Date/Time: 2011/10/04 12:54:30 LM725 Operational Amplifier OBSOLETE LM725 Lead Temperature (Soldering, 10 Sec.) Maximum Junction Temperature 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 Internal Power Dissipation (Note 2) Differential Input Voltage Input Voltage (Note 3) Storage Temperature Range Parameter Conditions Input Offset Voltage TA = 25C, (Without External Trim) RS 10 k Input Offset Current TA = 25C Input Bias Current TA = 25C Input Noise Voltage TA = 25C Input Noise Current Operating Temperature Range LM725 LM725A LM725C 22V 500 mW 5V 22V -65C to +150C Electrical Characteristics 260C 150C TA(MIN) -55C -55C 0C TA(MAX) to +125C to +125C to +70C (Note 4) LM725A Min LM725 Typ Max Min Typ 0.5 0.5 2.0 5.0 42 80 LM725C Max Min Typ 1.0 0.5 2.0 20 42 100 Max Units 2.5 mV 2.0 35 nA 42 125 nA fo = 10 Hz 15 15 15 nV/Hz fo = 100 Hz 9.0 9.0 9.0 nV/Hz fo = 1 kHz 8.0 8.0 8.0 nV/Hz fo = 10 Hz 1.0 1.0 1.0 pA/Hz fo = 100 Hz 0.3 0.3 0.3 pA/Hz fo = 1 kHz 0.15 0.15 0.15 pA/Hz TA = 25C Input Resistance TA = 25C Input Voltage Range TA = 25C Large Signal Voltage Gain TA = 25C, RL 2 k, 1.5 M 13.5 14 1.5 13.5 14 1.5 13.5 14 V 1000 3000 1000 3000 250 3000 V/mV 110 120 94 120 dB VOUT = 10V Common-Mode TA = 25C, Rejection Ratio RS 10 k Power Supply TA = 25C, Rejection Ratio RS 10 k Output Voltage Swing TA = 25C, 120 2.0 5.0 2.0 10 2.0 35 V/V RL 10 k 12.5 13.5 12 13.5 12 13.5 V RL 2 k 12.0 13.5 10 13.5 10 13.5 V Power Consumption TA = 25C Input Offset Voltage RS 10 k 80 105 80 0.7 105 80 1.5 150 mW 3.5 mV (Without External Trim) Average Input Offset RS = 50 Voltage Drift 2.0 2.0 1.0 0.6 5.0 2.0 V/C 0.6 V/C (Without External Trim) Average Input Offset RS = 50 Voltage Drift 0.6 (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 nA www.national.com 2 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 Conditions LM725A Min Average Input Offset Current Drift Input Bias Current Large Signal Voltage Gain LM725 Typ Max Min Typ LM725C Max Min Typ Max 10 Units 35 90 35 150 pA/C TA = TMAX 20 70 20 100 125 nA TA = TMIN 80 180 80 200 250 nA RL 2 k TA = TMAX 1,000,000 1,000,000 125,000 V/V 500,000 250,000 125,000 V/V 110 100 RL 2 k TA = TMIN Common-Mode RS 10 k 115 dB 20 V/V Rejection Ratio Power Supply RS 10 k 8.0 20 Rejection Ratio Output 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 is functional, 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 1047405 3 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 www.national.com LM725 Parameter LM725 Typical Performance Characteristics Voltage Gain vs Temperature for Supply Voltages Change in Trimmed Input Offset Voltage vs Temperature 1047415 1047416 Untrimmed Input Offset Voltage vs Temperature Input Offset Current vs Temperature 1047417 1047418 Input Bias Current vs Temperature Stabilization Time of Input Offset Voltage from Power Turn-On 1047419 1047420 www.national.com 4 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 LM725 Change in Input Offset Voltage Due to Thermal Shock vs Time Input Noise Voltage vs Frequency 1047422 1047421 Input Noise Current vs Frequency Power Consumption vs Temperature 1047424 1047423 Open Loop Frequency Response for Values of Compensation (Note 6) Values for Suggested Compensation Networks vs Various Close Loop Voltage Gains 1047426 1047425 5 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 www.national.com LM725 Frequency Response for Various Close Loop Gain (Note 6) Output Voltage Swing vs Frequency (Note 6) 1047428 1047427 Transient Response 1047429 Note 6: Performance is shown using recommended compensation networks. Transient Response Test Circuit 1047408 www.national.com 6 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 LM725 Auxiliary Circuits Voltage Offset Null Circuit 1047403 Frequency Compensation Circuit 1047404 Compensation Component Values R1 C1 R2 C2 () (F) () (F) 10,000 10k 50 pF 1,000 470 0.001 100 47 0.01 10 27 0.05 270 0.0015 1 10 0.05 39 0.02 AV 7 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 www.national.com LM725 Typical Applications Photodiode Amplifier 1047409 DC Gains = 10,000; 1,000; 100; and 10 Bandwidth = Determined by value of C1 Thermocouple Amplifier 1047410 Note: Indicates 1% metal film resistors recommended for temperature stability. www.national.com 8 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 LM725 100V Common Mode Range Differential Amplifier 1047411 9 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 www.national.com LM725 Instrumentation Amplifier with High Common Mode Rejection 1047412 Precision Amplifier AVCL = 1000 1047413 www.national.com 10 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 LM725 Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM725H/883, LM725CH or LM725AH/883 NS Package Number H08C Order Number LM725CN NS Package Number N08E 11 10474 Version 6 Revision 2 Print Date/Time: 2011/10/04 12:54:30 www.national.com LM725 Operational Amplifier Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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