Home

National Semiconductor LM108A/LM208A/LM308A Operational Amplifiers handbook

1. 150 C H Package Lead Temperature Soldering 10 sec 300 C Electrical Characteristics note 4 Lead Temperature Soldering 10 sec DIP Soldering Information Dual In Line Package Soldering 10 sec Small Outline Package Vapor phase 60 sec Infrared 15 sec 260 C 260 C 215 C 220 C See An 450 Surface Mounting Methods and Their Effect on Product Reliability for other methods of soldering sur face mount devices ESD rating to be determined Parameter Conditions Min Typ Max Units nput Offset Voltage Ta 25 C 0 3 0 5 mV nput Offset Current TA 25 C 0 2 1 nA nput Bias Current Ta 25 C 1 5 7 nA nput Resistance Ta 25 C 10 40 MQ Supply Current TA 25 C Vg 15V 0 3 0 8 mA Em NS Large Signal Voltage Gain M eh es d a 80 300 V mV nput Offset Voltage Vs 15V Rs 1000 0 73 mV dca Vs 15V Rs 1000 20 50 uVv C nput Offset Current 1 5 nA dicerc alia s w ome nput Bias Current 10 nA Large Signal Voltage Gain Vs 15V Vout t10V 60 V mV RL 2 10kQ Output Voltage Swing Vs 15V RL 10kQ 13 14 V nput Voltage Range Vs 15V 14 V Common Mode Rejection Ratio 96 110 dB Supply Voltage Rejection Ratio 96 110 dB Note 1 The maximum junction temperature of the LM308A is 85 C For operating at elevated temperatures devices in the H08 package must be derated based on a thermal resistance of 160 C W junction t
2. C while that of the LM208A is 100 C For operating at elevated temperatures devices in the H08 package must be derated based on a thermal resistance of 160 C W junction to ambient or 20 C W junction to case The thermal resistance of the dual in line package is 100 C W junction to ambient Note 2 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 3 For supply voltages less than 15V the absolute maximum input voltage is equal to the supply voltage Note 4 These specifications apply for 5V x Vg 20V and 55 C lt T4 lt 125 C unless otherwise specified With the LM208A however all temperature specifications are limited to 25 C lt TA lt 85 C Note 5 Refer to RETS108AX for LM108AH and LM1084AJ 8 military specifications Note 6 Human body model 1 5 kQ in series with 100 pF LM308A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 18V Power Dissipation Note 1 500 mW Differential Input Current Note 2 10 mA Input Voltage Note 3 15V Output Short Circuit Duration Continuous Operating Temperature Range 0 C to 70 C Storage Temperature Range 65 C to
3. OO EM 108A O QN vationat Semiconductor LM108A LM208A LM308A Operational Amplifiers General Description The LM108 LM108A series are precision operational ampli fiers having specifications about a factor of ten better than FET amplifiers over their operating temperature range In addition to low input currents these devices have extremely low offset voltage making it possible to eliminate offset ad justments in most cases and obtain performance ap proaching chopper stabilized amplifiers The devices operate with supply voltages from 2V to X 18V and have sufficient supply rejection to use unregulat ed 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 by pass capacitors unnecessary The low current error of the LM108A series makes possible many designs that are not practical with conventional ampli fiers In fact it operates from 10 MQ source resistances Compensation Circuits Standard Compensation Circuit RI R2 Nin LM108A Vout Vin RIC o gt o R1 R2 Grr Co 30 pF TL H 7759 1 Bandwidth and slew rate are proportional to 1 C Feedforward Compensation c2 5 pF INPUT Bandwidth and slew rate are proportional to 1 Cs LM108A May 1989 introducing less error than devices like the 709 with 10 kQ sources In
