LM148/LM248/LM348 Quad 741 Op Amps LM149 Wide Band Decompensated (AV (MIN) General Description Features 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 LM149 series has the same features as the LM148 plus a gain bandwidth product of 4 MHz at a gain of 5 or greater. 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. n n n n n n n n n n n n = 5) 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 LM149 (AV 5): 4 MHz Schematic Diagram DS007786-1 * 1 pF in the LM149 (c) 2001 National Semiconductor Corporation DS007786 www.national.com LM148/LM149 Series Quad 741 Op Amp December 2000 LM148/LM149/LM248/LM348 Absolute Maximum Ratings (Note 4) If Military/Aerospace specified devices are required, Office/Distributors for availability and specifications. please contact the National Semiconductor Sales LM148/LM149 LM248 LM348 22V 18V 18V Supply Voltage 44V 36V 36V Differential Input Voltage Output Short Circuit Duration (Note 1) Continuous Continuous Continuous Power Dissipation (Pd at 25C) and Thermal Resistance (jA), (Note 2) -- -- 750 mW Molded DIP (N) Pd -- -- 100C/W jA 1100 mW 800 mW 700 mW Cavity DIP (J) Pd 110C/W 110C/W 110C/W JA 150C 110C 100C Maximum Junction Temperature (TjMAX) -25C TA +85C 0C TA +70C Operating Temperature Range -55C TA +125C Storage Temperature Range -65C to +150C -65C to +150C -65C to +150C Lead Temperature (Soldering, 10 sec.) Ceramic 300C 300C 300C Lead Temperature (Soldering, 10 sec.) Plastic 260C Soldering Information Dual-In-Line Package Soldering (10 seconds) 260C 260C 260C Small Outline Package Vapor Phase (60 seconds) 215C 215C 215C Infrared (15 seconds) 220C 220C 220C 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 Conditions LM148/LM149 Min LM248 Typ Max Min LM348 Typ Max Min Units Typ Max Input Offset Voltage TA = 25C, RS 10 k 1.0 5.0 1.0 6.0 1.0 6.0 mV Input Offset Current TA = 25C 4 25 4 50 4 50 nA Input Bias Current TA = 25C 30 100 30 200 30 200 nA Input Resistance TA = 25C Supply Current All Amplifiers TA = 25C, VS = 15V Large Signal Voltage Gain TA = 25C, VS = 15V 0.8 2.5 2.4 50 0.8 3.6 160 2.5 2.4 25 0.8 4.5 160 2.5 2.4 25 M 4.5 mA 160 V/mV dB VOUT = 10V, RL 2 k Amplifier to Amplifier TA = 25C, f = 1 Hz to 20 kHz Coupling (Input Referred) See Crosstalk -120 -120 -120 1.0 1.0 1.0 MHz LM149 Series 4.0 4.0 4.0 MHz LM148 Series (AV = 1) 60 60 60 degrees Test Circuit Small Signal Bandwidth LM148 Series TA = 25C Phase Margin TA = 25C Slew Rate LM149 Series (AV = 5) 60 60 60 degrees LM148 Series (AV = 1) 0.5 0.5 0.5 V/s 2.0 2.0 2.0 V/s 25 25 25 mA TA = 25C LM149 Series (AV = 5) Output Short Circuit Current TA = 25C Input Offset Voltage RS 10 k Input Offset Current www.national.com 2 6.0 7.5 7.5 mV 75 125 100 nA (Continued) (Note 3) Parameter Conditions LM148/LM149 Min VS = 15V, VOUT = 10V, LM348 Typ Max Min 325 500 Input Bias Current Large Signal Voltage Gain LM248 Typ Max Min 25 15 Units Typ Max 400 15 nA V/mV RL > 2 k Output Voltage Swing VS = 15V, RL = 10 k 12 13 10 12 12 RL = 2 k 12 13 10 12 12 12 13 10 12 12 V V Input Voltage Range VS = 15V Common-Mode Rejection RS 10 k 70 90 70 90 70 90 dB RS 10 k, 5V VS 15V 77 96 77 96 77 96 dB V Ratio Supply Voltage Rejection 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, jA, and the ambient temperature, TA. The maximum available power dissipation at any temperature is Pd = (TjMAX - TA)/jA or the 25C 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 and refer to RETS 149X for LM149 military specifications. Note 5: Human body model, 1.5 k in series with 100 pF. Cross Talk Test Circuit DS007786-6 DS007786-7 DS007786-43 VS = 15V The LM149 series has the same characteristics as the LM148 except it has been decompensated to provide a wider bandwidth. As a result the part requires a minimum gain of 5. 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. 