TEXAS INSTR (LIN/INTFC) 50E D MM 89617?e4 00464121 ecb MTIIY LM108, LM108A, LM208, LM208A, LM308, LM308A e Input Offset Current ... 200 pA Max at 25C for LM108, LM108A, LM208, LM208A @ Input Bias Current ... 2 nA Max at 25C for LM108, LM108A, LM208, LM208A e Supply Current ... 600 pA Max at 25C for LM108, LM108A, LM208, LM208A Input Offset Voltage ... 500 pV Max at 25C for LM108A, LM208A, LM308A e Offset Voltage Temperature Coefficient ... 5 pV/C Max for LM108A, LM208A, LM308A e Supply Voltage Range ... t2Vto 18V @ Applications: Integrators ~ Transducer Amplifiers - Analog Memories ~- Light Meters e Designed To Be Interchangeable With National LM108 Series and Linear Technology LM108 Series description The LM108 series of precision operational amplifiers is particularly well-suited for high- source-impedance applications requiring low input offset and bias currents as well as low power dissipation. Unlike FET input amplifiers, symbol OPERATIONAL AMPLIFIERS 02808, OCTOBER 1983 - REVISED FEBRUARY 1991 "T 9-Ole-10 compi [1 U ef] comez N-[j2 71) Voc IN+E]3 = sf] OUT Voo-G4___ Sf} nc D, JG, OR P PACKAGE (TOP VIEW) L PACKAGE (TOP VIEW) COMP2 NC No internal connection Pin 4 (L package) is in electrical contact with the case. OUT COMP2 COMP1 the input offset and bias currents of the LM108 series do not vary significantly with temperature. Advanced design, processing, and testing techniques make this series a superior choice over previous devices. For applications requiring higher performance, see the LT1008 and LT1012. The LM108 and LM108A are characterized for operation over the full military temperature range of 55C to 125C. The LM208 and LM208A are characterized for operation from 40C to 105C. The LM308 and LM308A are characterized for operation from 0C to 70C. AVAILABLE OPTIONS Vio mex PACKAGE TA so aeeg | SMALL OUTLINE | CERAMIC DIP | METAL CAN | PLASTIC DIP {D) (JG) (L) (P) oe 05mv LMSOBAD LM08AP O to 70C Fev LMG08D _ _imaoap ~~ [0.5mV LM208AD _ __1m208aP ~ 40C to 105C Fay LM208D LM208P _. 05 mV LM108AD LM10BAJG | LM108AL_| LMi08AP ~ 55C to 125C Fy LM108D ~ LM10BJG LMi08L LM108P The D package is available taped and reeled. Add the suffix R to the device type (e.g., LM308ADR). PRODUCTION DATA documents contain inlormation current as of publication date. Products conform to apecificatians per the terms of Texas P 1g does not necessarily include testing of all parameters. : Texas INSTRUMENTS POST OFFICE 80X 655303 - DALLAS, TEXAS 75265. Copyright 1991,. Texas Instruments Incorporated On products compliant to MIL-STD-883, Class 8, all parameters are tested ualess otherwise noted. On all other products, production processing does not necessarily include testing af all parameters. 2-23TEXAS INSTR CLIN/INTFC) LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS SOE D MM 8561724 OO64lee lhe MBTIIY T-79 -00-10 schematic COMP1 COMP2 of % Voc+ 20k 520k F10K $10K [oro a att 35. OUT IN- IN+ Vec- All resistor values shown are nominal and in ohms. absolute maximum ratings over operating free-air temperature range (unless otherwise noted) NOTES: 1. Supply voltage, Voc, (see Note 1): LM108, LM108A, LM208, LM208A ................. eee eee 20V : LM308, LM308A 20... cee eee re ene eens ig V Supply voltage, Voc_ (see Note 1): LM108, LM108A, LM208, LM208A ...................