AME140 Lab #4 ---Basic OP-AMP circuits
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1 AME140 Lab #4 ---Basic OP-AMP circuits I. General Description of 741 Op-Amp Fig. 1 shows the pinouts for the 741 operational amplifier. This inexpensive chip (~30 ea.) is the workhorse of many practical circuits and you will benefit from knowing how to use it. The 741 requires bipolar DC (typically, ±12 v) connected to the +Vcc and -Vcc pins. The inverting and non-inverting inputs are labeled +in & -in. The 741 is well-protected by internal, current-limiting circuitry; nevertheless, for your personal safety, make sure never to reverse the DC supply connections and never to connect the output pin to ground. The 741 data sheet also cites limits on the maximum voltage at the output. II. Experimental set-up and general advice To power the 741, the +Vcc and -Vcc pins are connected to a bipolar DC supply as shown in Fig. 2. The midpoint between the +12 and -12 volt potentials, called the power supply common, is connected to ground and all voltages are measured with respect to it. Operate the voltage supply in the "independent" mode. First, set both current controls (A & B) to about the midpoint and then adjust the voltage levels to 12 volts using the voltage control knobs, using the meter mode switch to read the A and B voltages. 1
2 Here are some hints for breadboarding op-amp circuits: Do all wiring with the DC power and the signal generator turned off or disconnected! Wire all ground connections to one common point. This method, called "star grounding," minimizes ground loop noise. Double-check your wiring job before applying power. Keep an eye on the board when you first turn it on. If the op-amp gets warm or hot, TURN OFF THE POWER IMMEDIATELY! Ask a TA to help you check the circuit before turning power on again. Always turn on the +Vcc and -Vcc supply voltages first, before applying the signal voltage. Always turn off the input signal before turning off the DC power. Never drive the ±in terminals with a voltage exceeding the ±Vcc supply voltages. If unexpected oscillation is observed in your op-amp circuit, check first the polarity of input signal, particularly the feedback path, and make sure they are wired to the correct input terminal. III. Experimental procedures Part A. Assemble the circuit shown in Fig. 3 at right using Ro = 3.9 kω (±10%). Short both input terminals (±in) to ground and then use your scope to measure the output voltage Vo. Remember to use the dc-coupled scope input mode to perform any DC voltage measurements of this type. Is this voltage zero? Can you explain the result? Figure 3 2
3 Part B. Change the circuit to the arrangement shown in Fig. 4, still using a 3.9 kω load resistor. Apply a triangular waveform at 100 Hz with amplitude of 2 v peak-to-peak to the non-inverting terminal: +in. Display both the input and output voltage signals on the oscilloscope. Carefully sketch a full period of the waveforms observed. Repeat this procedure for a triangle waveform of amplitude 0.5 v (p-p). HINT: The output is unchanged, i.e., a square wave function. Why is this so? Figure 4 Part C. Now set up the simple non-inverting voltage follower circuit that was discussed in lecture and is shown in Fig. 5. Again use a 3.9 kω load resistor. Apply a 2 volt peak-to-peak triangular wave with the frequency adjusted to 1000 Hz at the +in terminal and display both this input signal and the output Vo(t) on the scope. Use the ideal op-amp circuit model to verify your experimental results. Next, replace the 3.9kΩ load resistor with smaller load resistors: 1 kω, 470 Ω, 220 Ω) and observe the output waveform for the same 2 volt peak-to-peak triangular wave input. How does the voltage follower perform with these smaller load resistors? Is there evidence of loading, that is, reduced gain? Figure 5 3
4 Part D. An inverting amplifier: Design a simple inverting amplifier with the configuration of Fig. 6 having a voltage gain K = R2/R1=10 by selecting a set of appropriate values for resistors R1and R2. When defining these values, make sure no more than 1mA of current drawn from Vi. Build your circuit and test it using a sinusoidal input with a peak-to-peak value of 0.2V and an oscillation frequency of 100Hz. Use the dual trace oscilloscope to confirm that your circuit is an inverting amplifier. Measure and record your input and output voltage and draw the waveform. Figure 6 Part E. A non-inverting amplifier: Design a simple non-inverting amplifier with the configuration of Fig. 7 having voltage gain K =20 by choosing a set of appropriate values for R1 and R2. Build your circuit and test it using a sinusoidal input with a peak-to-peak value of 0.2V and an oscillation frequency of 100Hz. Use the oscilloscope to confirm that your circuit is an inverting amplifier. Measure and record your input and output voltage and draw the waveform. Figure 7 4
