LM148QML Quad 741 Op Amps General Description Features The LM148 is a true quad LM741. It consists of four independent, high gain, internally compensated, low power operational amplifiers which have been designed to provide functional characteristics identical to those of the familiar LM741 operational amplifier. In addition the total supply current for all four amplifiers is comparable to the supply current of a single LM741 type op amp. Other features include input offset currents and input bias current which are much less than those of a standard LM741. Also, excellent isolation between amplifiers has been achieved by independently biasing each amplifier and using layout techniques which minimize thermal coupling. n n n n n n n n n n 741 op amp operating characteristics Class AB output stage — no crossover distortion Pin compatible with the LM124 Overload protection for inputs and outputs Low supply current drain: 0.6 mA/Amplifier Low input offset voltage: 1 mV Low input offset current: 4 nA Low input bias current 30 nA High degree of isolation between amplifiers: 120 dB Gain bandwidth product (unity gain): 1.0 MHz The LM148 can be used anywhere multiple LM741 or LM1558 type amplifiers are being used and in applications where amplifier matching or high packing density is required. Ordering Information NS PART NUMBER SMD PART NUMBER NS PACKAGE NUMBER PACKAGE DESCRIPTION LM148E/883 E20A 20LD LEADLESS CHIP CARRIER LM148J/883 J14A 14LD CERDIP Connection Diagrams 20120502 Top View See NS Package Number J14A © 2005 National Semiconductor Corporation DS201205 www.national.com LM148QML Quad 741 Op Amp February 2005 LM148QML Connection Diagrams (Continued) 20120548 Top View See NS Package Number E20A Schematic Diagram 20120501 * 1 pF in the LM149 www.national.com 2 LM148QML Absolute Maximum Ratings (Note 1) ± 22V ± 44V Supply Voltage Differential Input Voltage Output Short Circuit Duration(Note 2) Continuous Power Dissipation (Pd at 25˚C) (Note 3) 1100mW Thermal Resistance θJA CERDIP (Still Air) CERDIP (500LF/ Min Air flow) LCC (Still Air) LCC (500LF/ Min Air flow) 103˚C/W 52˚C/W 90˚C/W 66˚C/W θJC CERDIP LCC 19˚C/W 21˚C/W Maximum Junction Temperature (TjMAX) 150˚C Operating Temperature Range −55˚C ≤ TA ≤ +125˚C Storage Temperature Range −65˚C ≤ TA ≤ +150˚C Lead Temperature (Soldering, 10 sec.) Ceramic 300˚C ESD tolerance (Note 4) 500V 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 Electrical Characteristics DC PARAMETERS (The following conditions apply to all parameters, unless otherwise specified.) VCC = ± 15V, RS = 0Ω Symbol Parameter Conditions Notes Units Subgroups +5 mV 1 2,3 Min Max VIO Input Offset Voltage VCM = 0V, RS = 50 Ω −5 −6 +6 mV IIO Input Offset Current VCM = 0V −25 +25 nA 1 −75 +75 nA 2,3 1 100 nA 1 1 325 nA 2,3 ± IIB Rin Input Bias Current VCM = 0V 0.8 MΩ 1 PSRR+ Power Supply Rejection Ratio Input Resistance +VCC = +15V and +5V, −VCC = −15V, RS = 50Ω (Note 5) 77 dB 1, 2, 3 PSRR− Power Supply Rejection Ratio +VCC = +15V, −VCC = −15V and −5V, RS = 50Ω 77 dB 1, 2, 3 3 www.national.com LM148QML Electrical Characteristics (Continued) DC PARAMETERS (The following conditions apply to all parameters, unless otherwise specified.) VCC = ± 15V, RS = 0Ω Symbol Parameter Conditions Notes Min Max Units Subgroups Common Mode Rejection Ratio +VCM = ± 12V, RS = 50Ω 70 dB 1, 2, 3 IOS+ Short Circuit Current −55 −14 mA 1 IOS− Short Circuit Current 14 55 mA 1 ICC Power Supply Current 0.4 3.6 mA 1 0.4 4.5 mA 2, 3 50 V/mV 4 25 V/mV 5, 6 50 V/mV 4 25 V/mV 5, 6 RL = 10 kΩ +12 V 4, 5, 6 RL = 2kΩ +10 V 4, 5, 6 CMRR AVS+ Large Signal Voltage Gain VOUT = 0V to +10V, RL > 