LP124/LP2902/LP324 Micropower Quad Operational Amplifier General Description Features The LP124 series consists of four independent, high gain internally compensated micropower operational amplifiers. These amplifiers are specially suited for operation in battery systems while maintaining good input specifications, and extremely low supply current drain. In addition, the LP124 has an input common mode range, and output source range which includes ground, making it ideal in single supply applications. These amplifiers are ideal in applications which include portable instrumentation, battery backup equipment, and other circuits which require good DC performance and low supply current. Y Connection Diagram Y Y Y Y Y Y Y Low supply current Low offset voltage Low input bias current Input common mode to GND Interfaces to CMOS logic Wide supply range Small Outline Package available Pin-for-pin compatible with LM124 125 mA (max) 2 mV (max) 4 nA (max) 3V k V a k 32V Simplified Schematic Dual-in-Line (J, N) and SO (M) TL/H/8562–1 Order Number LP124J or LP324J See NS Package Number J14A Order Number LP324M or LP2902M See NS Package Number M14A TL/H/8562 – 2 Order Number LP324N or LP2902N See NS Package Number N14A C1996 National Semiconductor Corporation TL/H/8562 RRD-B30M56/Printed in U. S. A. http://www.national.com LP124/LP2902/LP324 Micropower Quad Operational Amplifier February 1995 Absolute Maximum Ratings Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage LP2902 Power Dissipation (Note 3) Tj Max 32V or g 16V 26V or g 13V 32V 26V Differential Input Voltage LP2902 Input Voltage (Note 1) LP2902 ija Operating Temp. Range Storage Temp. Range Soldering Information (10 sec.) Vapor Phase (60 sec.) Infrared (15 sec.) b 0.3V to 32V b 0.3V to 26V Output Short-Circuit to GND (One Amplifier) (Note 2) V a s 15V and TA e 25§ C ESD Susceptibility (Note 9) Continuous Package N 500 mW J 500 mW M 500 mW 150§ C 150§ C 150§ C 90§ C/W 90§ C/W 140§ C/W (Note 4) (Note 4) (Note 4) b 65§ C s T s 150§ C 300§ C 260§ C 215§ C 220§ C g 500V Electrical Characteristics (Note 5) LP124 Symbol Parameter Conditions Tested Typ Limit (Note 6) LP2902 (Note 8) Design Limit (Note 7) Tested Typ Limit (Note 6) Design Limit (Note 7) LP324 Tested Typ Limit (Note 6) Design Limit (Note 7) Units Limits Vos Input Offset Voltage 1 2 4 7 2 4 10 2 4 9 mV (Max) Ib Input Bias Current 1 4 8 8 2 20 40 2 10 20 nA (Max) Ios Input Offset Current 0.1 1 2 2 0.5 4 8 0.2 2 4 nA (Max) Avol Voltage Gain RL e 10k to GND V a e 30V 100 70 60 60 70 40 30 100 50 40 V/mV (Min) CMRR Common Mode Rej. Ratio V a e 30V 100 0V s Vcm Vcm k V a b 1.5 85 80 75 90 80 75 90 80 75 dB (Min) PSRR Power Supply Rej. Ratio V a e 5V to 30V 100 85 80 75 90 80 75 90 80 75 dB (Min) Is Supply Current RL e % 85 125 150 200 85 150 250 85 150 250 mA (Max) Vo Output Voltage Swing IL e 350 mA to GND. Vcm e 0V 3.6 3.4 3.1 V a b1.9V 3.6 3.4 V a b1.9V 3.6 3.4 V a b1.9V V (Min) 0.7 0.8 1.0 1.0 0.7 0.8 1.0 0.7 0.8 1.0 V (Max) IL e 350 mA to V a Vcm e 0V Iout Output Source Source Current Vo e 3V Vin (diff) e 1V 11 9 4 4 10 7 4 10 7 4 mA (Min) Iout Sink Output Sink Current Vo e 1.5V Vin (diff) e 1V 6 5 4 4 5 4 3 5 4 3 mA (Min) Iout Sink Output Sink Current Vo e 1.5V Vcm e 0V 5 3 0.5 1.5 4 2 1 4 2 1 mA (Min) Isource Output Vin (diff) e 1V Short to GND 20 25 35 35 20 25 35 35 20 25 35 35 mA (Max) http://www.national.com 2 Electrical Characteristics (Note 5) (Continued) LP124 Symbol Parameter Conditions Typ Isink Output Short to V a Vin (diff) e 1V 15 LP2902 (Note 8) LP324 Tested Limit (Note 6) Design Limit (Note 7) Typ Tested Limit (Note 6) Design Limit (Note 7) Typ Tested Limit (Note 6) Design Limit (Note 7) Units Limits 30 40 45 15 30 45 15 30 45 mA (Max) Vos Drift 7 10 10 mV/C§ Ios Drift 5 10 10 pA/C§ Gain Bandwidth Product 100 100 100 KHz Slew Rate 50 50 50 V/mS GBW Sr Note 1: The input voltage is not allowed to go more than b 0.3V below Vb (GND) as this will turn on a parasitic transistor causing large currents to flow through the device. Note 2: Short circuits from the output to GND can cause excessive heating and eventual destruction. The maximum sourcing output current is approximately 30 mA independent of the magnitude of V a . At values of supply voltage in excess of 15 VDC, continuous short-circuit to GND can exceed the power dissipation ratings (particularly at elevated temperatures) and cause eventual destruction. Destructive dissipation can result from simultaneous shorts on all amplifiers. Note 3: For operation at elevated temperatures, these devices must be derated based on a thermal resistance of ija and Tj max. Tj e TA a ijaPD. Note 4: The LP124 may be operated from b 55§ C s TA s a 125§ C. The LP2902 may be operated from b 40§ C s TA s a 85§ C, and the LP324 may be operated from 0§ C s TA s a 70§ C. Note 5: Boldface numbers apply at temperature extremes. All other numbers apply only at TA e Tj e 25§ C, V a e 5V, Vcm e V/2, and RL e 100k connected to GND unless otherwise specified. Note 6: Guaranteed and 100% production tested. Note 7: Guaranteed (but not 100% production tested) over the operating supply voltage range (3.0V to 32V for the LP124, LP324, and 3.0V to 26V for the LP2902), and the common mode range (0V to V a b 1.5V), unless otherwise specified. These limits are not used to calculate outgoing quality levels. Note 8: The LP2902 operating supply range is 3V to 26V, and is not tested above 26V. Note 9: The test circuit used consists of the human body model of 100 pF in series with 1500X. Typical Performance Curves Input Voltage Range Input Current Supply Current Voltage Gain Open Loop Frequency