LM108,LM208,LM308 LM108/LM208/LM308 Operational Amplifiers Literature Number: SNOSBS5A LM108/LM208/LM308 Operational Amplifiers General Description The LM108 series are precision operational amplifiers having specifications a factor of ten better than FET amplifiers over a -55C to +125C temperature range. The devices operate with supply voltages from 2V to 20V and have sufficient supply rejection to use unregulated supplies. Although the circuit is interchangeable with and uses the same compensation as the LM101A, an alternate compensation scheme can be used to make it particularly insensitive to power supply noise and to make supply bypass capacitors unnecessary. The low current error of the LM108 series makes possible many designs that are not practical with conventional ampli- fiers. In fact, it operates from 10 M source resistances, introducing less error than devices like the 709 with 10 k sources. Integrators with drifts less than 500 V/sec and analog time delays in excess of one hour can be made using capacitors no larger than 1 F. The LM108 is guaranteed from -55C to +125C, the LM208 from -25C to +85C, and the LM308 from 0C to +70C. Features Maximum input bias current of 3.0 nA over temperature Offset current less than 400 pA over temperature Supply current of only 300 A, even in saturation Guaranteed drift characteristics Alternate Frequency Compensation (Note 1) Compensation Circuits Standard Compensation Circuit 775802 **Bandwidth and slew rate are proportional to 1/Cs 775801 Note 1: Improves rejection of power supply noise by a factor of ten. CO = 30 pF **Bandwidth and slew rate are proportional to 1/Cf (c) 2011 National Semiconductor Corporation 7758 7758 Version 3 Revision 3 www.national.com Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Operational Amplifiers OBSOLETE September 22, 2011 LM108/LM208/LM308 Feedforward Compensation 775803 www.national.com 2 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 (Note 7) Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM108/LM208 20V 500 mW 10 mA 15V Continuous -55C to +125C -25C to + 85C Supply Voltage Power Dissipation (Note 3) Differential Input Current (Note 4) Input Voltage (Note 5) Output Short-Circuit Duration Operating Temperature Range (LM108) LM308 18V 500 mW 10 mA 15V Continuous 0C to +70C (LM208) Storage Temperature Range -65C to +150C Lead Temperature (Soldering, 10 sec) DIP 260C H Package Lead Temp (Soldering 10 seconds) 300C Soldering Information Dual-In-Line Package Soldering (10 seconds) 260C Small Outline Package Vapor Phase (60 seconds) 215C Infrared (15 seconds) 220C See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of soldering surface mount devices. ESD Tolerance (Note 8) 2000V Electrical Characteristics Parameter -65C to +150C 260C 300C (Note 6) Condition LM108/LM208 Min LM308 Typ Max Min Typ Max Units Input Offset Voltage TA = 25C 0.7 2.0 2.0 7.5 mV Input Offset Current TA = 25C 0.05 0.2 0.2 1 nA Input Bias Current TA = 25C 0.8 2.0 1.5 7 nA Input Resistance TA = 25C Supply Current TA = 25C Large Signal Voltage TA = 25C, VS = 15V Gain VOUT = 10V, RL 10 k 30 70 0.3 50 10 0.6 300 Input Offset Voltage 40 0.3 25 300 3.0 Average Temperature Coefficient of Input 3.0 15 M 0.8 6.0 mA V/mV 10 mV 30 V/C 1.5 nA 10 pA/C Offset Voltage Input Offset Current 0.4 Average Temperature Coefficient of Input Offset Current 0.5 Input Bias Current 2.5 2.0 3.0 Supply Current TA = +125C Large Signal Voltage VS = 15V, VOUT = 10V Gain RL 10 k Output Voltage Swing VS = 15V, RL = 10 k Input Voltage Range VS = 15V 0.15 10 0.4 25 13 13.5 15 14 13 14 3 7758 Version 3 Revision 3 nA mA Print Date/Time: 2011/09/22 12:58:18 V/mV 14 V V www.national.com LM108/LM208/LM308 Parameter Condition LM108/LM208 Min Typ Common Mode Rejection Ratio 85 Supply Voltage Rejection Ratio 80 LM308 Max Max Units Min Typ 100 80 100 dB 96 80 96 dB Note 2: 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 3: The maximum junction temperature of the LM108 is 150C, for the LM208, 100C and for the LM308, 85C. For operating at elevated temperatures, devices in the H08 package must be derated based on a thermal resistance of 160C/W, junction to ambient, or 20C/W, junction to case. The thermal