LF147,LF347 LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers Literature Number: SNOSBH1C 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 00564701 Note 1: LF147 available as per JM38510/11906. 00564713 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) 2004 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) Operating Temperature 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 LF147 LF347B/LF347 22V 38V 19V 18V 30V 15V Continuous Continuous LF147 LF347B/LF347 (Note 6) (Note 6) Range Storage Temperature -65CTA150C Range Lead Temperature (Soldering, 10 sec.) 260C 260C Soldering Information (Note 3) Dual-In-Line Package Output Short Circuit Soldering (10 seconds) Duration (Note 4) Power Dissipation 900 mW 1000 mW (Notes 5, 11) Tj max 260C Small Outline Package 150C 150C Vapor Phase (60 seconds) 215C Infrared (15 seconds) 220C Ceramic DIP (J) Package 70C/W See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of soldering surface mount devices. Plastic DIP (N) Package 75C/W ESD Tolerance (Note 12) Surface Mount Narrow (M) 100C/W Surface Mount Wide (WM) 85C/W jA DC Electrical Characteristics Symbol Parameter (Note 7) Conditions LF147 Min VOS Input Offset Voltage RS=10 k, TA=25C LF347B Typ Max Min 1 Over Temperature VOS/T Average TC of Input Offset 900V 5 3 8 RS=10 k 10 Tj=25C, (Notes 7, 8) 25 LF347 Typ Max Min 5 Units Typ Max 5 7 10 13 10 10 mV mV V/C Voltage IOS Input Offset Current Over Temperature IB Input Bias Current 50 Over Temperature RIN Input Resistance Tj=25C Large Signal Voltage Gain VS= 15V, TA=25C 25 25 Tj=25C, (Notes 7, 8) AVOL 100 10 200 50 200 50 8 12 10 100 25 4 50 50 100 50 12 10 100 25 100 pA 4 nA 200 pA 8 nA 12 100 V/mV VO= 10V, RL=2 k Over Temperature 25 25 VO Output Voltage Swing VS= 15V, RL=10 k 12 13.5 11 +15 VCM Input Common-Mode Voltage VS= 15V CMRR Common-Mode Rejection Ratio RS10 k 80 100 PSRR Supply Voltage Rejection Ratio (Note 9) 80 100 IS Supply Current Range www.national.com -12 7.2 2 15 12 13.5 11 +15 -12 11 80 100 80 100 7.2 V/mV 12 13.5 11 +15 11 V V -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, LF347B LF347 Units Typ Max Min Typ Max Min Typ Max -120 -120 -120 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, 20 20 20 f=1000 Hz in Equivalent Input Noise Current Tj=25C, f=1000 Hz 0.01 0.01 0.01 THD Total Harmonic Distortion AV=+10, RL=10k, VO=20 Vp-p, BW=20 Hz-20 kHz < 0.02 < 0.02 < 0.02 % 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 00564714 00564715 Positive Common-Mode Input Voltage Limit Supply Current 00564716 00564717 Negative Common-Mode Input Voltage Limit Positive Current Limit 00564719 00564718 www.national.com 4 LF147/LF347 Typical Performance Characteristics (Continued) Negative Current Limit Output Voltage Swing 00564720 00564721 Output Voltage Swing Gain Bandwidth 00564723 00564722 Bode Plot Slew Rate 00564724 00564725 5 www.national.com LF147/LF347 Typical Performance Characteristics (Continued) Undistorted Output Voltage Swing Distortion vs Frequency 00564726 00564727 Open Loop Frequency Response Common-Mode Rejection Ratio 00564729 00564728 Power Supply Rejection Ratio Equivalent Input Noise Voltage 00564730 www.national.com 00564731 6 LF147/LF347 Typical Performance Characteristics (Continued) Open Loop Voltage Gain Output Impedance 00564733 00564732 Inverter Settling Time 00564734 7 www.national.com LF147/LF347 Pulse Response RL=2 k, CL=10 pF Large Signal Inverting Small Signal Inverting 00564706 Large Signal Non-Inverting 00564704 Small Signal Non-Inverting 00564707 00564705 Current Limit (RL=100) 00564708 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. 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 supply voltages. However, neither of the input voltages www.national.com 8 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. (Continued) 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. 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. 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 or that the unit is not inadvertently installed backwards in a Detailed Schematic 00564709 9 www.national.com LF147/LF347 Application Hints LF147/LF347 Typical Applications Digitally Selectable Precision Attenuator 00564710 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 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 Attenuation www.national.com 10 LF147/LF347 Typical Applications (Continued) Long Time Integrator with Reset, Hold and Starting Threshold Adjustment 00564711 * 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 11 www.national.com LF147/LF347 Typical Applications (Continued) Universal State Variable Filter 00564712 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 www.national.com 12 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 13 www.national.com 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. 2. 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