LF147QML LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier Literature Number: SNOSAI1 LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier 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 II™ 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. j Internally trimmed offset voltage: 5 mV max j Low input bias current: 50 pA Typ. 0.01 pA/√Hz Typ. j Low input noise current: j Wide gain bandwidth: 4 MHz Typ. j High slew rate: 13 V/µs Typ. j Low supply current: 7.2 mA Typ. 1012Ω Typ. j High input impedance: j Low total harmonic distortion: AV = 10, RL = 10KΩ, VO = 20VP-P BW = 20Hz – 20KHz ≤0.02% Typ. j Low 1/f noise corner: 50 Hz Typ. j Fast settling time to 0.01%: 2 µs Typ. Ordering Information NS Part Number SMD Part Number LF147J/883 LF147J-SMD 8102306CA NS Package Number Package Description J14A 14LD CERDIP J14A 14LD CERDIP Connection Diagram Dual-In-Line Package 20122601 Top View See NS Package Number J14A BI-FET II™ is a trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS201226 www.national.com LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier April 2005 LF147QML Simplified Schematic ⁄ Quad 14 20122613 Detailed Schematic 20122609 www.national.com 2 LF147QML Absolute Maximum Ratings (Note 1) ± 22V ± 38V ± 19V Supply Voltage Differential Input Voltage Input Voltage Range (Note 2) Output Short Circuit Duration (Note 3) Continuous Power Dissipation (Notes 4, 5) 900 mW TJ max 150˚C θJA CERDIP 70˚C/W Operating Temperature Range −55˚C ≤ TA ≤ 125˚C Storage Temperature Range −65˚C ≤ TA ≤ 150˚C Lead Temperature (Soldering, 10 sec.) 260˚C ESD (Note 6) 900V 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 LF147 883 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified: Symbol Parameter Conditions VIO Input Offset Voltage RS = 10KΩ IIO Input Offset Current RL = 10KΩ ± IIB Input Bias Current VCM Input Common Mode Voltage Range VS = ± 20V, VCM = 0V, RS = 50Ω Notes RL =10KΩ (Note 7) CMRR Common Mode Rejection Ratio RS ≤ 10KΩ, VCM = ± 16V PSRR Power Supply Rejection Ratio IS Supply Current IOS Output Short Circuit Min Subgroups Max Unit 5 mV 1 8 mV 2, 3 0.1 nA 1 25 nA 2, 3 -0.2 0.2 nA 1 -50 50 nA 2, 3 -16 16 V 1, 2, 3 80 dB 1, 2, 3 VS = ± 20V to VS = ± 5V 80 dB 1, 2, 3 11 mA 1, 2, 3 VS = ± 15V, VI = +1V, Output short to GND -57 -13 mA 1, 3 -40 -6 mA 2 VS = ± 15V, VI = -1V, 13 57 mA 1, 3 Output short to GND 6 40 mA 2 3 www.national.com LF147QML LF147 883 Electrical Characteristics (Continued) DC Parameters (Continued) The following conditions apply, unless otherwise specified: Symbol Parameter Conditions AVS Large Signal Voltage Gain VO Output Voltage Swing VS = ± 20V, VCM = 0V, RS = 50Ω Min VS = ± 15V, VO = 0 to +10V, RL = 2KΩ, RS = 10KΩ (Note 8) 50 V/mV 4 (Note 8) 25 V/mV 5, 6 VS = ± 15V, VO = 0 to -10V RL = 2 KΩ, RS=10KΩ (Note 8) 50 V/mV 4 (Note 8) 25 V/mV 5, 6 12 V 4, 5, 6 V 4, 5, 6 VS = ± 15V, RL = 10KΩ, VI = +1V VS = ± 15V, RL = 10KΩ, VI = -1V Max -12 VS = ± 15V, RL = 2KΩ, VI = +1V 10 VS = ± 15V, RL = 2KΩ, VI = -1V Unit Subgroups Notes V 4, 5, 6 -10 V 4, 5, 6 Max Unit Subgroups V/µs 7 8A, 8B AC Parameters The following conditions apply, unless otherwise specified: VS = ± 20V, VCM = 0V, RS = 50Ω Symbol Parameter Conditions SR Slew Rate VI = -5V to +5V, AV=1 RL = 2KΩ, CL = 100pF 8 5 V/µs VI = +5V to -5V, AV = 1 RL = 2KΩ, CL = 100pF 8 V/µS 7 5 V/µS 8A, 8B www.national.com Notes 4 Min LF147QML LF147 SMD Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified: Symbol VIO Parameter Input Offset Voltage VS = ± 15V, VCM = 0V, RS = 0Ω, RL = Open Conditions Notes Vcc = ± 15V Vcc = ± 9V Min Max Unit Subgroups -9 9 mV 1 -15 15 mV 2, 3 -9 9 mV 1 IIO Input Offset Current -0.1 0.1 nA 1 -20 20 nA 2 ± IIB Input Bias Current -0.2 0.2 nA 1 -50 50 AVS Large Signal Voltage Gain nA 2 VS = ± 15V, VO = 0 to +10V, RL = 2KΩ 35 V/mV 4 15 V/mV 5, 6 VS = ± 15V, VO = 0 to -10V, RL = 2KΩ 35 V/mV 4 15 V/mV 5, 6 Output Voltage Swing VS = ± 15V, RL = 10KΩ 12 V 4, 5, 6 10 -VO Output Voltage Swing VS = ± 15V, RL = 2KΩ VS = ± 15V, RL = 10KΩ VS = ± 15V, RL = 2KΩ VCM Input Common Mode Voltage Range +VO (Note 7) V 4, 5, 6 -12 V 4, 5, 6 -10 V 4, 5, 6 V 1, 2, 3 ± 11 CMRR Common Mode Rejection Ratio VCM = ± 11V 80 dB 1 +PSRR Power