LM201A

LM101A/LM201A/LM301A Operational Amplifiers August 2000 LM101A/LM201A/LM301A Operational Amplifiers General Description The LM101A series are general purpose operational amplifiers which feature improved performance over industry standards like the LM709. Advanced processing techniques make possible an order of magnitude reduction in input currents, and a redesign of the biasing circuitry reduces the temperature drift of input current. Improved specifications include: • Offset voltage 3 mV maximum over temperature (LM101A/LM201A) • Input current 100 nA maximum over temperature (LM101A/LM201A) • Offset current 20 nA maximum over temperature (LM101A/LM201A) • Guaranteed drift characteristics and output, no latch-up when the common mode range is exceeded, and freedom from oscillations and compensation with a single 30 pF capacitor. It has advantages over internally compensated amplifiers in that the frequency compensation can be tailored to the particular application. For example, in low frequency circuits it can be overcompensated for increased stability margin. Or the compensation can be optimized to give more than a factor of ten improvement in high frequency performance for most applications. In addition, the device provides better accuracy and lower noise in high impedance circuitry. The low input currents also make it particularly well suited for long interval integrators or timers, sample and hold circuits and low frequency waveform generators. Further, replacing circuits where matched transistor pairs buffer the inputs of conventional IC op amps, it can give lower offset voltage and a drift at a lower cost. The LM101A is guaranteed over a temperature range of −55˚C to +125˚C, the LM201A from −25˚C to +85˚C, and the LM301A from 0˚C to +70˚C. • Offsets guaranteed over entire common mode and supply voltage ranges • Slew rate of 10V/µs as a summing amplifier This amplifier offers many features which make its application nearly foolproof: overload protection on the input Fast AC/DC Converter 00775233 Note 1: Feedforward compensation can be used to make a fast full wave rectifier without a filter. © 2004 National Semiconductor Corporation DS007752 www.national.com LM101A/LM201A/LM301A Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM101A/LM201A Supply Voltage Differential Input Voltage Input Voltage (Note 3) Output Short Circuit Duration (Note 4) Operating Ambient Temp. Range TJ Max H-Package N-Package J-Package Power Dissipation at TA = 25˚C H-Package (Still Air) (400 LF/Min Air Flow) N-Package J-Package Thermal Resistance (Typical) θjA H-Package (Still Air) (400 LF/Min Air Flow) N Package J-Package (Typical) θjC H-Package Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Metal Can or Ceramic Plastic ESD Tolerance (Note 7) 300˚C 260˚C 2000V 25˚C/W −65˚C to +150˚C 165˚C/W 67˚C/W 135˚C/W 110˚C/W 500 mW 1200 mW 900 mW 1000 mW 150˚C 150˚C 150˚C LM301A ± 22V ± 30V ± 15V Continuous −55˚C to +125˚C (LM101A) −25˚C to +85˚C (LM201A) ± 18V ± 30V ± 15V Continuous 0˚C to +70˚C 100˚C 100˚C 100˚C 300 mW 700 mW 500 mW 650 mW 165˚C/W 67˚C/W 135˚C/W 110˚CmW 25˚C/W −65˚C to +150˚C 300˚C 260˚C 2000V Electrical Characteristics (Note 5) TA= TJ Parameter Input Offset Voltage Input Offset Current Input Bias Current Input Resistance Supply Current Large Signal Voltage Gain Input Offset Voltage Average Temperature Coefficient of Input Offset Voltage Input Offset Current Average Temperature Coefficient of Input Offset Current Input Bias Current 25˚C ≤ TA ≤ TMAX TMIN ≤ TA ≤ 25˚C 0.01 0.02 20 0.1 0.2 0.1 0.01 0.02 70 0.3 0.6 0.3 nA nA/˚C nA/˚C µA Conditions TA = 25˚C, RS ≤ 50 kΩ TA = 25˚C TA = 25˚C TA = 25˚C TA = 25˚C TA = 25˚C, VS = ± 15V VOUT = ± 10V, RL ≥ 2 kΩ RS ≤ 50 kΩ RS ≤ 50 kΩ 3.0 3.0 15 6.0 10 30 mV µV/˚C VS = ± 20V VS = ± 15V 50 160 25 1.5 LM101A/LM201A Min Typ 0.7 1.5 30 4.0 1.8 3.0 1.8 160 3.0 Max Min 2.0 10 75 0.5 LM301A Typ 2.0 3.0 70 2.0 Max 7.5 50 250 mV nA nA MΩ mA mA V/mV Units www.national.com 2 LM101A/LM201A/LM301A Electrical Characteristics (Note 5) TA= TJ Parameter Supply Current Large Signal Voltage Gain Output Voltage Swing Input Voltage Range Common-Mode Rejection Ratio Supply Voltage Rejection Ratio (Continued) LM101A/LM201A Min Typ 1.2 25 Max Min 2.5 15 LM301A Typ Max mA V/mV Units Conditions TA = TMAX, VS = ± 20V VS = ± 15V, VOUT = ± 10V RL ≥ 2k VS = ± 15V VS = ± 20V VS = ± 15V RS ≤ 50 kΩ RS ≤ 50 kΩ RL = 10 kΩ RL = 2 kΩ ± 12 ± 10 ± 15 80 80 ± 14 ± 13 +15, −13 96 96 ± 12 ± 10 ± 14 ± 13 V V V V dB dB ± 12 +15, −13 70 70 90 96 Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating