LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers General Description Features The LF147 is a low cost, high speed quad JFET input operational amplifier with an internally trimmed input offset voltage (BI-FET IITM technology). The device requires a low supply current and yet maintains a large gain bandwidth product and a fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF147 is pin compatible with the standard LM148. This feature allows designers to immediately upgrade the overall performance of existing LF148 and LM124 designs. The LF147 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, low input bias current, high input impedance, high slew rate and wide bandwidth. The device has low noise and offset voltage drift. n n n n n n n n n n Simplified Schematic Connection Diagram Quad Internally trimmed offset voltage: Low input bias current: Low input noise current: Wide gain bandwidth: High slew rate: Low supply current: High input impedance: Low total harmonic distortion: Low 1/f noise corner: Fast settling time to 0.01%: 5 mV max 50 pA 0.01 pA/Hz 4 MHz 13 V/s 7.2 mA 1012 0.02% 50 Hz 2 s Dual-In-Line Package 14 DS005647-1 DS005647-13 Note 1: LF147 available as per JM38510/11906. Top View Order Number LF147J, LF147J-SMD, LF347M, LF347BN, LF347N, LF147J/883, or JL147 BCA (Note 1) See NS Package Number J14A, M14A or N14A BI-FET IITM is a trademark of National Semiconductor Corporation. (c) 2000 National Semiconductor Corporation DS005647 www.national.com LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers August 2000 LF147/LF347 Absolute Maximum Ratings (Note 2) LF147 Surface Mount Wide (WM) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Soldering Information Dual-In-Line Package Soldering (10 seconds) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Differential Input Voltage Input Voltage Range (Note 3) Output Short Circuit Duration (Note 4) Power Dissipation (Notes 5, 11) Tj max jA Ceramic DIP (J) Package Plastic DIP (N) Package Surface Mount Narrow (M) LF147 22V 38V 19V LF347B/LF347 18V 30V 15V Continuous Continuous 900 mW 1000 mW 150C 150C Symbol Parameter Input Offset Voltage Conditions LF147 RS =10 k, TA =25C Typ 1 Over Temperature VOS/T Average TC of Input Offset -65CTA150C 260C 260C 260C 215C 220C (Note 7) Min VOS (Note 6) See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of soldering surface mount devices. ESD Tolerance (Note 12) 900V 70C/W 75C/W 100C/W DC Electrical Characteristics LF347B/LF347 85C/W (Note 6) LF347B Max Min 5 Typ 3 8 RS =10 k 10 Tj =25C, (Notes 7, 8) 25 LF347 Max Min 5 Typ 5 7 Units Max 10 13 10 10 mV mV V/C Voltage IOS Input Offset Current Over Temperature IB Input Bias Current Tj =25C, (Notes 7, 8) Input Resistance Tj =25C AVOL Large Signal Voltage Gain VS = 15V, TA =25C 25 25 50 Over Temperature RIN 100 25 4 200 50 50 200 50 8 1012 50 100 1012 100 50 100 25 100 pA 4 nA 200 pA 8 nA 1012 100 V/mV VO = 10V, RL =2 k Over Temperature 25 25 15 V/mV VO Output Voltage Swing VS = 15V, RL =10 k 12 13.5 12 13.5 12 13.5 V VCM Input Common-Mode Voltage VS = 15V 11 +15 11 +15 11 +15 V Common-Mode Rejection Ratio RS10 k 80 100 PSRR Supply Voltage Rejection Ratio (Note 9) 80 100 IS Supply Current Range CMRR www.national.com -12 7.2 2 -12 11 80 100 80 100 7.2 11 -12 V 70 100 dB 70 100 7.2 dB 11 mA Symbol Parameter (Note 7) Conditions LF147 Min Amplifier to Amplifier Coupling TA =25C, Typ LF347B Max Min -120 Typ LF347 Max Min -120 Typ -120 Units Max dB f=1 Hz-20 kHz (Input Referred) SR Slew Rate VS = 15V, TA =25C 8 13 8 13 8 13 V/s GBW Gain-Bandwidth Product VS = 15V, TA =25C 2.2 4 2.2 4 2.2 4 MHz en Equivalent Input Noise Voltage TA =25C, RS =100, in Equivalent Input Noise Current THD Total Harmonic Distortion 20 20 20 Tj =25C, f=1000 Hz 0.01 0.01 0.01 AV =+10, RL =10k, VO =20 Vp-p, BW=20 Hz-20 kHz < 0.02 < 0.02 < 0.02 f=1000 Hz % Note 2: 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 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: For operating at elevated temperature, these devices must be derated based on a thermal resistance of jA. Note 6: The LF147 is available in the military temperature range -55CTA125C, while the LF347B and the LF347 are available in the commercial temperature range 0CTA70C. Junction temperature can rise to Tj max = 150C. Note 7: Unless otherwise specified the specifications apply over the