4. ange 65 C to 150 C Lead Temperature Soldering 10 sec DIP 260 C Soldering Information Dual In Line Package Soldering 10 sec 260 C Small Outline Package Vapor Phase 60 sec 215 C Infrared 15 sec 220 C See An 450 Surface Mounting Methods and Their Effect on Product Reliability for other methods of soldering sur face mount devices LM108A 55 C to 125 C LM208A 25 C to 85 C ESD Tolerance Note 6 2000V Electrical Characteristics Note 4 Parameter Conditions Min Typ Max Units Input Offset Voltage Ta 25 C 0 3 0 5 mV Input Offset Current Ta 25 C 0 05 0 2 nA Input Bias Current Ta 25 C 0 8 2 0 nA Input Resistance Ta 25 C 30 70 MQ Supply Current Ta 25 C 0 3 0 6 mA Large Signal Voltage Gain TA 25 C Vs 15V Vout 10V RL gt 10 kQ 89 300 VV Input Offset Voltage 1 0 mV Average Temperature Coefficient es of Input Offset Voltage 1 9 5 9 AVEC Input Offset Current 0 4 nA Average Temperature Coefficient of Input Offset Current ve a pane Input Bias Current 3 0 nA Supply Current TA 125 C 0 15 0 4 mA i i Large Signal Voltage Gain Vs 15V Vout 10V 40 V mV RL 2 10kQ Output Voltage Swing Vs 15V RL 10kQ0 13 14 V Input Voltage Range Vs t15V 13 5 Common Mode Rejection Ratio 96 110 dB Supply Voltage Rejection Ratio 96 110 dB Note 1 The maximum junction temperature of the LM108A is 150
5. e Er 3 302 0 127 95 5 d 0 125 0 140 A Z 0 065 3 175 3 556 j 0125 0 020 oms oos ps 559 qr ia 0 508 0 229 0 381 hia TYP an 0 040 NOM 0 018 0 003 0325 0325 gos 0 457 0 076 T ss 51018 0 100 0 010 uas Sioa 2 540 0 254 0 045 0 015 1 143 0 381 i l i amp LO o O0 1 270 20 NORE REV F Molded Dual In Line Package N Order Number LM308AN NS Package Number NO8E 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 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 Europe National Semiconductor Corporation Arlington TX 76017 Tel 1 800 272 9959 Fax 1 800 737 7018 1111 West Bardin Road Fax 49 0 180 530 85 86 Email cnjwge tevm2 nsc com Deutsch Te
6. e two input leads close together helps greatly Resistor choice as well as physical placement is important for minimizing thermocouple effects Carbon oxide film and some metal film resistors can cause large thermocouple er rors Wirewound resistors of evanohm or manganin are best since they only generate about 2 wV C referenced to cop per Of course keeping the resistor ends at the same tem perature is important Generally shielding a low drift stage electrically and thermally will yield good results Schematic Diagram COMPENSATION INPUTS COMPENSATION 8 a ell 2 als pal Resistors can cause other errors besides gradient generat ed voltages If the gain setting resistors do not track with temperature a gain error will result For example a gain of 1000 amplifier with a constant 10 mV input will have a 10V output If the resistors mistrack by 0 5 over the operating temperature range the error at the output is 50 mV Re ferred to input this is a 50 uV error All of the gain fixing resistor should be the same material Testing low drift amplifiers is also difficult Standard drift testing technique such as heating the device in an oven and having the leads available through a connector thermo probe or the soldering iron method do not work Thermal gradients cause much greater errors than the amplifier drift Coupling microvolt signal through connectors is especially bad since the temperature difference ac
7. l 49 0 180 530 85 85 English Tel 49 0 180 532 78 32 Frangais Tel 49 0 180 532 93 58 Italiano Tel 49 0 180 534 16 80 National Semiconductor Japan Ltd Tel 81 043 299 2309 Fax 81 043 299 2408 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel 852 2737 1600 Fax 852 2736 9960 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
8. o ambient or 20 C W junction to case The thermal resistance of the dual in line package is 100 C W junction to ambient Note 2 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 3 For supply voltages less than 15V the absolute maximum input voltage is equal to the supply voltage Note 4 These specifications apply for 5V x Vg lt 15V and 0 C lt Ta x 70 C unless otherwise specified Typical Applications Sample and Hold INPUT OUTPUT 2 TTeflon polyethylene or polycarbonate dielectric capacitor M Worst case drift less than 2 5 mV sec TL H 7759 4 High Speed Amplifier with Low Drift and Low Input Current Pin RE INPUT OUTPUT TL H 7759 5 Application Hints A very low drift amplifier poses some uncommon application and testing problems Many sources of error can cause the apparent circuit drift to be much higher than would be pre dicted Thermocouple effects caused by temperature gradient across dissimilar metals are perhaps the worst offenders Only a few degrees gradient can cause hundreds of micro volts of error The two places this shows up generally are the package to printed circuit board interface and tempera ture gradients across resistors Keeping package leads short and th
