LM725CH

LM725 Operational Amplifier May 1998 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 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 +125˚C temperature range. The LM725C has slightly relaxed specifications and has its performance guaranteed over a 0˚C to 70˚C temperature range. Features n n n n n n n n n High open loop gain 3,000,000 Low input voltage drift 0.6 µV/˚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 Connection Diagrams Metal Can Package Dual-In-Line Package DS010474-2 Order Number LM725CN See NS Package Number N08E DS010474-1 Order Number LM725H/883, LM725CH or LM725AH/883 See NS Package Number H08C © 1999 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 Internal Power Dissipation (Note 2) Differential Input Voltage Input Voltage (Note 3) Storage Temperature Range Lead Temperature (Soldering, 10 Sec.) Maximum Junction Temperature Operating Temperature Range LM725 LM725A LM725C TA(MIN) −55˚C −55˚C 0˚C to to to 260˚C 150˚C TA(MAX) +125˚C +125˚C +70˚C ± 22V 500 mW ± 5V ± 22V −65˚C to +150˚C Electrical Characteristics (Note 4) Parameter Input Offset Voltage (Without External Trim) Input Offset Current Input Bias Current Input Noise Voltage Conditions Min TA = 25˚C, RS ≤ 10 kΩ TA = 25˚C TA = 25˚C TA = 25˚C fo = 10 Hz fo = 100 Hz fo = 1 kHz Input Noise Current TA = 25˚C fo = 10 Hz fo = 100 Hz fo = 1 kHz TA = 25˚C TA = 25˚C TA = 25˚C, RL ≥ 2 kΩ, VOUT = ± 10V TA = 25˚C, RS ≤ 10 kΩ TA = 25˚C, RS ≤ 10 kΩ TA = 25˚C, RL ≥ 10 kΩ Power Consumption Input Offset Voltage (Without External Trim) Average Input Offset Voltage Drift (Without External Trim) Average Input Offset Voltage Drift (With External Trim) Input Offset Current Average Input Offset Current Drift Input Bias Current TA = TMAX TA = TMIN 20 80 70 180 2 LM725A Typ Max 0.5 2.0 42 15 9.0 8.0 1.0 0.3 0.15 1.5 5.0 80 Min LM725 Typ Max 0.5 2.0 42 15 9.0 8.0 1.0 0.3 0.15 1.5 1.0 20 100 Min LM725C Typ Max 0.5 2.0 42 15 9.0 8.0 1.0 0.3 0.15 1.5 2.5 35 125 Units mV nA nA nV/√Hz nV/√Hz nV/√Hz pA/√Hz pA/√Hz pA/√Hz MΩ V V/mV dB 35 µV/V Input Resistance Input Voltage Range Large Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing ± 13.5 1000 120 ± 14 3000 ± 13.5 1000 110 ± 14 3000 120 2.0 10 ± 13.5 250 94 ± 14 3000 120 2.0 2.0 5.0 RL ≥ 2 kΩ TA = 25˚C RS ≤ 10 kΩ RS = 50Ω ± 12.5 ± 12.0 ± 13.5 ± 13.5 80 105 0.7 ± 12 ± 10 ± 13.5 ± 13.5 80 105 1.5 ± 12 ± 10 ± 13.5 ± 13.5 80 150 3.5 V V mW mV 2.0 RS = 50Ω 0.6 TA = TMAX TA = TMIN 1.2 7.5 35 1.0 4.0 18.0 90 2.0 5.0 2.0 µV/˚C 0.6 1.2 7.5 35 20 80 20 40 150 100 200 0.6 1.2 4.0 10 125 250 35 50 µV/˚C nA nA pA/˚C nA nA www.national.com Electrical Characteristics (Note 4) Parameter Large Signal Voltage Gain Conditions Min RL ≥ 2 kΩ TA = TMAX RL ≥ 2 kΩ TA = TMIN Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing RL ≥ 2 kΩ RS ≤ 10 kΩ RS ≤ 10 kΩ (Continued) LM725 Min 1,000,000 250,000 100 8.0 20 Typ Max Min 125,000 125,000 115 20 LM725C Typ Max V/V V/V dB µV/V V Units LM725A Typ Max 1,000,000 500,000 110 ± 12 ± 10 ± 10 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 150˚C/W for operation at ambient temperatures above 75˚C. 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 DS010474-5 3 www.national.com Typical Performance Characteristics Voltage Gain vs Temperature for Supply Voltages Change in Trimmed Input Offset Voltage vs Temperature Untrimmed Input Offset Voltage vs Temperature DS010474-15 DS010474-16 DS010474-17 Input Offset Current vs Temperature Input Bias Current vs Temperature Stabilization Time of Input Offset Voltage from Power Turn-On DS010474-18 DS010474-19 DS010474-20 Change in Input Offset Voltage Due to Thermal Shock vs Time Input Noise Voltage vs Frequency Input Noise Current vs Frequency DS010474-22 DS010474-21 DS010474-23 www.national.com 4 Typical Performance Characteristics Power Consumption vs Temperature (Continued) Open Loop Frequency Response for Values of Compensation (Note 6) Values for Suggested Compensation Networks vs Various Close Loop Voltage Gains DS010474-24 DS010474-25 DS010474-26 Frequency Response for Various Close Loop Gain (Note 6) Output Voltage Swing vs Frequency (Note 6) Transient Response DS010474-29 DS010474-28 DS010474-27 Note 6: Performance is shown using recommended compensation networks. Transient Response Test Circuit DS010474-8 5 www.national.com Auxiliary Circuits Voltage Offset Null Circuit DS010474-3 Frequency Compensation Circuit DS010474-4 Compensation Component Values AV 10,000 1,000 100 10 1 R1 (Ω) 10k 470 47 27 10 C1 (µF) 50 pF 0.001 0.01 0.05 0.05 270 39 0.0015 0.02 R2 (Ω) C2 (µF) www.national.com 6 Typical Applications Photodiode Amplifier DS010474-9 DC Gains = 10,000; 1,000; 100; and 10 Bandwidth = Determined by value of C1 Thermocouple Amplifier DS010474-10 Note: Indicates ± 1% metal film resistors recommended for temperature stability. 7 www.national.com Typical Applications (Continued) ± 100V Common Mode Range Differential Amplifier DS010474-11 Instrumentation Amplifier with High Common Mode Rejection DS010474-12 www.national.com 8 Typical Applications (Continued) Precision Amplifier AVCL = 1000 DS010474-13 9 www.national.com 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 www.national.com 10 LM725 Operational Amplifier Notes LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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 when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.