2 kΩ AVS− Large Signal Voltage Gain VOUT = 0V to −10V, RL > 2 kΩ Vout+ Vout− Output Voltage Swing Output Voltage Swing RL = 10 kΩ −12 V 4, 5, 6 RL = 2kΩ −10 V 4, 5, 6 Electrical Characteristics AC PARAMETERS (The following conditions apply to all parameters, unless otherwise specified.) VCC = ± 15V, AV = 1, RS = 0Ω Symbol Parameter Conditions Notes Min Max Units Subgroups V/µs 7, 8A, 8B MHz 7, 8A, 8B ± SR Slew Rate 0.2 GBW Gain Bandwidth Product 0.4 1.4 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: 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 3: The maximum power dissipation for these devices must be derated at elevated temperatures and is dicated by TJMAX, θJA, and the ambient temperature, TA. The maximum available power dissipation at any temperature is Pd = (TJMAX − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is less. Note 4: Human body model, 1.5 kΩ in series with 100 pF Note 5: Parameter Guaranteed, Not Tested. Cross Talk Test Circuit VS = ± 15V 20120506 www.national.com 20120507 4 LM148QML Cross Talk Test Circuit VS = ± 15V (Continued) 20120543 5 www.national.com LM148QML Typical Performance Characteristics Supply Current Input Bias Current 20120523 20120524 Voltage Swing Positive Current Limit 20120525 20120526 Negative Current Limit Output Impedance 20120528 20120527 www.national.com 6 LM148QML Typical Performance Characteristics (Continued) Common-Mode Rejection Ratio Open Loop Frequency Response 20120529 20120530 Bode Plot LM148 Large Signal Pulse Response (LM148) 20120533 20120531 Small Signal Pulse Response (LM148) Undistorted Output Voltage Swing 20120535 20120537 7 www.national.com LM148QML Typical Performance Characteristics (Continued) Gain Bandwidth Slew Rate 20120538 20120539 Inverting Large Signal Pulse Response (LM148) Input Noise Voltage and Noise Current 20120541 20120542 Positive Common-Mode Input Voltage Limit Negative Common-Mode Input Voltage Limit 20120505 20120543 www.national.com 8 The LM148 series are quad low power LM741 op amps. In the proliferation of quad op amps, these are the first to offer the convenience of familiar, easy to use operating characteristics of the LM741 op amp. In those applications where LM741 op amps have been employed, the LM148 series op amps can be employed directly with no change in circuit performance. As with most amplifiers, care should be taken 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 “pickup” and maximize the frequency of the feedback pole which capacitance from the input to ground creates. The package pin-outs are such that the inverting input of each amplifier is adjacent to its output. In addition, the amplifier outputs are located in the corners of the package which simplifies PC board layout and minimizes package related capacitive coupling between amplifiers. The input characteristics of these amplifiers allow differential input voltages which can exceed the supply voltages. In addition, if either of the input voltages is within the operating common-mode range, the phase of the output remains correct. If the negative limit of the operating common-mode range is exceeded at both inputs, the output voltage will be positive. For input voltages which greatly exceed the maximum supply voltages, either differentially or common-mode, resistors should be placed in series with the inputs to limit the current. 