3 www.national.com LM148/LM149/LM248/LM348 Electrical Characteristics LM148/LM149/LM248/LM348 Typical Performance Characteristics Supply Current Input Bias Current DS007786-23 Positive Current Limit Voltage Swing Negative Current Limit Output Impedance DS007786-28 DS007786-27 DS007786-26 Common-Mode Rejection Ratio DS007786-25 DS007786-24 Open Loop Frequency Response Bode Plot LM148 DS007786-31 DS007786-29 DS007786-30 www.national.com 4 Bode Plot LM149 LM148/LM149/LM248/LM348 Typical Performance Characteristics (Continued) Large Signal Pulse Response (LM148) Large Signal Pulse Response (LM149) DS007786-32 DS007786-33 Small Signal Pulse Response (LM148) Small Signal Pulse Response (LM149) DS007786-35 Gain Bandwidth DS007786-34 Undistorted Output Voltage Swing DS007786-36 Slew Rate DS007786-37 Inverting Large Signal Pulse Response (LM149) DS007786-38 DS007786-39 DS007786-40 5 www.national.com LM148/LM149/LM248/LM348 Typical Performance Characteristics Inverting Large Signal Pulse Response (LM148) (Continued) Input Noise Voltage and Noise Current DS007786-41 Positive Common-Mode Input Voltage Limit DS007786-42 DS007786-43 Negative Common-Mode Input Voltage Limit DS007786-5 Application Hints 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. 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 LM149 series has the same characteristics as the LM148 except it has been decompensated to provide a wider bandwidth. As a result the part requires a minimum gain of 5. 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. www.national.com 6 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. (Continued) 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 Typical Applications--LM148 One Decade Low Distortion Sinewave Generator DS007786-8 fMAX = 5 kHz, THD 0.03% R1 = 100k pot. C1 = 0.0047 F, C2 = 0.01 F, C3 = 0.1 F, R2 = R6 = R7 = 1M, R3 = 5.1k, R4 = 12, R5 = 240, 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/LM149/LM248/LM348 Application Hints LM148/LM149/LM248/LM348 Typical Applications--LM148 (Continued) Low Cost Instrumentation Amplifier DS007786-9 VS = 15V R = R2, trim R2 to boost CMRR Low Drift Peak Detector with Bias Current Compensation DS007786-10 Adjust R for minimum drift D3 low leakage diode D1 added to improve speed VS = 15V www.national.com 8 LM148/LM149/LM248/LM348 Typical Applications--LM148 (Continued) Universal State-Variable Filter DS007786-11 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/LM149/LM248/LM348 Typical Applications--LM148 (Continued) A 1 kHz 4 Pole Butterworth DS007786-12 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 DS007786-13 Ex: fNOTCH = 3 kHz, Q = 5, R1 = 270k, R2 = R3 = 20k, R4 = 27k, R5 = 20k, R6 = R8 = 10k, R7 = 100k, C1 = C2 = 0.001 F Better noise performance than the state-space approach. www.national.com 10 LM148/LM149/LM248/LM348 Typical Applications--LM148 (Continued) A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros) DS007786-14 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 F. Lowpass Response DS007786-15 11 www.national.com LM148/LM149/LM248/LM348 Typical Applications--LM149 Minimum Gain to Insure LM149 Stability The LM149 as a Unity Gain Inverter DS007786-16 DS007786-17 Non-inverting-Integrator Bandpass Filter DS007786-18 For stability purposes: R7 = R6/4, 10R6 = R5, CC = 10C fO(MAX), QMAX = 20 kHz, 10 Better Q sensitivity with respect to open loop gain variations than the state variable filter. R7, CC added for compensation www.national.com 12 LM148/LM149/LM248/LM348 Typical Applications--LM149 (Continued) Active Tone Control with Full Output Swing (No Slew Limiting at 20 kHz) DS007786-19 VS = 15V, VOUT(MAX) = 9.1 VRMS, fMAX = 20 kHz, THD 1% Duplicate the above circuit for stereo Max Bass Gain . (R1 + R2)/R1 Max Treble Gain . (R1 + 2R7)/R5 as shown: fL . 32 Hz, fLB . 320 Hz fH . 11 kHz, fHB . 1.1 Hz 13 www.national.com LM148/LM149/LM248/LM348 Typical Applications--LM149 (Continued) Triangular Squarewave Generator DS007786-20 Use LM125 for 15V supply The circuit can be used as a low frequency V/F for process control. Q1, Q3: KE4393, Q2, Q4: P1087E, D1-D4 = 1N914 www.national.com 14 LM148/LM149/LM248/LM348 Typical Simulation LM148, LM149, LM741 Macromodel for Computer Simulation DS007786-21 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 DS007786-22 15 www.national.com LM148/LM149/LM248/LM348 Connection Diagram DS007786-2 Top View Order Number LM148J, LM148J/883, LM149J/883, LM248J, LM348M, or LM348N See NS Package Number J14A, M14A or N14A LM148J is available per JM38510/11001 www.national.com 16 LM148/LM149/LM248/LM348 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number LM148J, LM148J/883, LM149J/883, LM248J NS Package Number J14A S.O. Package (M) Order Number LM348M or LM348MX NS Package Number M14A 17 www.national.com LM148/LM149 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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