LM348N

LM148/LM248/LM348 Series Quad 741 Op Amp November 2003 LM148/LM248/LM348 Quad 741 Op Amps General Description The LM148 series is a true quad 741. 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 741 operational amplifier. In addition the total supply current for all four amplifiers is comparable to the supply current of a single 741 type op amp. Other features include input offset currents and input bias current which are much less than those of a standard 741. Also, excellent isolation between amplifiers has been achieved by independently biasing each amplifier and using layout techniques which minimize thermal coupling. The LM148 can be used anywhere multiple 741 or 1558 type amplifiers are being used and in applications where amplifier matching or high packing density is required. For lower power refer to LF444. Features n 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 LM148 (unity gain): 1.0 MHz Schematic Diagram 00778601 * 1 pF in the LM149 © 2003 National Semiconductor Corporation DS007786 www.national.com LM148/LM248/LM348 Absolute Maximum Ratings (Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM148 Supply Voltage Differential Input Voltage Output Short Circuit Duration (Note 1) Power Dissipation (Pd at 25˚C) and Thermal Resistance (θjA), (Note 2) Molded DIP (N) Pd θjA Cavity DIP (J) Pd θJA Maximum Junction Temperature (TjMAX) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Ceramic Lead Temperature (Soldering, 10 sec.) Plastic Soldering Information Dual-In-Line Package Soldering (10 seconds) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds) 215˚C 220˚C 260˚C — — 1100 mW 110˚C/W 150˚C −55˚C ≤ TA ≤ +125˚C −65˚C to +150˚C 300˚C LM248 LM348 ± 22V ± 44V Continuous ± 18V ± 36V Continuous ± 18V ± 36V Continuous — — 800 mW 110˚C/W 110˚C −25˚C ≤ TA ≤ +85˚C −65˚C to +150˚C 300˚C 750 mW 100˚C/W 700 mW 110˚C/W 100˚C 0˚C ≤ TA ≤ +70˚C −65˚C to +150˚C 300˚C 260˚C 260˚C 215˚C 220˚C 260˚C 215˚C 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. ESD tolerance (Note 5) 500V 500V 500V Electrical Characteristics (Note 3) Parameter Input Offset Voltage Input Offset Current Input Bias Current Input Resistance Supply Current All Amplifiers Large Signal Voltage Gain Amplifier to Amplifier Coupling Small Signal Bandwidth Phase Margin Slew Rate Output Short Circuit Current Input Offset Voltage Input Offset Current www.national.com 2 Conditions TA = 25˚C, RS ≤ 10 kΩ TA = 25˚C TA = 25˚C TA = 25˚C TA = 25˚C, VS = ± 15V TA = 25˚C, VS = ± 15V VOUT = ± 10V, RL ≥ 2 kΩ TA = 25˚C, f = 1 Hz to 20 kHz (Input Referred) See Crosstalk Test Circuit TA = 25˚C, LM148 Series TA = 25˚C, LM148 Series (AV = 1) TA = 25˚C, LM148 Series (AV = 1) TA = 25˚C RS ≤ 10 kΩ 50 0.8 LM148 1.0 4 30 2.5 2.4 160 3.6 25 5.0 25 100 0.8 LM248 1.0 4 30 2.5 2.4 160 4.5 25 6.0 50 200 0.8 LM348 1.0 4 30 2.5 2.4 160 4.5 6.0 50 200 Units mV nA nA MΩ mA V/mV Min Typ Max Min Typ Max Min Typ Max −120 1.0 60 0.5 25 6.0 75 −120 1.0 60 0.5 25 7.5 125 −120 1.0 60 0.5 25 7.5 100 dB MHz degrees V/µs mA mV nA LM148/LM248/LM348 Electrical Characteristics (Note 3) Parameter Input Bias Current Large Signal Voltage Gain Output Voltage Swing Input Voltage Range Common-Mode Rejection Ratio Supply Voltage Rejection (Continued) Conditions LM148 325 LM248 500 15 15 LM348 400 Units nA V/mV V V V dB dB Min Typ Max Min Typ Max Min Typ Max VS = ± 15V, VOUT = ± 10V, RL > 2 kΩ VS = ± 15V, RL = 10 kΩ RL = 2 kΩ VS = ± 15V RS ≤ 10 kΩ RS ≤ 10 kΩ, ± 5V ≤ VS ≤ ± 15V 25 ± 12 ± 13 ± 10 ± 12 ± 12 70 77 90 96 ± 12 ± 13 ± 10 ± 12 ± 12 70 77 90 96 ± 12 ± 13 ± 10 ± 12 ± 12 70 77 90 96 Note 1: 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 2: 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 25˚C PDMAX, whichever is less. Note 3: These specifications apply for VS = ± 15V and over the absolute maximum operating temperature range (TL ≤ TA ≤ TH) unless otherwise noted. Note 4: Refer to RETS 148X for LM148 military specifications. Note 5: Human body model, 1.5 kΩ in series with 100 pF. Cross Talk Test Circuit VS = ± 15V 00778606 00778607 00778643 3 www.national.com LM148/LM248/LM348 Typical Performance Characteristics Supply Current Input Bias Current 00778623 00778624 Voltage Swing Positive Current Limit 00778625 00778626 Negative Current Limit Output Impedance 00778628 00778627 www.national.com 4 LM148/LM248/LM348 Typical Performance Characteristics Common-Mode Rejection Ratio (Continued) Open Loop Frequency Response 00778629 00778630 Bode Plot LM148 Large Signal Pulse Response (LM148) 00778631 00778633 Small Signal Pulse Response (LM148) Undistorted Output Voltage Swing 00778635 00778637 5 www.national.com LM148/LM248/LM348 Typical Performance Characteristics Gain Bandwidth (Continued) Slew Rate 00778638 00778639 Inverting Large Signal Pulse Response (LM148) Input Noise Voltage and Noise Current 00778641 00778642 Positive Common-Mode Input Voltage Limit Negative Common-Mode Input Voltage Limit 00778605 00778643 www.national.com 6 LM148/LM248/LM348 Application Hints The LM148 series are quad low power 741 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 741 op amp. In those applications where 741 op amps have been employed, the LM148 series op amps can be employed directly with no change in circuit performance. 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. 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 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. 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. 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. Typical Applications—LM148 One Decade Low Distortion Sinewave Generator 00778608 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. 7 www.national.com LM148/LM248/LM348 Typical Applications—LM148 (Continued) Low Cost Instrumentation Amplifier 00778609 VS = ± 15V R = R2, trim R2 to boost CMRR Low Drift Peak Detector with Bias Current Compensation 00778610 Adjust R for minimum drift D3 low leakage diode D1 added to improve speed VS = ± 15V www.national.com 8 LM148/LM248/LM348 Typical Applications—LM148 (Continued) Universal State-Variable Filter 00778611 Tune Q through R0, For predictable results: fO Q ≤ 4 x 104 Use Band Pass output to tune for Q 9 www.national.com LM148/LM248/LM348 Typical Applications—LM148 (Continued) A 1 kHz 4 Pole Butterworth 00778612 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 00778613 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 10 LM148/LM248/LM348 Typical Applications—LM148 (Continued) A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros) 00778614 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 00778615 11 www.national.com LM148/LM248/LM348 Typical Simulation LM148, LM741 Macromodel for Computer Simulation 00778621 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 00778622 www.national.com 12 LM148/LM248/LM348 Connection Diagram 00778602 Top View Order Number LM148J, LM148J/883, LM248J, LM348M, or LM348N See NS Package Number J14A, M14A or N14A LM148J is available per JM38510/11001 13 www.national.com LM148/LM248/LM348 Physical Dimensions unless otherwise noted inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number LM148J, LM148J/883, LM248J NS Package Number J14A S.O. Package (M) Order Number LM348M or LM348MX NS Package Number M14A www.national.com 14 LM148/LM248/LM348 Series Quad 741 Op Amp Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM348N 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. 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