--- -20 V LM308, LM308A ... 2... ee eee eee -18-V Input voltage range, V) (see Note 2). 0.0... eee eect tenet ees +15 V Differential input current (see Notes 3 and 4) 20.20... cece eee +10 MA Duration of output short-circuit at (or below) 25C (see Note 5)... 0... ccc cee eee unlimited Operating free-air temperature range, Ta: LM108, LM108A 56C to 125C LM208, LM208A -40C to 105C LM308, LM308A .............. 2.0. c eee eee 0C to 70C Storage temperature range ... 2.6. cee eee eee ene e bee eeee -65C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or P package .............. 260C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: JG or L package.............. 300C All voltage values, unless otherwise noted, are with respect to the midpoint between Voc, and Voc_.- 2. The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 V, whichever is less. 3. The inputs are shunted with two opposite-facing base-emitter diodes for over-voltage protection. Therefore, excessive current will flow if a differential input voltage in excess.of approximately 1 Vis applied between the inputs unless some limiting resistance is used. 4. Differential voltages are at the noninverting input terminal with respect to the inverting input terminal. 5. The output may be shorted to ground or either power supply. 2-24 Exas INSTRUMENTS POST OFFICE BOX 655303 DALLAS, TEXAS 75265SOE D MM 8961724 0084123 OTF MTIIY LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS 1-77-0670 TEXAS INSTR (LIN/INTFC) recommended operating conditions LM108, LM108A LM208, LM208A LM308, LM308A UNIT MIN NOM MAX MIN NOM MAX | MIN NOM MAX Supply voltage, Voc, 5 20 5 20 5 20 Vv Supply voltage, Voc- -5 - 20 -5 - 20 -5 -20 Vv Operating free-air temperature, Tp -55 125 ~40 85 0 70 C electrical characteristics at specified free-alr temperature, Vo+ = 5Vto + 20V (unless otherwise noted) LM103A, LM208A LM108, LM208 PARAMETER t = = TEST CONDITIONS Ta MIN TYP MAX iN TYP MAX UNIT 26C 03 0.6 0.7 2 Vv Input offset volta: = 10 Input offset voltage Rg = 509 Full range 1 3 mv Temperature coefficient . . 7 vio of input offset voltage Full range ' s 38 Bvi"C 25C 0.05 0.2 0.05 0.2 | Input offset t 1O Input offset curren Full range 04 04 nA Temperature coefficient . . 10 of input offset current Full range 05 25 o5 2.5 parc 26C 0.5 2 05 2 | | bi t IB Input bias curren Full range 3 3 nA Common-mode input VicR voltage range Voct = t15V Fullrange | +13.5 135 v Maximum peak output Voci = 18 V, : Vom voltage ewing R, = 10ka Full range 13 13 Vv A Large-signal differential | Voos = +15 V, 26C 80 300 50 300 Vim VD voltage amplification | Vg = +10 V, Ry 2 10ka | Fullrange 40 25 hi Input resistance 25C ~ 30 70 30 70 MQ Common-mode M CMRR rejection ratio Full range 96 85 dB Supply-voltage rejection ksva ratio (AVos./ AVig) Full range 96 80 dB 1 Supply current 25C 03 0.6 03 06 mA Le P 105C, 125C 0.4 0.4 *On products compliant to MIL-STD-883, Class B, these parameters are not production tested. Full range is 40C to 105C for the