LM308A Precision Operational Amplifier The LM308A operational amplifier provides high input impedance, low input offset and temperature drift, and low noise. These characteristics are made possible by use of a special Super Beta processing technology. This amplifier is particularly useful for applications where high accuracy and low drift performance are essential. In addition high speed performance may be improved by employing feedforward compensation techniques to maximize slew rate without compromising other performance criteria. The LM308A offers extremely low input offset voltage and drift specifications allowing usage in even the most critical applications without external offset nulling. • Operation from a Wide Range of Power Supply Voltages • Low Input Bias and Offset Currents • Low Input Offset Voltage and Guaranteed Offset Voltage Drift Performance • High Input Impedance http://onsemi.com MARKING DIAGRAMS 8 PDIP–8 N SUFFIX CASE 626 8 LM308AN AWL YYWW 1 1 8 SO–8 D SUFFIX CASE 751 8 1 LM308 ALYWA 1 Frequency Compensation R2 Inverting Input Noninverting Input R1 Output R3 + Compen A Cf A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week R2 Compen B Cf ≥ 30 1 1+ Inverting Input Noninverting Input R1 Output R3 + Compen B 100pF PIN CONNECTIONS R2 R1 Standard Compensation Modified Compensation Compen A 1 2 Inputs Input 5.0pF 10k Input 10 k + 500pF CompenA RS > 10k 100k C2* 0.01µF Output CompenB 3.0k 10pF VEE 10pF + Semiconductor Components Industries, LLC, 2000 April, 2000 – Rev. 1 4 Compen B 7 VCC 6 Output 5 NC Compen B 3.0k CompenA CL 75pF to 0.01µF 10pF *C2 > Standard Feedforward Compensation + 8 (Top View) 500 500pF 3 – 5 x 105 pF R2 Feedforward Compensations for Decoupling Load Capacitance 1 ORDERING INFORMATION Device Package Shipping LM308AN PDIP–8 50 Units/Rail LM308AD SO–8 98 Units/Rail LM308ADR2 SO–8 2500 Tape & Reel Publication Order Number: LM308A/D LM308A MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.) Symbol Value Unit Power Supply Voltage VCC, VEE ±18 Vdc Input Voltage (Note 1.) VI ±15 V Input Differential Current (Note 2.) IID ±10 mA Output Short Circuit Duration tSC Indefinite – Operating Ambient Temperature Range TA 0 to +70 °C Storage Temperature Range Tstg –65 to +150 °C Junction Temperature TJ +150 °C Rating 1. For supply voltages less than ±15 V, the maximum input voltage is equal to the supply voltage. 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 1.0 V is applied between the inputs, unless some limiting resistance is used. ELECTRICAL CHARACTERISTICS (Unless otherwise noted these specifications apply for supply voltages of +5.0 V ≤ VCC ≤ +15 V and –5.0 V ≥ VEE ≥ –15 V, TA = +25°C.) Symbol Min Typ Max Unit Input Offset Voltage VIO – 0.3 0.5 mV Input Offset Current IIO – 0.2 1.0 nA Input Bias Current IIB – 1.5 7.0 nA Input Resistance ri 10 40 – MΩ ICC, IEE – ±0.3 ±0.8 mA AVOL 80 300 – V/mV VIO – – 0.73 mV Characteristic Power Supply Currents (VCC = +15 V, VEE = –15 V) Large Signal Voltage Gain (VCC = +15 V, VEE = –15 V, VO = ±10 V, RL ≥ 10 kΩ) The following specifications apply over the operating temperature range. Input Offset Voltage Input Offset Current Average Temperature Coefficient of Input Offset Voltage IIO – – 1.5 nA ∆VIO/∆T – 1.0 5.0 µV/°C ∆IIO/∆T – 2.0 10 pA/°C IIB – – 10 nA AVOL 60 – – V/mV VICR ±14 – – V CMR 96 110 – dB PSR 96 110 – dB VOR ±13 ±14 – V TA (min) ≤ TA ≤ TA (max) Average Temperature Coefficient of Input Offset Current Input Bias Current Large Signal Voltage Gain (VCC +15 V, VEE = –15 V, VO = ±10 V, RL ≥ 10 kΩ) Input Voltage Range (VCC = +15 V, VEE = –15 V) Common Mode Rejection (RS ≤ 50 kΩ) Supply Voltage Rejection (RS ≤ 50 kΩ) Output Voltage Range (VCC = +15 V, VEE = –15 V, RL = 10 kΩ) http://onsemi.com 2 0.25 1.8 1.6 0.20 1.4 IIO 1.2 1.0 0.15 IIB 0.8 0.10 0.6 0.4 0.05 0.2 0 -60 -40 -20 0 20 40 60 80 