LH0042 Low Cost FET Op Amp

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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

specified for operation over the b25 C toa85 C temperature range February 1995 The LH0042 op amp is intended to fulfill a wide variety of applications for process control medical instrumentation and

1 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 a125 C military temperature range The LH0042C is specified for operation over the b25 C toa85 C temperature range February 1995 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 gain 100 db typ Internal compensation Pin compatible with standard IC op amps (TO-99 package) LH0042 Low Cost FET Op Amp Connection Diagram Metal Can Package TL K 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

2 Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Power Dissipation (see Graph) Input Voltage (Note 1) Differential Input Voltage (Note 2) Voltage Between Offset Null and V b g22v 500 mw g15v g30v g0 5V Short Circuit Duration Operating Temperature Range LH0022 LH0042 LH0052 LH0022C LH0042C LH0052C Storage Temperature Range Lead Temperature (Soldering 10 sec ) Continuous b55 Ctoa125 C b25 Ctoa85 C b65 Ctoa150 C 300 C DC Electrical Characteristics for LH0022 LH0022C (Note 3) T A e T J (Max) Limits Parameter Conditions LH0022 LH0022C Units Min Typ Max Min Typ Max Input Offset Voltage R S s 100 kx T A e25 C V S e g15v mv R S s 100 kx V S e g15v mv Temperature Coefficient of Input Offset Voltage R S s 100 kx mv C Offset Voltage Drift with Time 3 4 mv week Input Offset Current T A e 25 C (Note 4) pa na Temperature Coefficient of Input Offset Current Doubles Every 10 C Doubles Every 10 C Offset Current Drift with Time pa week Input Bias Current T A e 25 C (Note 4) pa na Temperature Coefficient of Input Bias Current Doubles Every 10 C Doubles Every 10 C Differential Input Resistance X Common Mode Input Resistance X Input Capacitance pf Input Voltage Range V S e g15v g12 g13 5 g12 g13 5 V Common Mode Rejection Ratio R S s 10 kx V IN e g10v db Supply Voltage Rejection Ratio R S s 10 kx g5v s V S s g15v db Large Signal Voltage Gain R L e 2kX V OUT e g10v T A e 25 C V S e g15v V mv R L e 2kX V OUT e g10v V S e g15v V mv Output Voltage Swing R L e 1kX T A e25 C V S e g15v g10 g12 5 g10 g12 V R L e 2kX V S e g15v g10 g10 V Output Current Swing V OUT e g10v T A e 25 C g10 g15 g10 g15 ma Output Resistance X Output Short Circuit Current ma Supply Current V S e g15v ma Power Consumption V S e g15v mw 2

3 DC Electrical Characteristics for LH0042 LH0042C (Note 3) Limits Parameter Conditions LH0042 LH0042C Units Min Typ Max Min Typ Max Input Offset Voltage R S s 100 kx mv Temperature Coefficient of Input Offset Voltage R S s 100 kx mv C Offset Voltage Drift with Time mv week Input Offset Current T A e 25 C (Note 4) pa Input Bias Current T A e 25 C (Note 4) pa Temperature Coefficient of Input Bias Current Doubles Every 10 C Doubles Every 10 C Differential Input Resistance X Common Mode Input Resistance X Input Capacitance pf Input Voltage Range g12 g13 5 g12 g13 5 V Common Mode Rejection Ratio R S s 10 kx V IN e g10v db Supply Voltage Rejection Ratio R S s 10 kx g5v s V S s g15v db Large Signal Voltage Gain R S s 2kX V OUT e g10v T A e 25 C V mv R S s 2kX V OUT e g10v V mv Output Voltage Swing R L e 1kX T A e25 C g10 g12 5 g10 g12 V R L e 2kX g10 g10 V Output Current Swing V OUT e g10v g10 g15 g10 g15 ma Output Resistance X Output Short Circuit Current ma Supply Current V S e g15v ma Power Consumption V S e g15v mw 3