LM208 and LM208A and 55C to 125C for the LM108 and LM108A. TEXAS uy INSTRUMENTS 2-25 POST OFFICE BOX 655303 DALLAS, TEXAS 75265SOE D MM 46961724 0084124 T35 METIIY 7-79-01 (O TEXAS INSTR (CLIN/INTFC) LM308, LMSO8A OPERATIONAL AMPLIFIERS electrical characteristics at specifled free-air temperature, Voc4 = +5Vto t 15 V (unlessotherwise noted) LMS0SA LM308 PARAMETER TEST CONDITIONS t Ta MIN TYP MAX MIN TYP MAX UNIT 25C 0.3 0.5 2 75 v input offset volta, Rg = 502 lo npure ad 8 Full range 0.73 10 mv Temperature coefficient Full 2 5 6 301 pwec VIO of input offset voltage uN range # 25C 0.2 1 0.2 1 | Input offset current 0 p Full range 1s 1.6 nA Temperature coefficient Full 2 10 2 10 10 of input offset current wh range f . 25C 1.5 7 1.6 7 { Input b rent iB Input bias current Full range 10 10 nA Common-mode input : VICR voltage range Voce = t18V Full range tt4 +14 Vv Maximum peak output Vocs = 15 V, Vv OM voltage swing RL = 10ka Full range +13 13 v A Large-signat differential | Vog4 = +15 V, 25C 80 300 25 300 Vim VO voltage amplification | Vo =+10V, Ry, 210k | Fullrange | 60 15 m ij input resistance 25C 10 40 10 40 MQ Common-mode CMRR rejection ratio Full range 96 80 dB . Supply-voltage rejection KSVR tatio (Voce! AVio) Full range 96 80 dB loc Supply current 25C 03 08 03 08 mA tFull range is OC to 70C. 2-26 Exas INSTRUMENTS POST OFFICE BOX 655303 = DALLAS, TEXAS 75265LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS TEXAS INSTR (LIN/INTFC) SOE D MM 4961724 00864125 971 METII4 TYPICAL CHARACTERISTICSt EQUIVALENT INPUT OFFSET VOLTAGE vs MATCHED SOURCE RESISTANCE 100 Voces = 18 40} Ta = 25C -~ = = =~ Vio Input Offset Voltage - mV 2S & Q.1 041 0.4 1 4 10 40 100 Rg Source Resistance MQ. Figure 1 M108, LM108A, LM208, LM208A INPUT BIAS and OFFSET CURRENTS vs FREE-AIR TEMPERATURE 2 Voc; = 15V m on Input Blas Current - nA S a = o <q 015 Bos g j 3 oos 2 5 Zz oo & -55 -35 -15 5 25 45 65 85 105 125 Ta Free-Alr Temperature C Figure 3 7-797-Ole-10 TEMPERATURE COEFFICIENT OF EQUIVALENT INPUT OFFSET VOLTAGE _ VS MATCHED SOURCE RESISTANCE 1000 Vecs = 15V 400[- Ta = MIN to 100 40 10 4 FL108A, LM208A ayio Temperature Coefficient ~ pV/C 0.1 a4 1 4 10 40 =: 100 Rg Source Resistance MQ Figure 2 SUPPLY CURRENT VS SUPPLY VOLTAGE Ta = -55C & 3S Ta = 25C Ta = 125C 8 3 loc Supply Current pA $ 6 = o o 0 +5 75 10 2125 15 175 +20 Vecz Supply Voltage ~ V Figure 4 tData at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices. TEXAS Ww INSTRUMENTS POST OFFICE BOX 655303 DALLAS, TEXAS 75265 2-27TEXAS INSTR (LIN/INTFC) SOE D MM 4961724 OO0641eb 608 METIIY LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS | 7-79 -O6-(0 TYPICAL CHARACTERISTICSt MAXIMUM PEAK OUTPUT VOLTAGE SWING _ . MAXIMUM PEAK OUTPUT VOLTAGE SWING vs . vs FREQUENCY OUTPUT CURRENT > 16 . > 15 1 Vecs = 15 Ta = -55C Bau Ta = 25C P See Figure 13 & t125 Ae OSC 12 & Ta = 125C $ +10 g +10 3 Es 6 +8 6 #75 % Cr= 30pF\ C= 3 pF * . a +6 & +5 3 . s os a = = +25 1 2 ' = = & 3 S 0 Voos = +15 1k 10k 100 k 1M O 41 42 3 +4 5 6 7 8 +9 f Frequency - Hz , Ig - Output Current - mA Figure5 Figure 6 , DIFFERENTIAL VOLTAGE AMPLIFICATION DIFFERENTIAL VOLTAGE AMPLIFICATION and PHASE DELAY - VS vs _ SUPPLY VOLTAGE FREQUENCY 420 120 195 3 S ol 3 ! | 3 Ff] = 3p f= 3p Z 115 p 1007 STON 5 i 165 8 , 3 go} Avo N\ N\ Cy = 100 pF; 138 %& 110}Tp = 25 Lean 3 NON . ge 1 Lars _ IN \ Cy = 30 pF z % Ta = -55C : 60 STN os 8 Z 108 3 NM SS PHASE : $ Ta = 125C > 40 S[- DELAY {75 = 3 L_ 3 N : = 100 4 =z IN \ * 2 45 = XY 95 ' 0 | Vocs = a A : 15 2 2 Ta = 25C Cy = 100 pF, < < See Figure 13 Cf = 30 pF 90 ~20 o ! 