full temperature range and for VS = 20V for the LF147 and for VS = 15V for the LF347B/LF347. VOS, IB, and IOS are measured at VCM =0. Note 8: The input bias currents are junction leakage currents which approximately double for every 10C increase in the junction temperature, Tj. Due to limited production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation, PD. Tj =TA+jA PD where jA is 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 VS = 5V to 15V for the LF347 and LF347B and from VS = 20V to 5V for the LF147. Note 10: Refer to RETS147X for LF147D and LF147J military specifications. Note 11: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate outside guaranteed limits. Note 12: Human body model, 1.5 k in series with 100 pF. 3 www.national.com LF147/LF347 AC Electrical Characteristics LF147/LF347 Typical Performance Characteristics Input Bias Current Input Bias Current DS005647-14 Positive Common-Mode Input Voltage Limit Supply Current DS005647-16 DS005647-15 Negative Common-Mode Input Voltage Limit Positive Current Limit DS005647-19 DS005647-17 Negative Current Limit DS005647-18 Output Voltage Swing DS005647-20 www.national.com Output Voltage Swing DS005647-21 4 DS005647-22 Gain Bandwidth (Continued) Bode Plot Slew Rate DS005647-23 Distortion vs Frequency LF147/LF347 Typical Performance Characteristics DS005647-24 Undistorted Output Voltage Swing DS005647-25 Open Loop Frequency Response DS005647-26 DS005647-27 Common-Mode Rejection Ratio Power Supply Rejection Ratio DS005647-29 Equivalent Input Noise Voltage DS005647-30 5 DS005647-28 DS005647-31 www.national.com LF147/LF347 Typical Performance Characteristics Open Loop Voltage Gain (Continued) Output Impedance DS005647-33 DS005647-32 www.national.com Inverter Settling Time 6 DS005647-34 LF147/LF347 Pulse Response RL =2 k, CL =10 pF Small Signal Inverting Small Signal Non-Inverting DS005647-4 DS005647-5 Large Signal Inverting Large Signal Non-Inverting DS005647-6 DS005647-7 Current Limit (RL =100) DS005647-8 ply 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 Application Hints The LF147 is an op amp with an internally trimmed input offset voltage 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 sup7 www.national.com LF147/LF347 Application Hints 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. (Continued) 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 by a zener reference which allows normal circuit operation on 4.5V power supplies. Supply voltages less than these may result in lower gain bandwidth and slew rate. The LF147 will drive a 2 k 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 Detailed Schematic DS005647-9 www.national.com 8 LF147/LF347 Typical Applications Digitally Selectable Precision Attenuator DS005647-10 All resistors 1% tolerance * * * * Accuracy of better than 0.4% with standard 1% value resistors No offset adjustment necessary Expandable to any number of stages Very high input impedance A1 A2 A3 VO Attenuation 0 0 0 0 0 0 1 -1 dB 0 1 0 -2 dB 0 1 1 -3 dB 1 0 0 -4 dB 1 0 1 -5 dB 1 1 0 -6 dB 1 1 1 -7 dB 9 www.national.com LF147/LF347 Typical Applications (Continued) Long Time Integrator with Reset, Hold and Starting Threshold Adjustment DS005647-11 * VOUT starts from zero and is equal to the integral of the input voltage with respect to the threshold voltage: * * * Output starts when VINVTH Switch S1 permits stopping and holding any output value Switch S2 resets system to zero www.national.com 10 LF147/LF347 Typical Applications (Continued) Universal State Variable Filter DS005647-12 For circuit shown: fo =3 kHz, fNOTCH =9.5 kHz Q=3.4 Passband gain: Highpass -- 0.1 Bandpass -- 1 Lowpass -- 1 Notch -- 10 * foxQ200 kHz * 10V peak sinusoidal output swing without slew limiting to 200 kHz * See LM148 data sheet for design equations 11 www.national.com LF147/LF347 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number LF147J, LM147J-SMD or LF147J/883 NS Package Number J14A S.O. Package (M) Order Number LF347M or LF347MX NS Package Number M14A www.national.com 12 LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LF347BN or LF347N NS Package Number N14A 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 AND GENERAL COUNSEL 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 Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 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 Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 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. National P/N LF347 - Wide Bandwidth Quad JFET Input Operational Amplifiers Products > Analog - Amplifiers > Operational Amplifiers > General Purpose > LF347 Product Folder LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers See Also: LMC660 - improved bandwidth, slew rate, input bias current and output current. LMC6034 - improved slew rate, bandwidth, supply current per channel, offset voltage, input bias and output current. LMC6084 - Much improved offset voltage, output current, slew rate and bandwidth. Generic P/N 347 Contents Channels (Channels) 4 Input Output Type Vcm to V-,R-R Out,Vcm to V+,Not R-R Out Datasheet Bandwidth, typ (MHz) 4 Package Availability, Models, Samples & Pricing Slew Rate, typ (Volts/usec) 13 Supply Current per Channel, typ (mA) 1.80 Minimum Supply Voltage (Volt) 10 Maximum Supply Voltage (Volt) 36 Offset Voltage, Max (mV) 10,5 Input Bias Current, Temp Max (nA) 8 Output Current, typ (mA) 31 Voltage Noise, typ (nV/Hz) 20 Shut down No Special Features Undefined General Description Features Parametric Table Design Tools General Description file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LF347.html (1 of 3) [9/6/2001 11:34:20 AM] National P/N LF347 - Wide Bandwidth Quad JFET Input Operational Amplifiers The LF147 is a low cost, high speed quad JFET input operational amplifier with an internally trimmed input offset voltage (BI-FET IITM technology). The device requires a low supply current and yet maintains a large gain bandwidth product and a fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF147 is pin compatible with the standard LM148. This feature allows designers to immediately upgrade the overall performance of existing LF148 and LM124 designs. The LF147 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, low input bias current, high input impedance, high slew rate and wide bandwidth. The device has low noise and offset voltage drift. Features Internally trimmed offset voltage: Low input bias current: 5 mV max 50 pA Low input noise current: 0.01 pA/SqrtHz Wide gain bandwidth: 4 MHz High slew rate: 13 V/s Low supply current: 7.2 mA 1012Ohm High input impedance: Low total harmonic distortion: Low 1/f noise corner: <0.02% 50 Hz Fast settling time to 0.01%: 2 s Datasheet Title Size (in Kbytes) Date View Online LF147/LF347 Wide Bandwidth Quad JFET Input Operational 404 29-Aug-00 View Online Amplifiers Kbytes LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers (JAPANESE) 672 Kbytes View Online Download Download Download Please use Adobe Acrobat to view PDF file(s). If you have trouble printing, see Printing Problems. file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LF347.html (2 of 3) [9/6/2001 11:34:20 AM] Receive via Email Receive via Email Receive via Email National P/N LF347 - Wide Bandwidth Quad JFET Input Operational Amplifiers Package Availability, Models, Samples & Pricing Package Part Number Type Models # pins SOIC NARROW(MCM) 14 LF347MX SOIC NARROW(MCM) LF347BN MDIP(MCM) LF347M LF347N MDIP(MCM) Status SPICE IBIS Full production N/A 14 Full production N/A N/A 14 Full production N/A N/A Full production N/A N/A 14 Samples & Electronic Orders N/A 24 Hour Samples Budgetary Pricing Std $US Pack Quantity Size each 1K+ $0.6000 tube of 55 1K+ $0.6000 reel [logo]UZ2T of LF347M 2500 1K+ $0.8400 tube [logo]UZ3TP of LF347BN 25 1K+ $0.6000 Buy Now Buy Now 24 Hour Samples Buy Now LF347 MDC Die Full production N/A N/A LF347 MWC Wafer Full production N/A N/A Buy Now Package Marking [logo]UZ2T LF347M tube [logo]UZ3TP of LF347N 25 tray of N/A N/A Design Tools Size (in Kbytes) Title Amplifiers Selection Guide software for Windows 9 Kbytes Date View Online Download Receive via Email View 12-Jun-2001 Please use Adobe Acrobat to view PDF file(s). If you have trouble printing, see Printing Problems. [Information as of 19-Jul-2001] Quick Search Parametric Search System Diagrams Product Tree Home About Languages . Website Guide . About "Cookies" . National is QS 9000 Certified Site Terms & Conditions of Use . Copyright 2001 (c) National Semiconductor Corporation Privacy/Security Statement . Preferences . Feedback file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LF347.html (3 of 3) [9/6/2001 11:34:20 AM] -