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 six 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. Like the LM741, these amplifiers can easily drive a 100 pF capacitive load throughout the entire dynamic output voltage and current range. However, if very large capacitive loads must be driven by a non-inverting unity gain amplifier, a resistor should be placed between the output (and feedback Typical Applications—LM148 One Decade Low Distortion Sinewave Generator 20120508 fMAX = 5 kHz, THD ≤ 0.03% R1 = 100k pot. C1 = 0.0047 µF, C2 = 0.01 µF, C3 = 0.1 µF, R2 = R6 = R7 = 1M, R3 = 5.1k, R4 = 12Ω, R5 = 240Ω, Q = NS5102, D1 = 1N914, D2 = 3.6V avalanche diode (ex. LM103), VS = ± 15V A simpler version with some distortion degradation at high frequencies can be made by using A1 as a simple inverting amplifier, and by putting back to back zeners in the feedback loop of A3. 9 www.national.com LM148QML connection) and the capacitance to reduce the phase shift resulting from the capacitive loading. The output current of each amplifier in the package is limited. Short circuits from an output to either ground or the power supplies will not destroy the unit. However, if multiple output shorts occur simultaneously, the time duration should be short to prevent the unit from being destroyed as a result of excessive power dissipation in the IC chip. Application Hints LM148QML Typical Applications—LM148 (Continued) Low Cost Instrumentation Amplifier 20120509 VS = ± 15V R = R2, trim R2 to boost CMRR Low Drift Peak Detector with Bias Current Compensation 20120510 Adjust R for minimum drift D3 low leakage diode D1 added to improve speed VS = ± 15V www.national.com 10 LM148QML Typical Applications—LM148 (Continued) Universal State-Variable Filter 20120511 Tune Q through R0, For predictable results: fO Q ≤ 4 x 104 Use Band Pass output to tune for Q 11 www.national.com LM148QML Typical Applications—LM148 (Continued) A 1 kHz 4 Pole Butterworth 20120512 Use general equations, and tune each section separately Q1stSECTION = 0.541, Q2ndSECTION = 1.306 The response should have 0 dB peaking A 3 Amplifier Bi-Quad Notch Filter 20120513 Ex: fNOTCH = 3 kHz, Q = 5, R1 = 270k, R2 = R3 = 20k, R4 = 27k, R5 = 20k, R6 = R8 = 10k, R7 = 100k, C1 = C2 = 0.001 µF Better noise performance than the state-space approach. www.national.com 12 LM148QML Typical Applications—LM148 (Continued) A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros) 20120514 R1C1 = R2C2 = t R'1C'1 = R'2C'2 = t' fC = 1 kHz, fS = 2 kHz, fp = 0.543, fZ = 2.14, Q = 0.841, f' P = 0.987, f' Z = 4.92, Q' = 4.403, normalized to ripple BW Use the BP outputs to tune Q, Q', tune the 2 sections separately R1 = R2 = 92.6k, R3 = R4 = R5 = 100k, R6 = 10k, R0 = 107.8k, RL = 100k, RH = 155.1k, R'1 = R'2 = 50.9k, R'4 = R'5 = 100k, R'6 = 10k, R'0 = 5.78k, R'L = 100k, R'H = 248.12k, R'f = 100k. All capacitors are 0.001 µF. Lowpass Response 20120515 13 www.national.com LM148QML Typical Simulation LM148, LM741 Macromodel for Computer Simulation 20120521 For more details, see IEEE Journal of Solid-State Circuits, Vol. SC-9, No. 6, December 1974 Note 6: o1 = 112IS = 8 x 10−16 Note 7: o2 = 144*C2 = 6 pF for LM149 20120522 www.national.com 14 LM148QML Revision History Section Date Released 02/08/05 Revision A Section Originator Changes New Release, Corporate format L. Lytle 1 MDS data sheet converted into one Corp. data sheet format. MNLM148-X, Rev. 2A2. MDS data sheet will be archived. 15 www.national.com LM148QML Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) NS Package Number J14A Leadless Chip Carrier(E) NS Package Number E20A www.national.com 16 LM148QML Quad 741 Op Amp Notes 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. 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. 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. 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