LF412JAN LF412JAN Low Offset, Low Drift Dual JFET Input Operational Amplifier Literature Number: SNOSAQ7 LF412JAN Low Offset, Low Drift Dual JFET Input Operational Amplifier General Description Features This device is a low cost, high speed, JFET input operational amplifier with very low input offset voltage and guaranteed input offset voltage drift. It requires low supply current yet maintains a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF412 dual is pin compatible with the LM1558, allowing designers to immediately upgrade the overall performance of existing designs. This amplifier may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage and drift, low input bias current, high input impedance, high slew rate and wide bandwidth. ■ ■ ■ ■ ■ ■ ■ ■ ■ Input offset voltage drift: 30 μV/°C (max) Low input bias current: 50 pA (Typ) Wide gain bandwidth: 3 MHz (Typ) High slew rate: 7V/μs (min) High input impedance: 1012Ω Low total harmonic distortion <0.02% Low 1/f noise corner: 50 Hz Fast settling time to 0.01%: 2 μs (Typ) Low input noise current: Ordering Information NS Part Number JAN Part Number NS Package Number Package Description JL412BPA JM38510/11905BPA J08A 8LD CERDIP Connection Diagram Dual-In-Line Package 20153644 See NS Package Number J08A BI-FET II™ is a trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation 201536 www.national.com LF412JAN Low Offset, Low Drift Dual JFET Input Operational Amplifier December 8, 2010 LF412JAN Simplified Schematic 1/2 Dual 20153643 Detailed Schematic 20153632 www.national.com 2 LF412JAN Absolute Maximum Ratings (Note 1) Supply Voltage Differential Input Voltage Input voltage Range(Note 3) Output Short Circuit Duration (Note 4) Power Dissipation(Note 2) CERDIP Package TJmax Thermal Resistance ±18V ±30V ±15V Continuous 800mW 175°C θJA CERDIP Package (Still Air) CERDIP Package (500 LF/Min Air Flow) 122°C/W 66°C/W θJC CERDIP Package Supply voltage Range Operating Temperature Range 15°C/W ±5V to ±15V −55°C ≤ TA ≤ 125°C −65°C ≤ TA ≤ 150°C 260°C 1,700V Storage Temperature Range Lead Temperature Soldering (10 Sec) ESD Tolerance(Note 5) Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup Description Temp (°C) 1 Static tests at +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 LF412JAN Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. Symbol VIO Parameter Input Offset Voltage ±VCC = ±15V, VCM = 0V Conditions Notes Max Unit +VCC = 26V, -VCC = -4V, VCM = -11V -5.0 5.0 mV 1 -7.0 7.0 mV 2, 3 +VCC = 4V, -VCC = -26V, VCM = 11V -5.0 5.0 mV 1 -7.0 7.0 mV 2, 3 -5.0 5.0 mV 1 -7.0 7.0 mV 2, 3 -5.0 5.0 mV 1 -7.0 7.0 mV 2, 3 -0.4 0.2 nA 1 ±VCC = ±5V +VCC = 26V, -VCC = -4V, VCM = -11V ±IIB Input Bias Current +VCC = 4V, -VCC = -26V, VCM = 11V IIO Subgroup Min Input Offset Current -10 50 nA 2 -0.2 0.2 nA 1 -10 50 nA 2 -0.2 1.2 nA 1 -10 70 nA 2 -0.1 0.1 nA 1 -20 20 nA 2 +PSRR Power Supply Rejection Ratio +VCC = 20V to 10V, -VCC = -15V -PSRR Power Supply Rejection Ratio +VCC = 15V, -VCC = -20V to -10V 80 dB 1, 2, 3 CMRR Input Voltage Common Mode Rejection VCM = -11V to +11V 80 dB 1, 2, 3 +IOS Output Short Circuit Current t ≤ 25mS -80 mA 1, 2, 3 -IOS Output Short Circuit Current t ≤ 25mS 80 mA 1, 2, 3 ICC Supply Current 7.0 mA 1, 2 8.0 mA 3 -30 30 µV/°C 2 -30 30 µV/°C 3 V 4, 5, 6 ΔVIO / ΔT Input Offset Voltage +VOP Output Voltage Swing 25°C ≤ TA ≤ +125°C -55°C ≤ TA ≤ 25°C (Note 6) dB 1, 2, 3 RL = 10KΩ 12 RL = 2KΩ 10 V 4, 5, 6 RL = 10KΩ -12 V 4, 5, 6 RL = 2KΩ -10 V 4, 5, 6 -VOP Output Voltage Swing -AVS Open Loop Voltage Gain RL = 2KΩ, VO = -10V (Note 8) +AVS Open Loop Voltage Gain RL = 2KΩ, VO = 10V (Note 8) AVS Open Loop Voltage Gain RL = 10KΩ, VO = ±2V, ±VCC = ±5V (Note 8) www.national.com 80 4 50 V/mV 4 25 V/mV 5, 6 50 V/mV 4 25 V/mV 5, 6 20 V/mV 4, 5, 6 The following conditions apply, unless otherwise specified. Symbol Parameter ±VCC = ±15V, VCM = 0V Conditions AV = 1, VI = 50mV, Max Unit Subgroup (Note 7) 200 nS 7, 8A, 8B (Note 7) 40 % 7, 8A, 8B Notes TRTR Transient Response Rise Time TROS Transient Response Overshoot SR+ Slew Rate VI = -5V to +5V SR- Slew Rate VI = +5V to -5V NIBB Noise Broadband BW = 10Hz to 15KHz, RS = 0Ω (Note 9) NIPC Noise Popcorn BW = 10Hz to 15KHz, RS = 100KΩ (Note 9) CS Channel Separation RL = 2KΩ, VI = ±10V (Note 9) ±tS Settling Time AV = 1 (Note 7) CL = 100pF, RL = 2KΩ AV = 1, VI = 50mV, CL = 100pF, RL = 2KΩ Min 7.0 V/µS 7 5.0 V/µS 8A, 8B 7.0 V/µS 7 5.0 V/µS 8A, 8B 15 µVRMS 7 80 µVPK 7 dB 7 1500 nS 12 Min Max Unit Subgroup 80 DC Drift Parameters The following conditions apply, unless