LH0042 Low Cost FET Op Amp General Description The LH0042 is a FET input operational amplifier with very high input impedance and low input currents with no compromise in noise, common mode rejection ratio, open loop gain, or slew rate. The LH0042 is internally compensated and is free of latch-up. The LH0042 is specified for operation over the b55§ C to a 125§ C military temperature range. The LH0042C is specified for operation over the b25§ C to a 85§ C temperature range. The LH0042 op amp is intended to fulfill a wide variety of applications for process control, medical instrumentation, and other systems requiring very low input currents. The LH0042 provides low cost high performance for such applications as electrometer and photocell amplification, picoammeters, and high input impedance buffers. Features Y Y Y High open loop gainÐ100 dB typ Internal compensation Pin compatible with standard IC op amps (TO-99 package) Connection Diagram Metal Can Package TL/K/5557 – 3 Top View Order Number LH0042H-MIL, LH0042H or LH0042CH See NS Package Number H08D C1995 National Semiconductor Corporation TL/K/5557 RRD-B30M115/Printed in U. S. A. LH0042 Low Cost FET Op Amp February 1995 Absolute Maximum Ratings Short Circuit Duration If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage g 22V Power Dissipation (see Graph) Input Voltage (Note 1) Differential Input Voltage (Note 2) Voltage Between Offset Null and Vb Continuous Operating Temperature Range LH0022, LH0042, LH0052 LH0022C, LH0042C, LH0052C 500 mW g 15V g 30V g 0.5V b 55§ C to a 125§ C b 25§ C to a 85§ C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) b 65§ C to a 150§ C 300§ C DC Electrical Characteristics for LH0022/LH0022C (Note 3) TA e TJ(Max) Limits Parameter Conditions LH0022 Min Input Offset Voltage RS s 100 kX, TA e 25§ C VS e g 15V Typ Max 2.0 4.0 RS s 100 kX, VS e g 15V Temperature Coefficient of Input Offset Voltage 10 TA e 25§ C (Note 4) 0.2 Units Typ Max 3.5 6.0 mV 7.0 mV 15 3 Temperature Coefficient of Input Offset Current mV/§ C 4 pA 2.0 0.5 nA Doubles Every 10§ C Doubles Every 10§ C 0.1 0.1 TA e 25§ C (Note 4) 5 2.0 1.0 mV/week 5.0 Offset Current Drift with Time Input Bias Current Min 5.0 RS s 100 kX Offset Voltage Drift with Time Input Offset Current LH0022C pA 10 2.5 nA Doubles Every 10§ C Doubles Every 10§ C Differential Input Resistance 1012 1012 Common Mode Input Resistance 1012 1012 X 4.0 4.0 pF Input Capacitance 10 pA/week 25 Temperature Coefficient of Input Bias Current 10 X Input Voltage Range VS e g 15V g 12 g 13.5 g 12 g 13.5 V Common Mode Rejection Ratio RS s 10 kX, VIN e g 10V 74 90 70 90 dB Supply Voltage Rejection Ratio RS s 10 kX, g 5V s VS s g 15V 74 90 70 90 dB Large Signal Voltage Gain RL e 2 kX, VOUT e g 10V TA e 25§ C, VS e g 15V 75 100 75 100 V/mV RL e 2 kX, VOUT e g 10V VS e g 15V 30 Output Voltage Swing Output Current Swing RL e 1 kX, TA e 25§ C VS e g 15V g 10 RL e 2 kX, VS e g 15V g 10 VOUT e g 10V, TA e 25§ C g 10 30 g 12.5 g 10 V/mV g 12 V g 15 mA g 10 g 15 g 10 V Output Resistance 75 75 X Output Short Circuit Current 25 25 mA Supply Current VS e g 15V Power Consumption VS e g 15V 2.0 2.5 75 2 2.4 2.8 mA 85 mW DC Electrical Characteristics for LH0042/LH0042C (Note 3) Limits Parameter Conditions LH0042 Min LH0042C Typ Max 20 Min Units Typ Max 6.0 20 Input Offset Voltage RS s 100 kX 5.0 Temperature Coefficient of Input Offset Voltage RS s 100 kX 10 Input Offset Current TA e 25§ C (Note 4) 1.0 5.0 2.0 10 pA Input Bias Current TA e 25§ C (Note 4) 10 25 15 50 pA Offset Voltage Drift with Time 15 7.0 Temperature Coefficient of Input Bias Current mV/§ C 10 Doubles Every 10§ C mV mV/week Doubles Every 10§ C Differential Input Resistance 1012 1012 Common Mode Input Resistance 1012 1012 X 4.0 4.0 pF g 13.5 V Input Capacitance Input Voltage Range g 12 g 13.5 g 12 X Common Mode Rejection Ratio RS s 10 kX, VIN e g 10V 70 86 70 80 dB Supply Voltage Rejection Ratio RS s 10 kX, g 5V s VS s g 15V 70 86 70 86 dB Large Signal Voltage Gain RS s 2 kX, VOUT e g 10V, TA e 25§ C 50 100 25 100 V/mV g 12.5 g 10 RS s 2 kX, VOUT e g 10V Output Voltage Swing Output Current Swing 30 RL e 1 kX, TA e 25§ C g 10 RL e 2 kX g 10 VOUT e g 10V g 10 25 V/mV g 12 V g 15 mA g 10 g 15 g 10 V Output Resistance 75 75 X Output Short Circuit Current 20 20 mA Supply Current VS e g 15V Power Consumption VS e g 15V 2.5 3.5 105 3 2.8 4.0 mA 120 mW DC Electrical Characteristics for LH0052/LH0052C (Note 3) (Continued) Limits