T, TEMPERATURE (°C) 100 0 120 140 EQUIVALENT INPUT OFFSET VOLTAGE (mV) 2.0 I IO, INPUT OFFSET CURRENT (nA) I IB , INPUT BIAS CURRENT (nA) LM308A 100 10 1.0 0.1 100 k Figure 1. Input Bias and Input Offset Currents IEE , SUPPLY CURRENTS ( µ A) TA = 0°C +25°C -55°C +70°C +125°C 80 0 5.0 10 15 = CF = 0 f = 100 Hz 90 400 TA = -55°C 0°C 300 +25°C 200 +70°C +125°C 100 0 20 0 5.0 15 10 VCC = VEE, SUPPLY VOLTAGES (V) VCC = VEE, SUPPLY VOLTAGES (V) Figure 3. Voltage Gain versus Supply Voltages Figure 4. Power Supply Currents versus Power Supply Voltages 140 VOR, OUTPUT VOLTAGE RANGE (± Vp-p) 100 80 CF = 3.0 pF 60 40 CF = 30 pF 20 0 -20 1.0 20 20 120 AVOL , VOLTAGE GAIN (dB) 500 I CC AVOL , VOLTAGE GAIN (dB) 120 100 100 M Figure 2. Maximum Equivalent Input Offset Voltage Error versus Input Resistance 130 110 1.0 M 10 M ri, INPUT RESISTANCE (Ω) CF = 100 pF 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M VCC = +15 V VEE = -15 V TA = +25°C 16 12 8.0 CF = 3.0 pF 4.0 CF = 30 pF 0 1.0 k f, FREQUENCY (Hz) 10 k 100 k f, FREQUENCY (Hz) Figure 5. Open Loop Frequency Response Figure 6. Large Signal Frequency Response http://onsemi.com 3 1.0 M LM308A SUGGESTED DESIGN APPLICATIONS INPUT GUARDING input pins are adjacent to pins that are at supply potentials. This leakage can be significantly reduced by using guarding to lower the voltage difference between the inputs and adjacent metal runs. The guard, which is a conductive ring surrounding the inputs, is connected to a low–impedance point that is at approximately the same voltage as the inputs. Leakage currents from high voltage pins are then absorbed by the guard. Special care must be taken in the assembly of printed circuit boards to take full advantage of the low input currents of the LM308A amplifier. Boards must be thoroughly cleaned with alcohol and blown dry with compressed air. After cleaning, the boards should be coated with epoxy or silicone rubber to prevent contamination. Even with properly cleaned and coated boards, leakage currents may cause trouble at +125°C, particularly since the C5 (2) RS Input 150k R1 R4 0.002µF 0.002 µF R2 1M LM308A 150pF 1 6 2 3 1.0M Compen B 300pF VCC Output 1.0M Input LM101A(3) or equiv Q1 Sample (1) Power Bandwidth: 250 kHz Small Signal Bandwidth: 3.5 MHz Slew Rate: 10 V/µs (2) C5 = 6 X 10-8 R1 1.0µF (1) 30pF (1) Teflon, Polyethylene or Polycarbonate Dielectric Capacitor Figure 7. Fast (1) Summing Amplifier with Low Input Current Figure 8. Sample and Hold Inverting Amplifier Input Output Q2 (3) In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability and eliminates thermal feedback. R1 Follower R2 Noninverting Amplifier R2 R3 (1) R3 (1) Output Output Input Output R1 R3 (1) C1 C1 (1) Used to compensate for large source resistances. Figure 9. Connection of Input Guards http://onsemi.com 4 C1 Input R1 R2 Note: must be an impedance. R1 +R2 LM308A Representative Circuit Schematic Compensation A Compensation B 3.5k 5.6k VCC 7.5k 15pF 17.4k 17.4k 1.0k 1.4k 7.5k 200 7.0k 1.0k Inputs 2.0k VCC 65 1.0k Output 150 VEE 80k 2.0k 20k 362 10k 1.2k 50k VEE http://onsemi.com 5 LM308A PACKAGE DIMENSIONS PDIP–8 N SUFFIX CASE 626–05 ISSUE K 8 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 5 –B– 1 4 DIM A B C D F G H J K L M N F –A– NOTE 2 L C J –T– MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --10 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --10 0.030 0.040 N SEATING PLANE D M K G H 0.13 (0.005) M T A M B M SO–8 D SUFFIX CASE 751–06 ISSUE T D A 8 E 5 0.25 H 1 M B M 4 h B e X 45 A C SEATING PLANE L 0.10 A1 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. C B 0.25 M C B S A S http://onsemi.com 6 DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0 7 LM308A Notes http://onsemi.com 7 LM308A ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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