LM102/LM302 Voltage Followers General Description The LM102 series are high-gain operational amplifiers designed specifically for unity-gain voltage follower applications. Built on a single silicon chip, the devices incorporate advanced processing techniques to obtain very low input current and high input impedance. Further, the input transistors are operated at zero collector-base voltage to virtually eliminate high temperature leakage currents. It can therefore be operated in a temperature stabilized component oven to get extremely low input currents and low offset voltage drift. The LM102, which is designed to operate with supply voltages between g 12V and g 15V, also features low input capacitance as well as excellent small signal and large signal frequency responseÐall of which minimize high fre- quency gain error. Because of the low wiring capacitances inherent in monolithic construction, this fast operation can be realized without increasing power consumption. Features Y Y Y Y Y Y Fast slewing Ð 10V/ms Low input current Ð 10 nA (max) High input resistance Ð 10,000 MX No external frequency compensation required Simple offset balancing with optional 1 kX potentiometer Plug-in replacement for both the LM101 and LM709 in voltage follower applications Schematic Diagram TL/H/7753 – 1 C1995 National Semiconductor Corporation TL/H/7753 RRD-B30M115/Printed in U. S. A. LM102/LM302 Voltage Followers November 1994 Absolute Maximum Ratings Operating Free Air Temperature Range b 55§ C to a 125§ C LM102 LM302 0§ C to a 70§ C b 65§ C to a 150§ C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 300§ C ESD rating to be determined. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. (Note 6) g 18V Supply Voltage Power Dissipation (Note 1) Input Voltage (Note 2) Output Short Circuit Duration (Note 3) 500 mW g 15V Indefinite Electrical Characteristics (Note 4) Parameter LM102 Conditions Min Typ LM302 Max Min Type Units Max Input Offset Voltage TA e 25§ C 2 5 5 15 mV Input Bias Current TA e 25§ C 3 10 10 30 nA Input Resistance TA e 25§ C 1010 1012 Input Capacitance 109 3.0 Large Signal Voltage Gain TA e 25§ C, VS g 15V, VOUT e g 10V, RL e 8 kX Output Resistance TA e 25§ C 0.8 Supply Current TA e 25§ C 3.5 0.999 0.9996 Input Offset Voltage 0.9985 1012 X 3.0 pF 0.9995 1.0 2.5 0.8 2.5 X 5.5 3.5 5.5 mA 20 mV 7.5 Offset Voltage Temperature Drift 6 Input Bias Current TA e TAMAX TA e TAMIN Large Signal Voltage Gain VS e g 15V, VOUT e g 10V, RL e 10 kX Output Voltage Swing VS e g 15V, RL e 10 kX (Note 5) Supply Current TA e 125§ C Supply Voltage Rejection Ratio g 12V s VS s g 15V 3 30 20 10 100 3.0 20 V/V mV/§ C 15 50 nA nA 0.999 g 10 g 10 2.6 V 4.0 60 mA 60 dB Note 1: The maximum junction temperature of the LM102 is 150§ C, while that of the LM302 is 85§ C. For operating at elevated temperatures, devices in the H08 package must be derated based on a thermal resistance of 150§ C/W, junction to ambient, or 20§ C/W, junction to case. Note 2: For supply voltages less than g 15V, the absolute maximum input voltage is equal to the supply voltage. Note 3: It is necessary to insert a resistor (at least 5k and preferably 10k) in series with the input pin when the amplifier is driven from low impedance sources to prevent damage when the output is shorted and to ensure stability. Note 4: These specifications apply for g 12V s VS s g 15V and b 55§ C s TA s 125§ C for the LM102 and 0§ C s TA s 70§ C for the LM302 unless otherwise specified. Note 5: Increased output swing under load can be obtained by connecting an external resistor between the booster and V b terminals. See curve. Note 6: Refer to RETS102X for the LM102H military specifications. APPLICATION HINT The input must be driven from a source impedance of typically 10 kX (5 kX Min) to maintain stability. The total source impedance will be reduced at high frequencies if there is stray capacitance at the input pin. In these cases, a 10 kX resistor should be inserted in series with the input, physically close to the input pin to minimize the stray capacitance and prevent oscillation. 2 Guaranteed Performance Characteristics LM102 Input Current Output Swing Supply Current TL/H/7753 – 7 Typical Performance Characteristics LM102 Voltage Gain and Phase Lag Voltage Gain and Phase Lag Output Resistance Positive Output Swing Negative Output Swing Output Swing Large Signal Frequency Response Large Signal Pulse Response Maximum Power Dissipation TL/H/7753 – 8 3 Guaranteed Performance Characteristics LM302 Input Current Output Swing Supply Current TL/H/7753 – 9 Typical Performance Characteristics LM302 Voltage Gain and Phase Lag Voltage Gain and Phase Lag Output Resistance Positive Output Swing Negative Output Swing Output Swing Large Signal Frequency Response Large Signal Pulse Response Maximum Power Dissipation TL/H/7753 – 10 4 Typical Applications Low Pass Active Filter *Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability. TL/H/7753 – 3 Sample and Hold with Offset Adjustment *Polycarbonate-dielectric capacitor. TL/H/7753 – 4 High Pass Active Filter *Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability. TL/H/7753 – 5 High Input Impedance AC Amplifier TL/H/7753 – 6 5 LM102/LM302 Voltage Followers Connection Diagram Metal Can Package Top View TL/H/7753 – 2 Order Number LM102H/883 See NS Package Number H08C Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM102H/883 NS Package Number H08C 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. 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