Response Power Supply Rejection Ratio TL/H/8562 – 18 3 http://www.national.com Typical Performance Curves (Continued) Voltage Follower Pulse Response Voltage Follower Pulse Response (Small Signal) Common Mode Rejection Ratio TL/H/8562 – 20 Large Signal Frequency Response Output Characteristics Current Sourcing Output Characteristics Current Sinking Current Limiting TL/H/8562 – 19 Application Hints test socket as an unlimited current surge through the resulting forward diode within the IC could destroy the unit. Large differential input voltages can be easily accommodated and, as input differential voltage protection diodes are not needed, no large input currents result from large differential input voltages. The differential input voltage may be larger than V a without damaging the device. Protection should be provided to prevent the input voltages from going negative more than b0.3 VDC (at 25§ C). An input clamp diode with a resistor to the IC input terminal can be used. The amplifiers have a class B output stage which allows the amplifiers to both source and sink output currents. In applications where crossover distortion is undesirable, a resistor The LP124 series is a micro-power pin-for-pin equivalent to the LM124 op amps. Power supply current, input bias current, and input offset current have all been reduced by a factor of 10 over the LM124. Like its predecessor, the LP124 series op amps can operate on single supply, have true-differential inputs, and remain in the linear mode with an input common-mode voltage of 0 VDC. The pinouts of the package have been designed to simplify PC board layouts. Inverting inputs are adjacent to outputs for all of the amplifiers and the outputs have also been placed at the corners of the package (pins 1, 7, 8, and 14). Precautions should be taken to insure that the power supply for the integrated circuit never becomes reversed in polarity or the unit is not inadvertently installed backwards in the http://www.national.com 4 Application Hints (Continued) should be used from the output of the amplifier to ground. The resistor biases the output into class A operation. The LP124 has improved stability margin for driving capacitive loads. No special precautions are needed to drive loads in the 50 pF to 1000 pF range. It should be noted however that since the power supply current has been reduced by a factor of 10, so also has the slew rate and gain bandwidth product. This reduction can cause reduced performance in AC applications where the LM124 is being replaced by an LP124. Such situations usually occur when the LM124 has been operated near its power bandwidth. Output short circuits either to ground or to the positive power supply should be of short time duration. Units can be destroyed, not as a result of the short circuit current causing metal fusing, but rather due to the large increase in IC chip dissipation which will cause eventual failure due to excessive junction temperatures. For example: If all four amplifiers were simultaneously shorted to ground on a 10V supply the junction temperature would rise by 110§ C. Exceeding the negative common-mode limit on either input will cause a reversal of phase to the output and force the amplifier to the corresponding high or low state. Exceeding the negative common-mode limit on both inputs will force the amplifier output to a high state. Exceeding the positive common-mode limit on a single input will not change the phase of the output. However, if both inputs exceed the limit, the output of the amplifier will be forced to a low state. In neither case does a latch occur since returning the input within the common mode range puts the input stage and thus the amplifier in a normal operating mode. The circuits presented in the section on typical applications emphasize operation on only a single power supply voltage. If complementary power supplies are available, all of the standard op amp circuits can be used. In general, introducing a pseudo-ground (a bias voltage reference to V a /2) will allow operation above and below this value in single power supply systems. Many application circuits are shown which take advantage of the wide input common-mode voltage range which includes ground. In most cases, input biasing is not required and input voltages which range to ground can easily be accommodated. Driving CMOS Comparator with Hysteresis TL/H/8562 – 3 TL/H/8562 – 6 Non-Inverting Amplifier Adder/Subtractor TL/H/8562 – 4 TL/H/8562 – 7 Unity Gain Buffer Positive Integrator TL/H/8562 – 5 TL/H/8562 – 8 5 http://www.national.com Application Hints (Continued) Differential Integrator Howland Current Pump TL/H/8562–9 TL/H/8562 – 10 m Power Current Source Bridge Current Amplifier TL/H/8562 – 12 TL/H/8562–11 Lowpass Filter TL/H/8562 – 13 1 kHz Bandpass Active Filter TL/H/8562 – 14 http://www.national.com 6 Application Hints (Continued) Band-Reject Filter TL/H/8562 – 15 Pulse Generator TL/H/8562 – 16 Window Comparator TL/H/8562 – 17 7 http://www.national.com http://www.national.com 8 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-in-Line Package (J) Order Number LP124J or LP324J NS Package Number J14A S.O. Package (M) Order Number LP324M or LP2902M NS Package Number M14A 9 http://www.national.com LP124/LP2902/LP324 Micropower Quad Operational Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Lit. Ý 108468 Dual-in-Line Package (N) Order Number LP324N or LP2902N NS Package Number N14A 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. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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