LF442 NSC | Alldatasheet

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Technical content

Features

n 1/10 supply current of a LM1458: 400 µA (max) n Low input bias current: 50 pA (max) n Low input offset voltage: 1 mV (max) n Low input offset voltage drift: 10 µV/˚C (max) n High gain bandwidth: 1 MHz n High slew rate: 1 V/µs n Low noise voltage for low power: n Low input noise current: n High input impedance: 1012Ω n High gain VO = ±10V, RL = 10k: 50k (min) Typical Connection

Ordering Information

X indicates electrical grade Y indicates temperature range “M” for military “C” for commercial Z indicates package type “H” or “N” Connection Diagrams BI-FET II™ is a trademark of National Semiconductor Corporation. DS009155-1 Metal Can Package DS009155-2 Pin 4 connected to case Top View Order Number LF442AMH or LF442MH or LF442MH/883 See NS Package Number H08A Dual-In-Line Package DS009155-4 Top View Order Number LF442ACN or LF442CN See NS Package Number N08E April 1999 LF442 Dual Low Power JFET Input Operational Amplifier © 1999 National Semiconductor Corporation DS009155 www.national.com

Absolute Maximum Ratings(Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LF442A LF442 Supply Voltage ±22V ±18V Differential Input Voltage ±38V ±30V Input Voltage Range ±19V ±15V (Note 2) Output Short Circuit Continuous Continuous Duration (Note 3) H Package N Package Tjmax 150˚C 115˚C H Package N Package θJA (Typical) (Note 4) (Note 5) 65˚C/W 165˚C/W 114˚C/W 152˚C/W θ JC (Typical) 21˚C/W Operating Temperature (Note 5) (Note 5) Range Temperature Range Lead Temperature 260˚C 260˚C (Soldering, 10 sec.) ESD Tolerance Rating to be determined Symbol Parameter Conditions LF442A LF442 Units Min Typ Max Min Typ Max VOS Input Offset Voltage R S = 10 kΩ ,TA = 25˚C 0.5 1.0 1.0 5.0 mV Over Temperature 7.5 mV ΔVOS /ΔT Average TC of Input R S = 10 kΩ 7 10 7 µV/˚C Offset Voltage IOS Input Offset Current V S = ±15V T j = 25˚C 5 25 5 50 pA (Notes 7, 8) T j = 70˚C 1.5 1.5 nA Tj = 125˚C 10 nA IB Input Bias Current V S = ±15V T j = 25˚C 10 50 10 100 pA (Notes 7, 8) T j = 70˚C 3 3 nA Tj = 125˚C 20 nA R IN Input Resistance T j = 25˚C 10 12 1012 Ω AVOL Large Signal Voltage V S = ±15V, VO = ±10V, 50 200 25 200 V/mV Gain R L = 10 kΩ ,TA = 25˚C Over Temperature 25 200 15 200 V/mV VO Output Voltage Swing V S = ±15V, RL = 10 kΩ ±12 ±13 ±12 ±13 V VCM Input Common-Mode ±16 +18 ±11 +14 V Voltage Range −17 −12 V CMRR Common-Mode R S ≤ 10 kΩ 80 100 70 95 dB Rejection Ratio PSRR Supply Voltage (Note 9) 80 100 70 90 dB Rejection Ratio IS Supply Current 300 400 400 500 µA Symbol Parameter Conditions LF442A LF442 Units Min Typ Max Min Typ Max Amplifier to Amplifier T A = 25˚C, f= 1 Hz-20 kHz −120 −120 dB Coupling (Input Referred) SR Slew Rate V S = ±15V, TA = 25˚C 0.8 1 0.6 1 V/µs GBW Gain-Bandwidth Product V S = ±15V, TA = 25˚C 0.8 1 0.6 1 MHz en Equivalent Input Noise T A = 25˚C, RS = 100Ω ,3 5 3 5 Voltage f = 1 kHz in Equivalent Input Noise T A = 25˚C, f= 1 kHz 0.01 0.01 Current www.national.com 2

Note 1:“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2:Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage. Note 3:Any of the amplifier outputs can be shorted to ground indefinitely, however, more than one should not be simultaneously shorted as the maximum junction temperature will be exceeded. Note 4:The value given is in 400 linear feet/min air flow. Note 5:The value given is in static air. Note 6:These devices are available in both the commercial temperature range 0˚C≤ TA ≤ 70˚C and the military temperature range −55˚C≤ TA ≤ 125˚C. The tem- perature range is designated by the position just before the package type in the device number. A “C” indicates the commercial temperature range and an“M” indi- cates the military temperature range. The military temperature range is available in “H” package only. Note 7:Unless otherwise specified, the specifications apply over the full temperature range and for VS = ±20V for the LF442A and for VS = ±15V for the LF442. VOS ,IB, and IOS are measured at VCM = 0. Note 8:The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, Tj. Due to limited pro- duction test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient tem- perature as a result of internal power dissipation, PD .Tj= TA + θjAPD where θjAis the thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum. Note 9:Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice from ±15V to±5V for the LF442 and±20V to±5V for the LF442A. Note 10:Refer to RETS442X for LF442MH military specifications. Typical Performance Characteristics Input Bias Current DS009155-17 Input Bias Current DS009155-18 Supply Current DS009155-19 Positive Common-Mode Input Voltage Limit DS009155-20 Negative Common-Mode Input Voltage Limit DS009155-21 Positive Current Limit DS009155-22 www.national.com3

