LM748 Operational Amplifier General Description Features The LM748 is a general purpose operational amplifier with external frequency compensation. The unity-gain compensation specified makes the circuit stable for all feedback configurations, even with capacitive loads. It is possible to optimize compensation for best high frequency performance at any gain. As a comparator, the output can be clamped at any desired level to make it compatible with logic circuits. The LM748C is specified for operation over the 0§ C to a 70§ C temperature range. Y Y Y Y Y Y Frequency compensation with a single 30 pF capacitor Operation from g 5V to g 20V Continuous short-circuit protection Operation as a comparator with differential inputs as high as g 30V No latch-up when common mode range is exceeded Same pin configuration as the LM101 Connection Diagram Dual-In-Line Package TL/H/11478 – 2 Top View Order Number LM748CN See NS Package Number N08B C1995 National Semiconductor Corporation TL/H/11478 RRD-B30M115/Printed in U. S. A. LM748 Operational Amplifier November 1994 Absolute Maximum Ratings Input Voltage (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Operating Temperature Range: LM748C g 22V Power Dissipation (Note 1) Differential Input Voltage g 15V Output Short-Circuit Duration (Note 3) 500 mW g 30V 0§ C to a 70C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) b 65§ C to a 150§ C a 300§ C Electrical Characteristics (Note 4) Parameter Conditions Min Typ Max Units 1.0 5.0 mV 40 200 nA 120 500 Input Offset Voltage TA e 25§ C, RS s 10 kX Input Offset Current TA e 25§ C Input Bias Current TA e 25§ C Input Resistance TA e 25§ C Supply Current TA e 25§ C, VS e g 15V Large Signal Voltage Gain TA e 25§ C, VS e g 15V VOUT e g 10V, RL t 2 kX Input Offset Voltage RS s 10 kX Average Temperature Coefficient of Input Offset Voltage RS s 50X 3.0 mV/§ C RS s 10 kX 6.0 mV/§ C Input Offset Current TA e 0§ C to a 70§ C 300 TA e b55§ C to a 125§ C 500 nA TA e 0§ C to a 70§ C 0.8 mA Input Bias Current 300 800 1.8 50 2.8 160 mA V/mV 6.0 TA e b55§ C to a 125§ C Supply Current nA kX mV nA 1.5 mA TA e a 125§ C, VS e g 15V 1.2 2.25 mA TA e b55§ C to a 125§ C 1.9 3.3 mA Large Signal Voltage Gain VS e g 15V, VOUT e g 10V RL t 2 kX Output Voltage Swing VS e g 15V, RL e 10 kX g 12 g 14 g 13 25 V/mV V VS e g 15V, RL e 2 kX g 10 Input Voltage Range VS e g 15V g 12 V Common-Mode Rejection Ratio RS s 10 kX 70 90 dB Supply Voltage Rejection Ratio RS s 10 kX 77 90 dB V Note 1: For operating at elevated temperatures, the device must be derated based on a maximum junction to case thermal resistance of 45§ C per watt, or 150§ C per watt junction to ambient. (See Curves). Note 2: For supply voltages less than g 15V, the absolute maximum input voltage is equal to the supply voltage. Note 3: Continuous short circuit is allowed for case temperatures to a 125§ C and ambient temperatures to a 70§ C. Note 4: These specifications apply for g 5V s VS s a 15V and 0§ C s TA s a 70§ C, unless otherwise specified. 2 Typical Applications Inverting Amplifier with Balancing Circuit Voltage Comparator for Driving DTL or TTL Integrated Circuits TL/H/11478 – 4 ² May be zero or equal to parallel combination of R1 and R2 for minimum offset. TL/H/11478 – 3 Voltage Comparator for Driving RTL Logic or High Current Driver TL/H/11478 – 5 Guaranteed Performance Characteristics (Note 4) Input Voltage Range Output Swing Voltage Gain TL/H/11478 – 6 3 Typical Performance Characteristics Supply Current Voltage Gain Input Bias Current Current Limiting Input Current Maximum Power Dissipation Open Loop Frequency Response Large Signal Frequency Response Voltage Follower Pulse Response TL/H/11478 – 7 4 5 LM748 Operational Amplifier Physical Dimensions inches (millimeters) Dual-In-Line Package (N) Order Number LM748CN NS Package Number N08E 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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