4 DC Electrical Characteristics for LH0052 LH0052C (Note 3) (Continued) Limits Parameter Conditions LH0052 LH0052C Units Min Typ Max Min Typ Max Input Bias Current T A e 25 C (Note 4) pa na Temperature Coefficient of Input Bias Current Doubles Every 10 C Doubles Every 10 C Differential Input Resistance X Common Mode Input Resistance X Input Capacitance pf Input Voltage Range V S e g15v g12 g13 5 g12 g13 5 V Common Mode Rejection Ratio R S s 10 kx V IN e g10v db Supply Voltage Rejection Ratio R S s 10 kx g5v s V S s g15v db Large Signal Voltage Gain R L e 2kX V OUT e g10v V S e g15v T A e 25 C V mv R L e 2kX V OUT e g10v V S e g15v V mv Output Voltage Swing R L e 1kX T A e25 C V S e g15v g10 g12 5 g10 g12 V R L e 2kX V S e g15v g10 g10 V Output Current Swing V OUT e g10v T A e 25 C g10 g15 g10 g15 ma Output Resistance X Output Short Circuit Current ma Supply Current V S e g15v ma Power Consumption V S e g15v mw AC Electrical Characteristics for all amplifiers (T A e 25 C V S e g15v) Limits Parameter Conditions LH LH0022C 42C 52C Units Min Typ Max Min Typ Max Slew Rate Voltage Follower V ms Large Signal Bandwidth Voltage Follower khz Small Signal Bandwidth MHz Rise Time ms Overshoot % Settling Time (0 1%) DV IN e 10V ms Overload Recovery ms 4

5 AC Electrical Characteristics for all amplifiers (T A e 25 C V S e g15v) (Continued) Limits Parameter Conditions LH0042 LH0042C Units Min Typ Max Min Typ Max Input Noise Voltage R S e 10 kx f o e10 Hz nv SHz R S e 10 kx f o e100 Hz nv SHz R S e 10 kx f o e1 khz nv SHz R S e 10 kx f o e10 khz nv SHz BW e 10 Hz to 10kHz R S e 10 kx mvrms Note 1 For supply voltages less than g15v 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 g5v Note 3 Unless otherwise specified these specifications apply for g5v s V S s g20v and b55 C s T A s a125 C for the LH0042 and b25 C s T A s a85 C for the LH0042C Typical values are given for T A 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 T j 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 g150v Transients TL K Note All diodes are ultra low leakage TL K Boosting Output Drive to g100 ma TL K

6 Schematic Diagram TL K

7 Typical Applications Precision Voltage Comparator TL K Subtractor for Automatic Test Gear e OUT e 10 c (e IN1 b e IN2 ) TL K Sensitive Low Cost VTVM TL K

8 Typical Applications (Continued) Ultra Low Level Current Source TL K Sample and Hold Polystyrene dielectric TL K Re-Zeroing Amplifier C mf polystyrene TL K

9 Typical Performance Characteristics Maximum Power Dissipation Input Offset Current vs Temperature Input Bias Current vs Temperature Input Offset Voltage vs Temperature Offset Error (without V OS 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 Noise voltage includes contribution from source resistance TL K

10 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

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12 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 2 A critical component is any component of a life systems which (a) are intended for surgical implant support device or system whose failure to perform can into the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectiveness be reasonably expected to result in a significant injury to the user National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd Japan Ltd 1111 West Bardin Road Fax (a49) th Floor Straight Block Tel Arlington TX cnjwge tevm2 nsc com Ocean Centre 5 Canton Rd Fax Tel 1(800) Deutsch Tel (a49) Tsimshatsui Kowloon Fax 1(800) English Tel (a49) Hong Kong Fran ais Tel (a49) Tel (852) Italiano Tel (a49) Fax (852) National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

Features. Y High input impedance 400 kx. Y Low output impedance 6X. Y High power efficiency. Y Low harmonic distortion. Y DC to 30 MHz bandwidth

Features. Y High input impedance 400 kx. Y Low output impedance 6X. Y High power efficiency. Y Low harmonic distortion. Y DC to 30 MHz bandwidth LH0002 Buffer General Description The LH0002 is a general purpose buffer Its features make it ideal to integrate with operational amplifiers inside a closed loop configuration to increase current output