ratings indicate for which the device is functional, but do no guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 3: For supply voltages less than ± 15V, the absolute maximum input voltage is equal to the supply voltage. Note 4: Continuous short circuit is allowed for case temperatures to 125˚C and ambient temperatures to 75˚C for LM101A/LM201A, and 70˚C and 55˚C respectively for LM301A. Note 5: Unless otherwise specified, these specifications apply for C1 = 30 pF, ± 5V ≤ VS ≤ ± 20V and −55˚C ≤ TA ≤ +125˚C (LM101A), ± 5V ≤ VS ≤ ± 20V and −25˚C ≤ TA ≤ +85˚C (LM201A), ± 5V ≤ VS ≤ ± 15V and 0˚C ≤ TA ≤ +70˚C (LM301A). Note 6: Refer to RETS101AX for LM101A military specifications and RETS101X for LM101 military specifications. Note 7: Human body model, 100 pF discharged through 1.5 kΩ. Typical Performance Characteristics LM101A/LM201A Input Voltage Range Output Swing 00775242 00775241 3 www.national.com LM101A/LM201A/LM301A Typical Performance Characteristics Voltage Gain LM101A/LM201A (Continued) 00775243 Guaranteed Performance Characteristics LM301A Input Voltage Range Output Swing 00775244 00775245 Voltage Gain 00775246 www.national.com 4 LM101A/LM201A/LM301A Typical Performance Characteristics Supply Current Voltage Gain 00775247 00775248 Maximum Power Dissipation Input Current, LM101A/LM201A/LM301A 00775249 00775250 Current Limiting Input Noise Voltage 00775251 00775252 5 www.national.com LM101A/LM201A/LM301A Typical Performance Characteristics Input Noise Current (Continued) Common Mode Rejection 00775253 00775254 Power Supply Rejection Closed Loop Output Impedance 00775255 00775256 www.national.com 6 LM101A/LM201A/LM301A Typical Performance Characteristics for Various Compensation Circuits (Note 9) Single Pole Compensation Two Pole Compensation 00775208 00775212 CS= 30 pF CS= 30 pF C2 = 10 C1 Feedforward Compensation Open Loop Frequency Response 00775216 00775209 fo= 3 MHz Open Loop Frequency Response Open Loop Frequency Response 00775213 00775217 7 www.national.com LM101A/LM201A/LM301A Typical Performance Characteristics for Various Compensation Circuits (Note 9) (Continued) Large Signal Frequency Response Large Signal Frequency Response 00775210 00775214 Large Signal Frequency Response Voltage Follower Pulse Response 00775218 00775211 Voltage Follower Pulse Response Inverter Pulse Response 00775215 00775219 www.national.com 8 LM101A/LM201A/LM301A Typical Applications (Note 9) Variable Capacitance Multiplier Inverting Amplifier with Balancing Circuit 00775220 00775223 †May be zero or equal to parallel combination of R1 and R2 for minimum Simulated Inductor offset. Sine Wave Oscillator 00775221 L . R1 R2 C1 RS = R2 RP = R1 Fast Inverting Amplifier with High Input Impedance 00775224 fo = 10 kHz Integrator with Bias Current Compensation 00775222 00775225 *Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over −55˚C to +125˚C temperature range. 9 www.national.com LM101A/LM201A/LM301A Application Hints (Note 9) Protecting Against Gross Fault Conditions 00775226 *Protects input †Protects output ‡ Protects output — not needed when R4 is used. Compensating for Stray Input Capacitances or Large Feedback Resistor 00775227 Isolating Large Capacitive Loads 00775228 Although the LM101A is designed for trouble free operation, experience has indicated that it is wise to observe certain www.national.com 10 precautions given below to protect the devices from abnormal operating conditions. It might be pointed out that the LM101A/LM201A/LM301A advice given here is applicable to practically any IC op amp, although the exact reason why may differ with different devices. When driving either input from a low-impedance source, a limiting resistor should be placed in series with the input lead to limit the peak instantaneous output current of the source to something less than 100 mA. This is especially important when the inputs go outside a piece of equipment where they could accidentally be connected to high voltage sources. Large capacitors on the input (greater than 0.1 µF) should be treated as a low source impedance and isolated with a resistor. Low impedance sources do not cause a problem unless their output voltage exceeds the supply voltage. However, the supplies go to zero when they are turned off, so the isolation is usually needed. The output circuitry is protected against damage from shorts to ground. However, when the amplifier output is connected to a test point, it should be isolated by a limiting resistor, as test points frequently get shorted to bad places. Further, when