TL082 TL082 Wide Bandwidth Dual JFET Input Operational Amplifier Literature Number: SNOSBW5B TL082 Wide Bandwidth Dual JFET Input Operational Amplifier General Description Features These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II™ technology). They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The TL082 is pin compatible with the standard LM1558 allowing designers to immediately upgrade the overall performance of existing LM1558 and most LM358 designs. n n n n n n n n n n n These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth. The devices also exhibit low noise and offset voltage drift. Typical Connection Internally trimmed offset voltage: Low input bias current: Low input noise voltage: Low input noise current: Wide gain bandwidth: High slew rate: Low supply current: High input impedance: Low total harmonic distortion: Low 1/f noise corner: Fast settling time to 0.01%: 15 mV 50 pA 16nV/√Hz 0.01 pA/√Hz 4 MHz 13 V/µs 3.6 mA 1012Ω ≤0.02% 50 Hz 2 µs Connection Diagram DIP/SO Package (Top View) 00835703 00835701 Order Number TL082CM or TL082CP See NS Package Number M08A or N08E Simplified Schematic 00835702 BI-FET II™ is a trademark of National Semiconductor Corp. © 2004 National Semiconductor Corporation DS008357 www.national.com TL082 Wide Bandwidth Dual JFET Input Operational Amplifier August 2000 TL082 Absolute Maximum Ratings (Note 1) Input Voltage Range (Note 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Output Short Circuit Duration Continuous Storage Temperature Range −65˚C to +150˚C Power Dissipation 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. 0˚C to +70˚C Tj(MAX) 150˚C Differential Input Voltage ± 30V DC Electrical Characteristics (Note 5) Parameter Conditions TL082C Min VOS Input Offset Voltage RS = 10 kΩ, TA = 25˚C Typ 5 Over Temperature ∆VOS/∆T Average TC of Input Offset 260˚C ESD rating to be determined. (Note 2) Operating Temperature Range Symbol Lead Temp. (Soldering, 10 seconds) ± 18V Supply Voltage ± 15V RS = 10 kΩ 10 Tj = 25˚C, (Notes 5, 6) 25 Units Max 15 mV 20 mV µV/˚C Voltage IOS Input Offset Current Tj ≤ 70˚C IB Input Bias Current Tj = 25˚C, (Notes 5, 6) RIN Input Resistance Tj = 25˚C AVOL Large Signal Voltage Gain VS = ± 15V, TA = 25˚C 50 Tj ≤ 70˚C 25 200 pA 4 nA 400 pA 8 nA 1012 Ω 100 V/mV VO = ± 10V, RL = 2 kΩ Over Temperature 15 V/mV VO Output Voltage Swing VS = ± 15V, RL = 10 kΩ VCM Input Common-Mode Voltage VS = ± 15V ± 12 ± 11 −12 V CMRR Common-Mode Rejection Ratio RS ≤ 10 kΩ 70 100 dB PSRR Supply Voltage Rejection Ratio (Note 7) 70 100 IS Supply Current Range www.national.com ± 13.5 V +15 V 3.6 2 dB 5.6 mA Symbol TL082 AC Electrical Characteristics (Note 5) Parameter Conditions TL082C Min Amplifier to Amplifier Coupling TA = 25˚C, f = 1Hz- Typ Units Max −120 dB 20 kHz (Input Referred) SR Slew Rate VS = ± 15V, TA = 25˚C 13 V/µs GBW Gain Bandwidth Product VS = ± 15V, TA = 25˚C 4 MHz en Equivalent Input Noise Voltage TA = 25˚C, RS = 100Ω, 25 nV/√Hz in Equivalent Input Noise Current Tj = 25˚C, f = 1000 Hz 0.01 pA/√Hz THD Total Harmonic Distortion AV = +10, RL = 10k, VO = 20 Vp − p, BW = 20 Hz−20 kHz < 0.02 % 8 f = 1000 Hz Note 2: For operating at elevated temperature, the device must be derated based on a thermal resistance of 115˚C/W junction to ambient for the N package. Note 3: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage. Note 4: The power dissipation limit, however, cannot be exceeded. Note 5: These specifications apply for VS = ± 15V and 0˚C ≤TA ≤ +70˚C. VOS, IB and IOS are measured at VCM = 0. Note 6: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, Tj. Due to the limited production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation, PD. Tj = TA + θjA PD where θjA is the thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum. Note 7: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice. VS = ± 6V to ± 15V. Typical Performance Characteristics Input Bias Current Input Bias Current 00835719 00835718 3 www.national.com TL082 Typical Performance Characteristics (Continued) Positive Common-Mode Input Voltage Limit Supply Current 00835721 00835720 Negative Common-Mode Input Voltage Limit Positive Current Limit 00835723 00835722 Negative Current Limit Voltage Swing 00835725 00835724 www.national.com 4 TL082 Typical Performance Characteristics (Continued) Output Voltage Swing Gain Bandwidth 00835726 00835727 Bode Plot Slew Rate 00835729 00835728 Undistorted Output Voltage Swing Distortion vs Frequency 00835730 00835731 5 www.national.com