5 475 10 125 415 +175 +20 1 10 100 1k 610k 100k 1M 10M Vocs Supply Voltage - V f ~ Frequency - Hz Figure 7 Figure 8 Data at high and low temperatures are applicable only within the rated Operating free-air temperature ranges of the various devices. TEXAS wy INSTRUMENTS 2-28 POST OFFICE BOX 655903 - DALLAS, TEXAS 75265TEXAS INSTR (LIN/INTFC) SOE D MM 8961724 O0841e7 744 METITY LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS l- 77-00% TYPICAL CHARACTERISTICS SUPPLY VOLTAGE REJECTION RATIO CLOSED-LOOP OUTPUT IMPEDANCE vs vs FREQUENCY FREQUENCY 120 1 1000 : I Positive suppLy Voce = 15V Ay = 1000 a 100 4 Ay=1 Joo. Cy = 30 Al Ta = 25C 100 LA L See Figure 13 y Av = 1 a Cys or a 3c NS : & a 000 =1 5 80 RZIKKA 8 / 0 / = 30 pF & 5 60 J 3 10 7 & SZIAN Cy = 100 pF s 40 N f-1 s 8 74 N ge 1 7 2 NEGATIVE SUPPLY \_ L 5 20 t << 3 ; 30 BV Poa / Voce = 15 V te 0 Cy = 30 pF = . fo Ig = +1 mA 5 A Ta = 25C See Figure 13 -20 0.01 i ; 100 1k 10k 100 k 1M 10M 10 100 tk 10k 100k 1M 10M f - Frequency Hz f = Frequency - Hz Figure 9 Figure 10 EQUIVALENT INPUT NOISE VOLTAGE VS VOLTAGE FOLLOWER FREQUENCY PULSE RESPONSE 1000 Ez Voct = 15 Vecs 2 t15V > Ta = 28C Cy = 30 pF {400 > Ta = 25C s ' z g 2 3 INPUT | 3 s I 2 100 2 3 a OUTPUT = 3 : 5 i ; a S o w ' < > -10 10 100 1k 10k 100k 0 20 40 60 80 100.120 140 160 180 f Frequency - Hz ; t - Time - ps Figure 11 Figure 12 INSTRUMENTS _POST OFFICE BOX 655303 + DALLAS, TEXAS 75265. 2-29TEXAS INSTR (CLIN/INTFC) SOE D MM 6961724 0084128 680 MBTIIY LM108, LM108A, LM208, LM208A, LM308, LM308A _ OPERATIONAL AMPLIFIERS . 7-7 G- 04-10 APPLICATION INFORMATION frequency compensation Figure 13 shows the frequency compensation circuits for standard compensation, alternate compensation, and feed-forward compensation. The alternate compensation circuit improves supply voltage rejection by a factor of ten. c2 5 pF IL IN- IN- WW R1 10 kQ In- IN+ IN+ 100 pF [ T (eee Note B) = 500 pF io pF (a) STANDARD (b) ALTERNATE (c) FEEO-FORWARD NOTES: A. Cy 2 AICG ARI + 2), Co = 30 pF, bandwidth and slew rate are proportional to TCs. B. Bandwidth and slew rate are proportional to 1/C,. : (see Note A) : Figure 13. Frequency Compensation Circuits Input guarding . cc Input guarding is used to reduce surface leakage . | (see Figure 14). Both sides of the board must be . guarded. Bulk leakage reduction is less than OUT ae, 74, surface leakage reduction and depends on the 6 guard-ring width. The guard ring is connected to a NC O5 low-impedance point at the same potential as the . sensitive input leads. Connections for various Op- V4 amp configurations are shown in Figure 15. Vec- IN RY / Re Figure 14. input Guarding Rt Re aN fan + OUT OUT iN SLei08 IN Luis (a) INVERTING . (b) FOLLOWER , (c) NONINVERTING