Fairchild Semiconductors Linear 1.C.s - Operational Amplifiers Semiconductors LM108, LM108A, LM308A Super Beta Operational Amplifiers GENERAL DESCRIPTION The 108 series of Super Beta Operational Amplifiers is constructed using the Fairchild Planar epitaxial process. High input impedance, low noise, input offsets, and temperature drift are made possible through use of super beta processing, making the device suitable for applications requiring high accuracy and low drift performance. The 108A series is specially selected for extremely low offset voltage and drift, and high common mode rejection, making possible superior performance in applications where - offset nulling is undesirable. ABSOLUTE MAXIMUM RATINGS Supply Voltage 108A, 108 +20 V 308A +18 V Internal Power Dissipation 500 mW Differential Input Current +10 mA Input Voitage +15 V Storage Temperature Range -65C to +150C Operating Temperature Range Military (108A, 108) -55C to +125C Commercial (308A) Lead Temperature (Soldering, 60 seconds) Output Short Circuit Duration 0C to +70C 300C Indefinite CONNECTION DIAGRAM | See outline drawing No. 97 for dimensions. ZO INV nny (s) OUTPUT NON INV INPUT NC Pin 4 connected to case TOP VIEW FEATURES Guaranteed fow input offset characteristics. High input impedance, Low offset current. Low bias current. Operation over wide supply range. REFERENCE TABLE Code Stock No. LM108H 35797D LM108AH 35798B 35799X LM308AH _____.....-_. eeeeeeeeeeeeeeeeeee eee EEeEEE SSE eEeEEEEEeeeeeeeeSSSSSaaaaaSaEaeaeaeaeaEaEaaaaSNmaEEEEEeEeEeEEeEEEE ee PLEASE QUOTE STOCK NO. AND MANUFACTURER'S CODE WHEN ORDERING 755National Semiconductors Semiconductor Linear 1.C.s Operational Amplifiers LM108 Series FEATURES . -_ Maximum input bias current of 3.0nA over Operational Amplifiers temperature (7.0nA for LM308) Offset current less than 400pA over temperature REFERENCE TABLE (1,0nA for LM308) Code Stock No. Supply current of only 3001A, even in saturation Guaranteed drift characteristics LM108H 29365R The low current error of the LM108 series makes LM208H 19678G possible many designs that are not practical with LM308H 19679E conventional amplifiers. In fact, it operates from 40 MQ source resistances, introducing less error than devices like the 709 with 10k2 sources. Integrators with drifts less than 500uV/sec and GENERAL DESCRIPTION . | analog time delays in excess of one hour can be The LM108 Series are precision operational made using capacitors no larger than 1nF. amplifiers having specifications a factor of ten better than FET amplifiers over a 55C to 125C . temperature range. Selected units are available with CONNECTION DIAGRAM offset valtages less than 1.0mV and drifts less than 5uV/C, again over the military temperature range. This makes it possible to eliminate offset adjustments, in most cases, and obtain performance Metal Can approaching chopper stabilised amplifiers. The devices operate with supply voltages from +2V to +20V and have sufficient supply rejection to use + unregulated supplies. Although the circuit is Comp1 (1) (7) v *Pin connections shown on schematic iagram are for Comp2 TO-5 package interchangeable with and uses the same compensation as the LM101A, an alternative compensation scheme can be used to make it (6) Output particularly insensitive to power supply noise and to Q make supply bypass capacitors unnecessary. Inputs Unused pin Note: Pin4 (no internal connected to case connectionjto allow for input anti-leakage guard ring on printed circuit board layout See outline drawing No. 97 for dimensions. COMPENSATION CIRCUITS Standard Compensation Circuit Alternate*Frequency Compensation Rl R2 Vin 2 Vout R3 b-Vout +y, 3 in 8 22RD Cc, Cc Cee RIFR2 Troon improves rejection of power supply f Cz=30pt F noise by a factor of tn PLEASE QUOTE STOCK NO. AND MANUFACTURER'S CODE WHEN ORDERING 967National Semiconductors a . . ope Semiconductor Linear I.C.s - Operational Amplifiers ABSOLUTE MAXIMUM RATINGS Output Short-Circuit Duration Indefinite Supply Voltage +20V (+18 for 7 LM308) - Operating Temperature Range LM108 55C.to 125C Power Dissipation (Note 1) 500mW LM208 25C to 85C LM308 0C to 70C Differential Input Current +10mMA (Note 2) Storage Temperature Range 65C to 150C Input Voltage (Note 3) +15V Lead Temperature (Soldering, 60 sec) 300C ELECTRICAL CHARACTERISTICS (Note 4) LM108/LM208 | LM308 Parameter Conditions Min. Typ. Max.| Min. Typ. Max,| Units input Offset Voitage Ta = 25C 0.7 2.0 20 7.5| mv (Note 5) 02 1 nA Input Offset Current T, = 25C 0.05 0.2 15 7 nA input Bias Current T, = 25C 0.8 2.0 tnput Resistance TT, = 25C 30 70 10 + 40 MQ Supply Current Ta = 25C 03 0.6 0.3 08 | mA Large Signal Voltage Gain | T, = 25C, Vs = +15V Vour = 10V, Ri & 10 kQ 50 300 25 300 Vimv Input Offset Voltage 3.0 10 mV (Note 5) Average Temperature Coefficient of Input 3.0 15 6.0 30 | uVv/c Offset Voltage (Note 5) Input Offset Current 0.4 1.5 1 nA Average Temperature Coefficient of Input Offset Current : 05 25 2.0 10 | pA/c {nput Bias Current 3.0 10 | nA Supply Current Ta = +125C 0.15 0.4 mA Large Signal Voltage Gain | Vs; = +15V, Vour =.10V R_ > 10 kQ 25 16 VimvV Output Voltage Swing Vs = +15V, Ro = 10kQ +13 i414 +13 +14 v Input Voltage Range Vs = t15V +13.5 +14 Vv Common Mode 85 100 80. 100 qB Rejection Ratio Supply Voltage a 80 96 806 dB Rejection Ratio Note 1: The maximum junction temperature of the LM108 is 150C, whilst the LM208 is 100C that of the M308 is 85C, For operating at elevated temperatures, devices in the TO-5 package must be derated based on a thermal resistance of 150C/W, junction to ambient, or 45C/W, junction to case. 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: For the LM108.+5V < Vs < 20V 55C < Ta < 125C For the LM208 +5V < Vs < 20V 25C < T, < 85C For the LM308 +5V < Vs < t15V0C < T, < 70C Note 5: The LM108A has a guaranteed offset voltage less than 0.5mV at 25C and 1.0mV for 55C < Ty < 125C and V, = +15V. The average temperature coefficient of input offset voltage is guaranteed to be less than 5 nV/C for these same conditions. SSS SS MANUFACTURER'S CURRENT LIST PRICES ARE ALWAYS CHARGED