the amplifer drives a load external to the equipment, it is also advisable to use some sort of limiting resistance to preclude mishaps. Precautions should be taken to insure that the power supplies for the integrated circuit never become reversed — even under transient conditions. With reverse voltages greater than 1V, the IC will conduct excessive current, fusing internal aluminum interconnects. If there is a possibility of this happening, clamp diodes with a high peak current rating should be installed on the supply lines. Reversal of the voltage between V+ and V− will always cause a problem, although reversals with respect to ground may also give difficulties in many circuits. The minimum values given for the frequency compensation capacitor are stable only for source resistances less than 10 kΩ, stray capacitances on the summing junction less than 5 pF and capacitive loads smaller than 100 pF. If any of these conditions are not met, it becomes necessary to overcompensate the amplifier with a larger compensation capacitor. Alternately, lead capacitors can be used in the feedback network to negate the effect of stray capacitance and large feedback resistors or an RC network can be added to isolate capacitive loads. Although the LM101A is relatively unaffected by supply bypassing, this cannot be ignored altogether. Generally it is necessary to bypass the supplies to ground at least once on every circuit card, and more bypass points may be required if more than five amplifiers are used. When feed-forward compensation is employed, however, it is advisable to bypass the supply leads of each amplifier with low inductance capacitors because of the higher frequencies involved. Typical Applications (Note 9) Standard Compensation and Offset Balancing Circuit 00775229 Fast Voltage Follower 00775231 Power Bandwidth: 15 kHz Slew Rate: 1V/µs Fast Summing Amplifier 00775230 Power Bandwidth: 250 kHz Small Signal Bandwiidth: 3.5 MHz Slew Rate: 10V/µs 11 www.national.com LM101A/LM201A/LM301A Typical Applications (Note 9) (Continued) Bilateral Current Source 00775232 R3 = R4 + R5 R1 = R2 Fast AC/DC Converter (Note 8) 00775233 Note 8: Feedforward compensation can be used to make a fast full wave rectifier without a filter. www.national.com 12 LM101A/LM201A/LM301A Typical Applications (Note 9) (Continued) Instrumentation Amplifier 00775234 R1 = R4; R2 = R3 *,† Matching determines CMRR. Integrator with Bias Current Compensation Voltage Comparator for Driving RTL Logic or High Current Driver 00775237 00775235 *Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over 0˚C to +70˚C temperature range. 13 www.national.com LM101A/LM201A/LM301A Typical Applications (Note 9) (Continued) Low Frequency Square Wave Generator 00775236 Low Drift Sample and Hold Voltage Comparator for Driving DTL or TTL Integrated Circuits 00775239 00775238 *Polycarbonate-dielectric capacitor www.national.com 14 LM101A/LM201A/LM301A Schematic (Note 9) 00775201 Note 9: Pin connections shown are for 8-pin packages. Connection Diagrams (Top View) Dual-In-Line Package Ceramic Flatpack Package 00775240 00775204 Order Number LM101AJ, LM101J/883 (Note 10), LM201AN or LM301AN See NS Package Number J08A or N08E Order Number LM101AW/883 or LM101W/883 See NS Package Number W10A 15 www.national.com LM101A/LM201A/LM301A Connection Diagrams View) (Continued) (Top Dual-In-Line Package Metal Can Package 00775203 00775202 Order Number LM101AJ-14/883 (Note 10) See NS Package Number J14A Note: Pin 4 connected to case. Order Number LM101AH, LM101AH/883 (Note 10), LM201AH or LM301AH See NS Package Number H08C Note 10: Available per JM38510/10103. www.national.com 16 LM101A/LM201A/LM301A Physical Dimensions unless otherwise noted inches (millimeters) Metal Can Package (H) Order Number LM101AH, LM101AH/883 LM201AH or LM301AH NS Package Number H08C 17 www.national.com LM101A/LM201A/LM301A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Dual-In-Line Package (J) Order Number LM101J/883 or LM101AJ NS Package Number J08A Ceramic Dual-In-Line Package (J) Order Number LM101AJ-14/883 NS Package Number J14A www.national.com 18 LM101A/LM201A/LM301A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM201AN or LM301AN NS Package Number N08E Ceramic Flatpack Package (W) Order Number LM101AW/883 or LM101W/883 NS Package Number W10A 19 www.national.com LM101A/LM201A/LM301A Operational Amplifiers Notes 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. 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. 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