Figure 15. Guard Ring Connections for Various Op Amp Configurations Texas | INSTRUMENTS 2-30 POST OFFICE BOX 655303 = DALLAS, TEXAS 75265LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS SOE D M@@ 8961724 0084129 517 MTII4 input protection 7- 77-Ole 10 Current is limited by R2 even when the input is connected to a voltage source outside the common-mode range [see Figure 16(a)]. If one supply reverses, current is controlled by R1. These resistors do not affect normal operation. The input resistor controls the current when the input exceeds the supply voltages, when the power for the op amp is turned off, or when the output is shorted [see Figure 16(b)]. 3 IN #8 2R2 7 10kQ TEXAS INSTR (LIN/INTFC) APPLICATION INFORMATION > OUT Af Luts : mt RI 10 kQ IN 10 kQ >- OUT L108 (a) CURRENT LIMITED BY R1 OR R2 (b}) CURRENT LIMITED BY R1 Figure 16. Input Protection input offset voltage testing The test circuit for input offset voltage is shown in Figure 17. This circuit is also used as the bum-in configuration with supply voltages equal to +20 V,R1 = R3 = 10kQ,R2 = 2000, AV = 100. RI 50 KO > By R2y Vo = 1000 V 10003 314 7 Vo = 0 R33 -158V 50 kQF NOTE A: Resistors must have low thermoelectric potential. Figure 17. Test Circuit for input Offset Voltage TEXAS ye INSTRUMENTS | es POST OFFICE BOX 655303 DALLAS, TEXAS 75265LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS TEXAS INSTR (LIN/INTFC) SOE D MM 8561724 0084130 239 MBTIIY 7-77-06-l0 APPLICATION INFORMATION R2 100 kQ Voo+ . ai Q2 . RESET IN Ra t+ 20MQ tone Ng THF Veos c 4 LMi08 |, fa oor r 30 pF aby 100 ka 1 Ri 2N 8 6 c3 100 kQ > OUT 30 pF "L108 t | took 3R2 SMa NOTE A: Q1 and Q3 should not have intemal gate-protection diodes. Figure 18. Low-Drift Integrator With Reset Ri R2 R3 2MQ 2MQ 505 woke 1% .R4 L Tt pF NOTE A: R2 > Rt, R2 >> R3, = R2(R3 + R4)/R1R3. Figure 20. Inverting Amplifier With High input Resistance NOTES: A Teflon, polyethylene, or polycarbonate dielectric capacitor. B. Worst-case drift is less than 2.5 mV/s. . Figure 22. Sample-and-Hold Amplifier NOTE A: Rt = R2R3(R2 + 3). Figure 19. Amplifier for Bridge Transducers = TRANS R | F TRANSDUCE Figure 21. Amplifier for Plezoelectric Transducers NOTE A: Ig = (R3)VYRIRS R3 = R4+R5 Ri = R2 Figure 23. Silateral Current Source EXAS Wy INSTRUMENTS 2-32 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 !LM108, LM108A, LM208, LM208A, LM308, LM308A OPERATIONAL AMPLIFIERS TEXAS INSTR CLIN/INTFC) SOE D MM 8961724 0084131 175 MMTIIY APPLICATION INFORMATION - 79-Olo1O Rt 5MQ on 1% 4 8b vg = 10 VA $1 g LM108 R2 c1 5MQ [ pF 1% = = NOTE A: Ri = R4,R2 = R3,Ay = 1+ AUR2 Figure 24. Amplifier for Photodiode * Figure 25. Differential-Input Instrumentation Sensor : Amplifier cs (see Note A) tt R INve Rig Cl cat. 150 kQ 7 9.002 pF 0.002 pF W q 2 R2 Li08 6 | 1 MQ 3h4 C2 300 pF A. C5 = 6x 107 Ry B. Power bandwidth = 250 kHz C. Small-signal bandwidth = 3.5 MHz D. Slew Rate = 10 V/ps . The LM101 increases speed, raises high- and low-frequency gain, increases output drive capability, and eliminates thermal feedback. Figure 26. Fast Summing Amplifier Exas INSTRUMENTS POST OFFICE BOX 655903 DALLAS, TEXAS 75265 2-33