Supply Rejection Ratio +VS = 15 to 9V, -VS = -15V 80 dB 1 -PSRR Power Supply Rejection Ratio +VS = 15V, -VS = -15 to -9V 80 dB 1 +IS Supply Current -IS Supply Current +IOS Output Short Circuit Current -IOS Output Short Circuit Current 14 -14 VS = ± 15V VS = ± 15V mA 1 mA 1 -57 -13 mA 1, 3 -40 -6 mA 2 13 57 mA 1, 3 6 40 mA 2 Unit Subgroups V/µs 7 8A, 8B AC Parameters The following conditions apply, unless otherwise specified: Symbol SR Parameter Slew Rate VS = ± 15V, VCM = 0V, RS = 0Ω, RL = Open Conditions Notes Min Max VI = -5V to +5V, AV=1 RL = 2KΩ, CL = 100pF 8 5 V/µs VI = +5V to -5V, AV=1 RL = 2KΩ, CL = 100pF 8 V/µS 7 5 V/µS 8A, 8B 5 www.national.com LF147QML Notes: 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: 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 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 5: 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 6: Human body model, 1.5 kΩ in series with 100 pF. Note 7: Guaranteed by CMRR test Note 8: V/mV in units column is equivalent to K in datalog Typical Performance Characteristics Input Bias Current Input Bias Current 20122614 20122615 Positive Common-Mode Input Voltage Limit Supply Current 20122616 20122617 www.national.com 6 LF147QML Typical Performance Characteristics (Continued) Negative Common-Mode Input Voltage Limit Positive Current Limit 20122619 20122618 Negative Current Limit Output Voltage Swing 20122620 20122621 Output Voltage Swing Gain Bandwidth 20122623 20122622 7 www.national.com LF147QML Typical Performance Characteristics (Continued) Bode Plot Slew Rate 20122624 20122625 Undistorted Output Voltage Swing Distortion vs Frequency 20122626 20122627 Open Loop Frequency Response Common-Mode Rejection Ratio 20122629 20122628 www.national.com 8 LF147QML Typical Performance Characteristics (Continued) Power Supply Rejection Ratio Equivalent Input Noise Voltage 20122630 20122631 Open Loop Voltage Gain Output Impedance 20122633 20122632 Inverter Settling Time 20122634 9 www.national.com LF147QML Pulse Response RL=2 kΩ, CL=10 pF Large Signal Inverting Small Signal Inverting 20122606 Large Signal Non-Inverting 20122604 Small Signal Non-Inverting 20122607 20122605 Current Limit (RL=100Ω) 20122608 www.national.com 10 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 should be allowed to exceed the negative supply as this will cause large currents to flow which can result in a destroyed unit. 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. 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. 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. 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. 11 www.national.com LF147QML The LF147 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. Application Hints LF147QML Typical Applications Digitally Selectable Precision Attenuator 20122610 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 12 LF147QML Typical Applications (Continued) Long Time Integrator with Reset, Hold and Starting Threshold Adjustment 20122611 • VOUT starts from zero and is equal to the integral of the input voltage with respect to the threshold voltage: • Output starts when VIN ≥V TH • Switch S1 permits stopping and holding any output value • Switch S2 resets system to zero 13 www.national.com LF147QML Typical Applications (Continued) Universal State Variable Filter 20122612 For circuit shown: fO=3 kHz, fNOTCH=9.5 kHz Q=3.4 Passband gain: Highpass — 0.1 Bandpass — 1 Lowpass — 1 Notch — 10 • foxQ≤200 kHz • 10V peak sinusoidal output swing without slew limiting to 200 kHz • See LM148 data sheet for design equations www.national.com 14 Revision 04/18/05 A Section Originator New Release into corporate format 15 L. Lytle Changes 2 MDS datasheets converted into one Corp. datasheet format. MNLF147–X Rev. 0A2 and MDLF147–X Rev. 0A1, data sheets will be Archived www.national.com LF147QML Date Released LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) NS Package Number J14A 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. For the most current product information visit us at www.national.com. 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. 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