5 LM741 Operational Amplifier General Description The LM741 series are general purpose operational amplifiers which feature improved performance over industry standards like the LM709. They are direct, plug-in replacements for the 709C, LM201, MC1439 and 748 in most applications. The amplifiers offer many features which make their application nearly foolproof: overload protection on the input and Connection Diagrams Metal Can Package output, no latch-up when the common mode range is exceeded, as well as freedom from oscillations. The LM741C is identical to the LM741/LM741A except that the LM741C has their performance guaranteed over a 0 C to +70 C temperature range, instead of 55 C to +125 C. Features Dual-In-Line or S.O. Package August 2000 LM741 Operational Amplifier Note 1: LM741H is available per JM38510/10101 Order Number LM741H, LM741H/883 (Note 1), LM741AH/883 or LM741CH See NS Package Number H08C Ceramic Flatpak Order Number LM741J, LM741J/883, LM741CN See NS Package Number J08A, M08A or N08E Order Number LM741W/883 See NS Package Number W10A Typical Application Offset Nulling Circuit National Semiconductor Corporation DS
6 LM741 Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 7) LM741A LM741 LM741C Supply Voltage ±22V ±22V ±18V Power Dissipation (Note 3) 500 mw 500 mw 500 mw Differential Input Voltage ±30V ±30V ±30V Input Voltage (Note 4) ±15V ±15V ±15V Output Short Circuit Duration Continuous Continuous Continuous Operating Temperature Range 55 C to +125 C 55 C to +125 C 0 C to +70 C Storage Temperature Range 65 C to +150 C 65 C to +150 C 65 C to +150 C Junction Temperature 150 C 150 C 100 C Soldering Information N-Package (10 seconds) 260 C 260 C 260 C J- or H-Package (10 seconds) 300 C 300 C 300 C M-Package Vapor Phase (60 seconds) 215 C 215 C 215 C Infrared (15 seconds) 215 C 215 C 215 C See AN-450 Surface Mounting Methods and Their Effect on Product Reliability for other methods of soldering surface mount devices. ESD Tolerance (Note 8) 400V 400V 400V Electrical Characteristics (Note 5) Parameter Conditions LM741A LM741 LM741C Units Min Typ Max Min Typ Max Min Typ Max Input Offset Voltage T A = 25 C R S 10 kω mv R S 50Ω mv T AMIN T A T AMAX R S 50Ω 4.0 mv R S 10 kω mv Average Input Offset 15 µv/ C Voltage Drift Input Offset Voltage T A = 25 C, V S = ±20V ±10 ±15 ±15 mv Adjustment Range Input Offset Current T A = 25 C na T AMIN T A T AMAX na Average Input Offset 0.5 na/ C Current Drift Input Bias Current T A = 25 C na T AMIN T A T AMAX µa Input Resistance T A = 25 C, V S = ±20V MΩ T AMIN T A T AMAX, 0.5 MΩ V S = ±20V Input Voltage Range T A = 25 C ±12 ±13 V T AMIN T A T AMAX ±12 ±13 V 2
7 Electrical Characteristics (Note 5) (Continued) Parameter Conditions LM741A LM741 LM741C Units Min Typ Max Min Typ Max Min Typ Max Large Signal Voltage Gain T A = 25 C, R L 2kΩ V S = ±20V, V O = ±15V 50 V/mV V S = ±15V, V O = ±10V V/mV T AMIN T A T AMAX, R L 2kΩ, V S = ±20V, V O = ±15V 32 V/mV V S = ±15V, V O = ±10V V/mV V S = ±5V, V O = ±2V 10 V/mV Output Voltage Swing V S = ±20V R L 10 kω ±16 V R L 2kΩ ±15 V V S = ±15V R L 10 kω ±12 ±14 ±12 ±14 V R L 2kΩ ±10 ±13 ±10 ±13 V Output Short Circuit T A = 25 C ma Current T AMIN T A T AMAX ma Common-Mode T AMIN T A T AMAX Rejection Ratio R S 10 kω, V CM = ±12V db R S 50Ω, V CM = ±12V db Supply Voltage Rejection T AMIN T A T AMAX, Ratio V S = ±20V to V S = ±5V R S 50Ω db R S 10 kω db Transient Response T A = 25 C, Unity Gain Rise Time µs Overshoot % Bandwidth (Note 6) T A = 25 C MHz Slew Rate T A = 25 C, Unity Gain V/µs Supply Current T A = 25 C ma Power Consumption T A = 25 C V S = ±20V mw V S = ±15V mw LM741A V S = ±20V T A =T AMIN 165 mw T A =T AMAX 135 mw LM741 V S = ±15V T A =T AMIN mw T A =T AMAX mw LM741 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. 3
8 LM741 Electrical Characteristics (Note 5) (Continued) Note 3: For operation at elevated temperatures, these devices must be derated based on thermal resistance, and T j max. (listed under Absolute Maximum Ratings ). T j =T A +(θ ja P D ). Thermal Resistance Cerdip (J) DIP (N) HO8 (H) SO-8 (M) θ ja (Junction to Ambient) 100 C/W 100 C/W 170 C/W 195 C/W θ jc (Junction to Case) N/A N/A 25 C/W N/A Note 4: For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage. Note 5: Unless otherwise specified, these specifications apply for V S = ±15V, 55 C T A +125 C (LM741/LM741A). For the LM741C/LM741E, these specifications are limited to 0 C T A +70 C. Note 6: Calculated value from: BW (MHz) = 0.35/Rise Time(µs). Note 7: For military specifications see RETS741X for LM741 and RETS741AX for LM741A. Note 8: Human body model, 1.5 kω in series with 100 pf. Schematic Diagram
9 Physical Dimensions inches (millimeters) unless otherwise noted LM741 Metal Can Package (H) Order Number LM741H, LM741H/883, LM741AH/883, LM741AH-MIL or LM741CH NS Package Number H08C 5
10 LM741 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Dual-In-Line Package (J) Order Number LM741J/883 NS Package Number J08A Dual-In-Line Package (N) Order Number LM741CN NS Package Number N08E 6
11 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LM741 Operational Amplifier 10-Lead Ceramic Flatpak (W) Order Number LM741W/883, LM741WG-MPR or LM741WG/883 NS Package Number W10A 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 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 certifies that the products and packing materials 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. National Semiconductor Americas Customer Support Center new.feedback@nsc.com Tel: National Semiconductor Europe Customer Support Center Fax: +49 (0) europe.support@nsc.com Deutsch Tel: +49 (0) English Tel: +44 (0) Français Tel: +33 (0) National Semiconductor Asia Pacific Customer Support Center ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: jpn.feedback@nsc.com Tel:
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