resistance of the dual-in-line package is 100C/W, junction to ambient. Note 4: The inputs are shunted with back-to-back diodes for overvoltage protection. Therefore, excessive current will flow if a differential input voltage in excess of 1V is applied between the inputs unless some limiting resistance is used. Note 5: For supply voltages less than 15V, the absolute maximum input voltage is equal to the supply voltage. Note 6: These specifications apply for 5V VS 20V and -55C TA +125C, unless otherwise specified. With the LM208, however, all temperature specifications are limited to -25C TA 85C, and for the LM308 they are limited to 0C TA 70C. Note 7: Refer to RETS108X for LM108 military specifications and RETs 108AX for LM108A military specifications. Note 8: Human body model, 1.5 k in series with 100 pF. Schematic Diagram 775808 www.national.com 4 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Typical Performance Characteristics LM108/LM208 Input Currents Offset Error 775818 775819 Drift Error Input Noise Voltage 775820 775821 Power Supply Rejection Closed Loop Output Impedance 775822 775823 5 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Voltage Gain Output Swing 775824 775825 Supply Current Open Loop Frequency Response 775826 775827 Large Signal Frequency Response Voltage Follower Pulse Response 775828 www.national.com 775829 6 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Typical Performance Characteristics LM308 Input Currents Offset Error 775830 775831 Drift Error Input Noise Voltage 775832 775833 Power Supply Rejection Closed Loop Output Impedance 775834 775835 7 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Voltage Gain Output Swing 775836 775837 Supply Current Open Loop Frequency Response 775838 775839 Large Signal Frequency Response Voltage Follower Pulse Response 775840 www.national.com 775841 8 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Open Loop Frequency Response Large Signal Frequency Response 775839 775840 Voltage Follower Pulse Response 775841 Typical Applications Sample and Hold 775804 Teflon polyethylene or polycarbonate dielectric capacitor Worst case drift less than 2.5 mV/sec 9 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 High Speed Amplifier with Low Drift and Low Input Current 775805 Fast Summing Amplifier (Note 9) 775812 *In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability and eliminates thermal feedback. Note 9: Power Bandwidth: 250 KHz Small Signal Bandwidth: 3.5 MHz Slew Rate: 10V/S www.national.com 10 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Connection Diagrams Metal Can Package 775816 Top View Order Number LM108J/883 See NS Package Number J14A 775813 *Package is connected to Pin 4 (V-) **Unused pin (no internal connection) to allow for input anti-leakage guard ring on printed circuit board layout. Order Number LM108H, LM108H/883, LM308AH or LM308H See NS Package Number H08C Dual-In-Line Package 775817 Also available per JM38510/10104 Order Number LM108W/883 See NS Package Number W10A 775815 Top View Order Number LM108J-8/883, LM308M or LM308N See NS Package Number J08A, M08A or N08E 11 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number LM108J/883 NS Package Number J08A www.national.com 12 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Ceramic Dual-In-Line Package (J) Order Number LM108/883 NS Package Number J14A 13 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Metal Can Package (H) Order Number LM108H, LM108H/883 or LM308H NS Package Number H08C www.national.com 14 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 S.O. Package (M) Order Number LM308M NS Package Number M08A Molded Dual-In-Line Package (N) Order Number LM308N NS Package Number N08E 15 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Ceramic Flatpack Package (W) Order Number LM108AW/883 or LM108W/883 NS Package Number W10A www.national.com 16 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 LM108/LM208/LM308 Notes 17 7758 Version 3 Revision 3 Print Date/Time: 2011/09/22 12:58:18 www.national.com LM108/LM208/LM308 Operational Amplifiers 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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