LF442QML LF442QML Dual Low Power JFET Input Operational Amplifier Literature Number: SNOSAO8 LF442QML Dual Low Power JFET Input Operational Amplifier General Description Features The LF442 dual low power operational amplifier provides many of the same AC characteristics as the industry standard LM1458 while greatly improving the DC characteristics of the LM1458. The amplifier has the same bandwidth, slew rate, and gain (10 kΩ load) as the LM1458 and only draws one tenth the supply current of the LM1458. In addition the well matched high voltage JFET input devices of the LF442 reduce the input bias and offset currents by a factor of 10,000 over the LM1458. A combination of careful layout design and internal trimming guarantees very low input offset voltage and voltage drift. The LF442 also has a very low equivalent input noise voltage for a low power amplifier. The LF442 is pin compatible with the LM1458 allowing an immediate 10 times reduction in power drain in many applications. The LF442 should be used where low power dissipation and good electrical characteristics are the major considerations. ■ ■ ■ ■ ■ ■ ■ ■ ■ 1/10 supply current of a LM1458: 400 μA (max) Low input bias current: 50 pA (Typ) Low input offset voltage: 1 mV (Typ) Low input offset voltage drift: 7 μV/°C (Typ) High gain bandwidth: 1 MHz (Typ) High slew rate: 1 V/μs (Typ) (Typ) Low noise voltage for low power: Low input noise current: (Typ) High input impedance: 1012Ω Ordering Information NS Paart Number SMD Part Number NS Package Number LF442MH/883 5962-9763301QGA H08C Package Description 8LD T0–99 Metal Can Connection Diagram Typical Connection Metal Can Package 20149402 Pin 4 connected to case 20149401 Top View See NS Package Number H08C BI-FET II™ is a trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation 201494 www.national.com LF442QML Dual Low Power JFET Input Operational Amplifier December 16, 2010 LF442QML Simplified Schematic 1/2 Dual 20149403 Detailed Schematic 1/2 Dual 20149416 www.national.com 2 LF442QML Absolute Maximum Ratings (Note 1) Supply Voltage Differential Input Voltage Input Voltage Range (Note 3) Output Short Circuit Duration (Note 4) Maximum Power Dissipation (Note 2) TJ max Thermal Resistance ±18V ±30V ±15V Continuous 900mW 150°C θJA Still Air 500LF/Min Air flow 161°C/W 87°C/W 33°C/W θJC Operating Temperature Range −55°C ≤ TA ≤ 125°C −65°C ≤ TA ≤ 150°C 260°C 500V Storage Temperature Range Lead Temperature (Soldering, 10 sec.) ESD Tolerance (Note 5) Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup Description 1 Static tests at Temp (°C) +25 2 Static tests at +125 3 Static tests at -55 4 Dynamic tests at +25 5 Dynamic tests at +125 6 Dynamic tests at -55 7 Functional tests at +25 8A Functional tests at +125 8B Functional tests at -55 9 Switching tests at +25 10 Switching tests at +125 11 Switching tests at -55 12 Settling time at +25 13 Settling time at +125 14 Settling time at -55 3 www.national.com LF442QML LF442 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. Symbol ICC Parameter Conditions Notes Min Supply Current VIO Input Offset Voltage ±IIB Input Bias Current IIO Input Offset Current CMRR Common Mode Rejection Ratio PSRR VS = ±15V, VCM = 0V, RS = 0Ω Power Supply Rejection Ratio RS = 10KΩ Max Unit Subgroups 1, 2, 3 500 µA -5.0 5.0 mV 1 -7.5 7.5 mV 2, 3 0.1 nA 1 20 nA 2 -0.05 0.05 nA 1 -10 10 nA 2 VCM = ±11V, RS = 10K 70 dB 1, 2, 3 VS+ = +15V to +6V, VS- = -15V 70 dB 1, 2, 3 VS- = -15V to -6V, VS+ = +15V 70 dB 1, 2, 3 25 V/mV 4 15 V/mV 5, 6 25 V/mV 4 15 V/mV 5, 6 12 V 4, 5, 6 -12 V 4, 5, 6 11 -11 V 4, 5, 6 Min Max Unit Subgroups 0.6 V/µS 7 VO = 0V to +10V, +AVS Large Signal Voltage Gain -AVS Large Signal Voltage Gain VO+ Output Voltage Swing VI = ±11V, RL = 10K VO- Output Voltage Swing VI = ±11V, RL = 10K VCM Input Common Mode Voltage Range (Note 7) RL = 10KΩ VO = 0V to -10V, (Note 7) RL = 10KΩ (Note 6) AC Parameters The following conditions apply, unless otherwise specified. Symbol Parameter VS = ±15V, VCM = 0V, RS = 0Ω Conditions VO = -5V to +5V, AV = 1, Notes SR+ Slew Rate SR- Slew Rate AV = 1, RL = 2KΩ, CL - 100pF 0.6 V/µS 7 GBW Gain Band Width VI = 50mV, ƒ = 20KHz 0.6 MHz 7 RL = 2KΩ, CL - 100pF VO = +5V to -5V, 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. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. Note 3: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage. Note 4: 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 5: Human Body Model, 100pF discharged through 1.5KΩ Note 6: Parameter tested go-no-go only, guaranteed by CMRR test.. Note 7: V/mV in units column is equivalent to K in datalog. www.national.com 4 LF442QML Typical Performance Characteristics Input Bias Current Input Bias Current 20149418 20149417 Supply Current Positive Common-Mode Input Voltage Limit 20149419 20149420 Negative Common-Mode Input Voltage Limit Positive Current Limit 20149422 20149421 5 www.national.com LF442QML Negative Current Limit Output Voltage Swing 20149423 20149424 Output Voltage Swing Gain Bandwidth 20149425 20149426 Bode Plot Slew Rate 20149427 www.national.com 20149428 6 LF442QML Distortion vs Frequency Undistorted Output Voltage Swing 20149429 20149430 Open Loop Frequency Response Common-Mode Rejection Ratio 20149431 20149432 Power Supply Rejection Ratio Equivalent Input Noise Voltage 20149434 20149433 7 www.national.com LF442QML Open Loop Voltage Gain Output Impedance 20149435 20149436 Inverter Settling Time 20149437 www.national.com 8 LF442QML Pulse Response RL = 10 kΩ, CL = 10 pF Small Signal Inverting Small Signal Non-Inverting 20149407 20149408 Large Signal Inverting Large Signal Non-Inverting 20149409 20149410 9 www.national.com LF442QML than these may degrade the common-mode rejection and restrict 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 feedback 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 feedback pole is less than approximately 6 times the expected 3 dB frequency a lead capacitor should be placed from the output to the input of the op amp. The value of the added capacitor should be such that the RC time constant of this capacitor and the resistance it parallels is greater than or equal to the original feedback pole time constant. 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 voltages 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 increase in input current. The maximum differential input voltage is independent of the supply voltages. However, neither of the input voltages should be allowed to exceed the negative 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 reversal 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 inputs exceed the limit, the output of the amplifier will be forced to a high state. The amplifiers will operate with a common-mode input voltage equal to the positive supply; however, the gain bandwidth 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 www.national.com 10 LF442QML Typical Applications Battery Powered Strip Chart Preamplifier 20149411 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 20149412 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 11 www.national.com LF442QML High Efficiency Crystal Oven Controller 20149413 — — — — — 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 20149414 RT = Tel Labs type Q81 Trim 5k for 10 μA through the 5k–120k combination *1% film resistor www.national.com 12 LF442QML Unconventional Log Amplifier 20149415 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. 13 www.national.com LF442QML Revision History Date Released Revision 12/16/2010 A www.national.com Section Changes New release to corporate format 14 1 MDS datasheet converted into one corporate datasheet format. MNLF442M-X Rev 0A1 will be archived. LF442QML Physical Dimensions inches (millimeters) unless otherwise noted 8 LD TO-99 Metal Can (H) NS Package Number H08C 15 www.national.com LF442QML Dual Low Power JFET Input Operational Amplifier Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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