TL082 Typical Performance Characteristics (Continued) Open Loop Frequency Response Common-Mode Rejection Ratio 00835733 00835732 Power Supply Rejection Ratio Equivalent Input Noise Voltage 00835734 00835735 Open Loop Voltage Gain (V/V) Output Impedance 00835736 www.national.com 00835737 6 TL082 Typical Performance Characteristics (Continued) Inverter Setting Time 00835738 Pulse Response Large Signal Inverting Small Signal Inverting 00835708 00835706 Large Signal Non-Inverting Small Signal Non-Inverting 00835709 00835707 7 www.national.com TL082 Pulse Response (Continued) Current Limit (RL = 100Ω) 00835710 The amplifiers will drive a 2 kΩ load resistance to ± 10V over the full temperature range of 0˚C to +70˚C. If the amplifier is forced to drive heavier load currents, however, an increase in input offset voltage may occur on the negative voltage swing and finally reach an active current limit on both positive and negative swings. Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed unit. Because these amplifiers are JFET rather than MOSFET input op amps they do not require special handling. As with most amplifiers, care should be taken with 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 “pick-up” and maximize the frequency of the feedback pole by minimizing the capacitance from the input to ground. Application Hints These devices are op amps with an internally trimmed input offset voltage and JFET input devices (BI-FET II). These JFETs have large reverse breakdown voltages from gate to source and drain eliminating the need for clamps across the inputs. Therefore, large differential input voltages can easily be accommodated without a large increase in input current. The maximum differential input voltage is independent of the supply voltages. However, neither of the input voltages should be allowed to exceed the negative supply as this will cause large currents to flow which can result in a destroyed unit. Exceeding the negative common-mode limit on either input will cause a reversal of the phase to the output and force the amplifier output to the corresponding high or low state. Exceeding the negative common-mode limit on both inputs will force the amplifier output to a high state. In neither case does a latch occur since raising the input back within the common-mode range again puts the input stage and thus the amplifier in a normal operating mode. Exceeding the positive common-mode limit on a single input will not change the phase of the output; however, if both inputs exceed the limit, the output of the amplifier will be forced to a high state. The amplifiers will operate with a common-mode input voltage equal to the positive supply; however, the gain bandwidth and slew rate may be decreased in this condition. When the negative common-mode voltage swings to within 3V of the negative supply, an increase in input offset voltage may occur. Each amplifier is individually biased by a zener reference which allows normal circuit operation on ± 6V power supplies. Supply voltages less than these may result in lower gain bandwidth and slew rate. www.national.com 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 6 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. 8 TL082 Detailed Schematic 00835711 Typical Applications Three-Band Active Tone Control 00835712 9 www.national.com TL082 Typical Applications (Continued) 00835713 • All potentiometers are linear taper • Use the LF347 Quad for stereo applications Note 8: All controls flat. Note 9: Bass and treble boost, mid flat. Note 10: Bass and treble cut, mid flat. Note 11: Mid boost, bass and treble flat. Note 12: Mid cut, bass and treble flat. Improved CMRR Instrumentation Amplifier 00835714 C and are separate isolated grounds Matching of R2’s, R4’s and R5’s control CMRR With AVT = 1400, resistor matching = 0.01%: CMRR = 136 dB • Very high input impedance • Super high CMRR www.national.com 10 TL082 Typical Applications (Continued) Fourth Order Low Pass Butterworth Filter 00835715 Fourth Order High Pass Butterworth Filter 00835716 11 www.national.com TL082 Typical Applications (Continued) Ohms to Volts Converter 00835717 www.national.com 12 TL082 Physical Dimensions inches (millimeters) unless otherwise noted Order Number TL082CM NS Package M08A Order Number TL082CP NS Package N08E 13 www.national.com TL082 Wide Bandwidth Dual JFET Input Operational Amplifier 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. 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