Parameter Conditions LH0052 Min Input Bias Current TA e 25§ C (Note 4) Typ LH0052C Max 0.5 Min 2.5 Max 1.0 5.0 pA 0.5 nA 2.5 Temperature Coefficient of Input Bias Current Doubles Every 10§ C Units Typ Doubles Every 10§ C Differential Input Resistance 1012 1012 Common Mode Input Resistance 1012 1012 X 4.0 4.0 pF Input Capacitance X Input Voltage Range VS e g 15V g 12 g 13.5 g 12 g 13.5 V Common Mode Rejection Ratio RS s 10 kX, VIN e g 10V 74 90 70 90 dB Supply Voltage Rejection Ratio RS s 10 kX, g 5V s VS s g 15V 74 90 70 90 dB Large Signal Voltage Gain RL e 2 kX, VOUT e g 10V VS e g 15V, TA e 25§ C 75 100 75 100 V/mV RL e 2 kX, VOUT e g 10V VS e g 15V 30 Output Voltage Swing Output Current Swing RL e 1 kX, TA e 25§ C VS e g 15V g 10 RL e 2 kX, VS e g 15V g 10 VOUT e g 10V, TA e 25§ C g 10 30 g 12.5 g 10 V/mV g 12 V g 15 mA g 10 g 15 g 10 V Output Resistance 75 75 X Output Short Circuit Current 25 25 mA Supply Current VS e g 15V Power Consumption VS e g 15V 3.0 3.5 3.0 105 3.8 mA 114 mW AC Electrical Characteristics for all amplifiers (TA e 25§ C, VS e g 15V) Limits Parameter Conditions Slew Rate Voltage Follower Large Signal Bandwidth Voltage Follower LH0022/42/52 Min Typ 1.5 3.0 LH0022C/42C/52C Max Min Typ 1.0 3.0 Units Max V/ms 40 40 kHz Small Signal Bandwidth 1.0 1.0 MHz Rise Time 0.3 1.5 10 30 Overshoot Settling Time (0.1%) Overload Recovery DVIN e 10V 0.3 1.5 15 40 ms % 4.5 4.5 ms 4.0 4.0 ms 4 AC Electrical Characteristics for all amplifiers (TA e 25§ C, VS e g 15V) (Continued) Limits Parameter Conditions LH0042 Min Input Noise Voltage Typ LH0042C Max Min Typ Units Max RS e 10 kX, fo e 10 Hz 150 150 nV/ SHz RS e 10 kX, fo e 100 Hz 55 55 nV/ SHz RS e 10 kX, fo e 1 kHz 35 35 nV/ SHz RS e 10 kX, fo e 10 kHz 30 30 nV/ SHz BW e 10 Hz to 10kHz, RS e 10 kX 12 12 mVrms Note 1: For supply voltages less than g 15V, the absolute maximum input voltage is equal to the supply voltage. Note 2: Rating applies for minimum source resistance of 10 kX, for source resistances less than 10 kX, maximum differential input voltage is g 5V. Note 3: Unless otherwise specified, these specifications apply for g 5V s VS s g 20V and b 55§ C s TA s a 125§ C for the LH0042 and b 25§ C s TA s a 85§ C for the LH0042C. Typical values are given for TA e 25§ C. Note 4: Input currents are a strong function of temperature. Due to high speed testing they are specified at a junction temperature Tj e 25§ C. Self heating will cause an increase in current in manual tests. 25§ C spec is guaranteed by testing at 125§ C. Note 5: See RETS0042X for the LH0042H military specifications. Auxiliary Circuits (Shown for TO-99 pin out) Offset Null Protecting Inputs from g 150V Transients Note: All diodes are ultra low leakage. TL/K/5557 – 5 TL/K/5557 – 6 Boosting Output Drive to g 100 mA TL/K/5557 – 7 5 TL/K/5557 – 1 Schematic Diagram 6 Typical Applications Precision Voltage Comparator TL/K/5557 – 9 Subtractor for Automatic Test Gear TL/K/5557 – 11 eOUT e 10 c (eIN1 b eIN2) Sensitive Low Cost ‘‘VTVM’’ TL/K/5777 – 12 7 Typical Applications (Continued) Ultra Low Level Current Source TL/K/5777 – 13 Sample and Hold *Polystyrene dielectric. TL/K/5557 – 16 Re-Zeroing Amplifier C1Ð0.01 mF polystyrene. 8 TL/K/5557 – 17 Typical Performance Characteristics Maximum Power Dissipation Input Offset Current vs Temperature Input Bias Current vs Temperature Input Offset Voltage vs Temperature Offset Error (without VOS Null) Total Input Noise Voltage* vs Source Resistance Total Input Noise Voltage* vs Frequency Common Mode Input Voltage vs Supply Voltage Stabilization Time of Input Offset Voltage from Power Turn-On Change in Input Offset Voltage Due to Thermal Shock vs Time TL/K/5557 – 18 *Noise voltage includes contribution from source resistance. 9 Typical Performance Characteristics (Continued) Supply Voltage vs Supply Current Voltage Gain Output Swing vs Supply Voltage Output Voltage Swing vs Load Resistance Current Limiting Output Voltage Swing vs Frequency Voltage Follower Large Signal Response Transient Response Frequency Characteristics vs Ambient Temperature Frequency Characteristics vs Supply Voltage Output Resistance vs Frequency Open Loop Transfer Characteristics vs Frequency TL/K/5557 – 19 10 11 LH0042 Low Cost FET Op Amp Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number H0042H-MIL, LH0042H or LH0042CH NS Package Number H08D 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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