Typical Performance Characteristics(Continued) Negative Current Limit DS009155-23 Output Voltage Swing DS009155-24 Output Voltage Swing DS009155-25 Gain Bandwidth DS009155-26 Bode Plot DS009155-27 Slew Rate DS009155-28 Distortion vs Frequency DS009155-29 Undistorted Output Voltage Swing DS009155-30 Open Loop Frequency Response DS009155-31 www.national.com 4

Typical Performance Characteristics(Continued) Pulse Response R L = 10 kΩ ,C L = 10 pF Common-Mode Rejection Ratio DS009155-32 Power Supply Rejection Ratio DS009155-33 Equivalent Input Noise Voltage DS009155-34 Open Loop Voltage Gain DS009155-35 Output Impedance DS009155-36 Inverter Settling Time DS009155-37 Small Signal Inverting DS009155-7 Small Signal Non-Inverting DS009155-8 www.national.com5

Pulse Response R L = 10 kΩ ,C L = 10 pF (Continued) Application Hints This device is a dual low power op amp with internally trimmed input offset voltages and JFET input devices (BI-FET II). These JFETs have large reverse breakdown volt- ages from gate to source and drain eliminating the need for clamps across the inputs. Therefore, large differential input voltages can easily be accommodated without a large in- crease in input current. The maximum differential input volt- age is independent of the supply voltages. However, neither of the input voltages should be allowed to exceed the nega- tive supply as this will cause large currents to flow which can result in a destroyed unit. Exceeding the negative common-mode limit on either input will force the output to a high state, potentially causing a re- versal of phase to the output. Exceeding the negative common-mode limit on both inputs will force the amplifier output to a high state. In neither case does a latch occur since raising the input back within the common-mode range again puts the input stage and thus the amplifier in a normal operating mode. Exceeding the positive common-mode limit on a single input will not change the phase of the output; however, if both in- puts exceed the limit, the output of the amplifier will be forced to a high state. The amplifiers will operate with a common-mode input volt- age equal to the positive supply; however, the gain band- width and slew rate may be decreased in this condition. When the negative common-mode voltage swings to within 3V of the negative supply, an increase in input offset voltage may occur. Each amplifier is individually biased to allow normal circuit operation with power supplies of ±3.0V. Supply voltages less than these may degrade the common-mode rejection and re- strict the output voltage swing. The amplifiers will drive a 10 kΩ load resistance to ± 10V over the full temperature range. Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed unit. As with most amplifiers, care should be taken with lead dress, component placement and supply decoupling in order to ensure stability. For example, resistors from the output to an input should be placed with the body close to the input to minimize “pick-up” and maximize the frequency of the feed- back pole by minimizing the capacitance from the input to ground. A feedback pole is created when the feedback around any amplifier is resistive. The parallel resistance and capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole. In many instances the frequency of this pole is much greater than the expected 3 dB frequency of the closed loop gain and consequenty there is negligible effect on stability margin. However, if the feed- back pole is less than approximately 6 times the expected 3 dB frequency a lead capacitor should be placed from the out- put to the input of the op amp. The value of the added ca- pacitor should be such that the RC time constant of this ca- pacitor and the resistance it parallels is greater than or equal to the original feedback pole time constant. Large Signal Inverting DS009155-9 Large Signal Non-Inverting DS009155-10 www.national.com 6

Battery Powered Strip Chart Preamplifier DS009155-11 Runs from 9v batteries (±9V supplies) Fully settable gain and time constant Battery powered supply allows direct plug-in interface to strip chart recorder without common-mode problems “No FET” Low Power V→ F Converter DS009155-12 Trim 1M pot for 1 kHz full-scale output 15 mW power drain No integrator reset FET required Mount D1 and D2 in close proximity 1% linearity to 1 kHz www.national.com7

Typical Applications(Continued) High Efficiency Crystal Oven Controller DS009155-13

  • Tcontrol= 75˚C
  • A1’s output represents the amplified difference between the LM335 temperature sensor and the crystal oven’s temperature
  • A2, a free running duty cycle modulator, drives the LM395 to complete a servo loop
  • Switched mode operation yields high efficiency
  • 1% metal film resistor Conventional Log Amplifier DS009155-14 R T = Tel Labs type Q81 Trim 5k for 10 µA through the 5k–120k combination *1% film resistor www.national.com 8

Typical Applications(Continued) Unconventional Log Amplifier DS009155-15 Q1, Q2, Q3 are included on LM389 amplifier chip which is temperature-stabilized by the LM389 and Q2-Q3, which act as a heater-sensor pair. Q1, the logging transistor, is thus immune to ambient temperature variation and requires no temperature compensation at all. www.national.com9

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Physical Dimensionsinches (millimeters) unless otherwise noted TO-5 Metal Can Package (H) Order Number LF442AMH or LF442MH/883 www.national.com11

Physical Dimensionsinches (millimeters) unless otherwise noted (Continued) 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. 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com Molded Dual-In-Line Package (N) Order Number LF442ACN or LF442CN LF442 Dual Low Power JFET Input Operational Amplifier 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.