otherwise specified. Delta calculations are performed at group B5, only. Symbol Parameter ±VCC = ±15V, VCM = 0V Conditions Notes VIO Input Offset Voltage -1.0 1.0 mV 1 ±IIB Input Bias Current -0.1 0.1 nA 1 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, 1.5 kΩ in series with 100 pF. Note 6: Calculated parameter. Note 7: Bench test. Note 8: Datalog reading in K = V/mV. Note 9: Test on either A360, AC or bench test. 5 www.national.com LF412JAN AC Parameters LF412JAN Typical Connection 20153641 Typical Performance Characteristics Input Bias Current Input Bias Current 20153610 20153611 Supply Current Positive Common-Mode Input Voltage Limit 20153612 20153613 www.national.com 6 LF412JAN Negative Common-Mode Input Voltage Limit Positive Current Limit 20153615 20153614 Negative Current Limit Output Voltage Swing 20153616 20153617 Output Voltage Swing Gain Bandwidth 20153619 20153618 7 www.national.com LF412JAN Bode Plot Slew Rate 20153621 20153620 Distortion vs Frequency Undistorted Output Voltage Swing 20153622 20153623 Open Loop Frequency Response Common-Mode Rejection Ratio 20153625 20153624 www.national.com 8 LF412JAN Power Supply Rejection Ratio Equivalent Input Noise Voltage 20153626 20153627 Output Impedance Open Loop Voltage Gain 20153628 20153629 Inverter Settling Time 20153630 9 www.national.com LF412JAN Pulse Response RL=2 kΩ, CL=10 pF Small Signal Inverting Small Signal Non-Inverting 20153636 20153637 Large Signal Inverting Large Signal Non-Inverting 20153639 20153638 Current Limit (RL=100Ω) 20153640 www.national.com 10 The LF412 JFET input dual op amp is internally trimmed (BIFET II™) providing very low input offset voltages and guaranteed input offset voltage drift. 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 cause a reversal of the phase to the output and force the amplifier output 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. 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 may 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 by a zener reference which allows normal circuit operation on ±6.0V power supplies. Supply voltages less than these may result in lower gain bandwidth and slew rate. Typical Application Single Supply Sample and Hold 20153631 11 www.national.com LF412JAN The amplifiers will drive a 2 kΩ load resistance to ±10V over the full temperature range. If the amplifier is forced to drive heavier load currents, however, an increase in input offset voltage may occur on the negative voltage swing and finally reach an active current limit on both positive and negative swings. 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 consequently 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 LF412JAN Revision History Date Released Revision Section 12/08/2010 A New Release to Corporate format www.national.com Changes 12 1 MDS datasheet converted into Corporate datasheet format. MJLF412-X Rev 0C1 will be archived. LF412JAN Physical Dimensions inches (millimeters) unless otherwise noted Dual-In-Line Package (J) NS Package Number J08A 13 www.national.com LF412JAN Low Offset, Low Drift Dual 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. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices 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. A critical component is any component in 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 and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2010 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Technical Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Technical Support Center Email: [email protected] National Semiconductor Asia Pacific Technical Support Center Email: [email protected] National Semiconductor Japan Technical Support Center Email: [email protected] IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Audio www.ti.com/audio Communications and Telecom www.ti.com/communications Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps DLP® Products www.dlp.com Energy and Lighting www.ti.com/energy DSP dsp.ti.com Industrial www.ti.com/industrial Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical Interface interface.ti.com Security www.ti.com/security Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive Microcontrollers microcontroller.ti.com Video and Imaging RFID www.ti-rfid.com OMAP Mobile Processors www.ti.com/omap Wireless Connectivity www.ti.com/wirelessconnectivity TI E2E Community Home Page www.ti.com/video e2e.ti.com Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2011, Texas Instruments Incorporated