9. ross the connector can be 50 C or more The device under test along with the gain setting resistor should be isothermal vt R8 ns aaa Lars Ame OUTPUT RI p 240 v TL H 7759 6 Connection Diagrams Metal Can Package COMP 2 TL H 7759 7 Pin 4 is connected to the case Unused pin no internal connection to allow for input anti leakage guard ring on printed circuit board layout Order Number LM108AH LM208AH or LM208AH See NS Package Number H08C Physical Dimensions inches millimeters 0 350 0 370 8 890 9 398 DIA Dual In Line Package comp COMP 2 INPUT v INPUT OUTPUT v NC TL H 7759 8 Top View Order Number LM108AJ 8 LM208AJ 8 LM308AJ 8 LM308AM or LM308AN See NS Package Number J08A M08A or NO8E 0 315 0 335 8 001 8 509 D MAX 0 025 UNCONTROLLED baer LEAD DIA i EE SEATING PLANE A 0 015 0 040 0 381 1 016 P lee 0 016 0 019 5 TYP 0 165 0 185 4 191 4 699 Y REFERENCE PLANE 0 035 0 500 0 889 12 70 MAX 0 100 Te i 2 540 I 0 029 0 045 i 0 737 1 143 0 028 0 034 x 0 711 0 864 Y X 45 EQUALLY SPACED 0 406 0 483 0 195 0 205 DIA 4 953 5 207 P C 0 115 0 145 2 921 3 683 DIA HO8C REV E Metal Can Package H Order Number LM108AH LM208AH or LM308AH NS Package Number H08C Physical Dimensions inches millimeter
10. s Continued 0 400 MAX R0 010 TYP 0 220 0 291 0 310 MAX GLASS R0 025 TYP 0 065 YP 0 290 GLASS 0 520 SEALANT gd I sone MAX 9 200 r LT T LT T LS ry 0 020 MAX 0 060 F 0 150 0 125 MIN 959 59 TYP 0 055 MAX BOTH ENDS 0 008 0 012 TYP 909 4 TYP 0 018 40 003 TYP 0 100 0 010 TYP J08A REV K Ceramic Dual In Line Package J Order Number LM108AJ 8 LM208AJ 8 or LM308AJ 8 NS Package Number J08A 0 189 0 197 4 800 5 004 8 7 6 5 0 228 0 244 5 791 6 198 0 010 MAX 0 254 uwmwN 6 7 2 3 4 i IDENT n 0 150 0 157 3 810 3 988 0 010 0 020 459 PRIN 0 254 0 508 ee 346 1 ET ALL d ma 0 102 0 254 FELT LN EHEH Y seating i i E p l 4 PLANE 0 10 102 0 014 0 008 0 010 Trane 0 050 0 014 0 020 ALL LEAD TIPS TYP ASTA ET E 120 sd 1 270 oni 4 0 356 0 508 T 0 008 qyp TYP ALL LEADS 0203 Mosa REV 9 S O Package M Order Number LM308AM NS Package Number M08A LM108A LM208A LM308A Operational Amplifiers Physical Dimensions inches millimeters Continued 0 373 0 400 9 474 10 16 0 090 2 286 0 032 0 005 0 813 0 127 0 250 0 005 RAD 6 354 0 127 PIN NO 1 cS OPTION 1 gt e 0 280 0 040 png 0 030 T mp he PE max 1016 0 039 0 300 0 320 0 762 0 145 0 200 7 62 8 128 i ain 0 991 3 683 5 080 ea
11. tegrators with drifts less than 500 wV sec and analog time delays in excess of one hour can be made us ing capacitors no larger than 1 uF The LM208A is identical to the LM108A except that the LM208A has its performance guaranteed over a 25 C to 85 C temperature range instead of 55 C to 125 C The LM308A devices have slightly relaxed specifications and performances over a 0 C to 70 C temperature range Features W Offset voltage guaranteed less than 0 5 mV Maximum input bias current of 3 0 nA over temperature Offset current less than 400 pA over temperature Supply current of only 300 uA even in saturation a m Guaranteed 5 uV C drift Alternate Frequency Compensation RI Nin Vout R2 Vin LM108A l Cs 100 pF Improves rejection of power supply noise by a factor of ten TL H 7759 2 OUTPUT TL H 7759 3 91995 National Semiconductor Corporation TL H 7759 RRD B30M115 Printed in U S A sJeyidury jeuonejedo veoeWw1 V802W1 V80LWT1 LM108A LM208A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Note 5 Supply Voltage 20V Power Dissipation Note 1 500 mW Differential Input Current Note 2 10 mA Input Voltage Note 3 15V Output Short Circuit Duration Continuous Operating Free Air Temperature Range Storage Temperature R

National Semiconductor LM108A/LM208A/LM308A Operational Amplifiers handbook

Contents

Download Pdf Manuals

Related Search

Related Contents