LF444QML LF444QML Quad Low Power JFET Input Operational Amplifier Literature Number: SNOSAO9 LF444QML Quad Low Power JFET Input Operational Amplifier General Description Features The LF444 quad low power operational amplifier provides many of the same AC characteristics as the industry standard LM148 while greatly improving the DC characteristics of the LM148. The amplifier has the same bandwidth, slew rate, and gain (10 kΩ load) as the LM148 and only draws one fourth the supply current of the LM148. In addition the well matched high voltage JFET input devices of the LF444 reduce the input bias and offset currents by a factor of 10,000 over the LM148. The LF444 also has a very low equivalent input noise voltage for a low power amplifier. The LF444 is pin compatible with the LM148 allowing an immediate 4 times reduction in power drain in many applications. The LF444 should be used wherever low power dissipation and good electrical characteristics are the major considerations. ■ ■ ■ ■ ■ ■ ■ ■ ¼ supply current of a LM148: 250 μA/Amplifier (max) Low input bias current: 100 pA (max) High gain bandwidth: 1 MHz High slew rate: 1 V/μs Low noise voltage for low power Low input noise current High input impedance: 1012Ω High gain, VO = ±10V, RL = 10KΩ: 25K (min) Ordering Information NS Part Number SMD Part Number LF444MD/883 NS Package Number Package Description D14D 14LD Sidebraze Ceramic Dip Connection Diagram Dual-In-Line Package 20149502 Top View See NS Package Number D14D BI-FET® is a registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation 201495 www.national.com LF444QML Quad Low Power JFET Input Operational Amplifier October 16, 2010 LF444QML Simplified Schematic 1/4 Quad 20149501 Detailed Schematic 1/4 Quad 20149511 www.national.com 2 LF444QML Absolute Maximum Ratings (Note 1) Supply Voltage Differential Input Voltage Input Voltage Range (Note 4) Output Short Circuit Duration (Note 5) Power Dissipation (Note 2), (Note 3) TJmax ±18V ±30V ±15V Continuous 900 mW 150°C 100°C/W θJA (Typical) Operating Temperature Range −55°C ≤ TA ≤ 125°C −65°C ≤ TA ≤ 150°C Rating to be determined Storage Temperature Range ESD Tolerance (Note 6) Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup Description Temp (°C) 1 Static tests at +25 2 Static tests at +125 3 Static tests at -55 4 Dynamic tests at +25 5 Dynamic tests at +125 6 Dynamic tests at -55 7 Functional tests at +25 8A Functional tests at +125 8B Functional tests at -55 9 Switching tests at +25 10 Switching tests at +125 11 Switching tests at -55 12 Settling time at +25 13 Settling time at +125 14 Settling time at -55 3 www.national.com LF444QML LF444 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. Symbol VIO IIO +IIB Parameter Input Offset Voltage Input Offset Current Input Bias Current VS = ±15V, VCM = 0V, RS = 0Ω, RL = 0Ω Conditions Notes RS = 10KΩ RL = 10KΩ RL = 10KΩ -IIB Input Bias Current +AVS Large Signal Voltage Gain -AVS Large Signal Voltage Gain +VO Output Voltage Swing RL = 10KΩ, VI = +1V -VO Output Voltage Swing RL = 10KΩ, VI = -1V VCM Input Common Mode Voltage Range CMRR Common Mode Rejection Ratio RS = 10KΩ, VCM = ±9V PSRR+ Power Supply Rejection Ratio PSRR- Power Supply Rejection Ratio IS Supply Current RL = 10KΩ VO = 0 to +10V, Min Max Unit Subgroups -10 10 mV 1 -14 14 mV 2, 3 -0.05 0.05 nA 1 -10 10 nA 2 -0.10 0.10 nA 1 -20 20 nA 2 -0.10 0.10 nA 1 -20 20 nA 2 25 V/mV 1 15 V/mV 2, 3 25 V/mV 1 15 V/mV 2, 3 12 V 1, 2, 3 -12 V 1, 2, 3 -9 V 1, 2, 3 70 dB 1, 2, 3 VS = ±15V to VS = ±6V 70 dB 1, 2, 3 VS = ±15V to VS = ±6V 70 dB 1, 2, 3 1, 2, 3 RL = 10KΩ, RS = 10KΩ VO = 0 to -10V, RL = 10KΩ, RS = 10KΩ (Note 8) (Note 8) (Note 7) +IOS Output Short Circuit Current VI = 1V -IOS Output Short Circuit Current VI = -1V 9 1.0 mA -3.0 -20 mA 1 -3.0 -40 mA 2, 3 3.0 20 mA 1 3.0 40 mA 2, 3 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. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. Note 3: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate outside guaranteed limits. Note 4: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage. Note 5: 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 6: Human body model, 1.5 kΩ in series with 100 pF. Note 7: Parameter tested go-no-go only. Guaranteed by the CMRR test. Note 8: Datalog in K = V/mV. www.national.com 4 LF444QML Typical Performance Characteristics Input Bias Current Input Bias Current 20149512 20149513 Supply Current Positive Common-Mode Input Voltage Limit 20149514 20149515 Negative Common-Mode Input Voltage Limit Positive Current Limit 20149517 20149516 5 www.national.com LF444QML Negative Current Limit Output Voltage Swing 20149519 20149518 Output Voltage Swing Gain Bandwidth 20149521 20149520 Bode Plot Slew Rate 20149523 20149522 www.national.com 6 LF444QML Distortion vs Frequency Undistorted Output Voltage Swing 20149524 20149525 Open Loop Frequency Response Common-Mode Rejection Ratio 20149526 20149527 Power Supply Rejection Ratio Equivalent Input Noise Voltage 20149528 20149529 7 www.national.com LF444QML Open Loop Voltage Gain Output Impedance 20149530 20149531 Inverter Settling Time 20149532 www.national.com 8 LF444QML Pulse Response RL = 10 kΩ, CL = 10 pF Small Signal Inverting Small Signal Non-Inverting 20149506 20149507 Large Signal Inverting Large Signal Non-Inverting 20149508 20149509 9 www.national.com LF444QML The amplifiers will drive a 10 kΩ load resistance to ±10V over the full temperature range. 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. 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. 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. Application Hints This device is a quad low power op amp with JFET input devices ( BI-FET®). 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 force the output to a high state, potentially causing a reversal of phase to the output. 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 to allow normal circuit operation with power supplies of ±3.0V. Supply voltages less than these may degrade the common-mode rejection and restrict the output voltage swing. www.national.com 10 LF444QML Typical Application pH Probe Amplifier/Temperature Compensator 20149510 ***For R2 = 50kΩ, R4 = 330k ±1% For R2 = 100k, R4 = 75k ±1% For R2 = 200k, R4 = 56k ±1% **Polystyrene *Film resistor type RN60C To calibrate, insert probe in pH =7 solution. Set the “TEMPERATURE ADJUST” pot, R2, to correspond to the solution temperature: full clockwise for 0°C, and proportionately for intermediate temperatures, using a turns-counting dial. Then set “CALIBRATE” pot so output reads 7V. Typical probe = Ingold Electrodes #465-35 11 www.national.com LF444QML Revision History Date Released Revision 12/16/2010 A www.national.com Section Changes New release to corporate format 12 1 MDS datasheet converted to standard corporate format. MDS MNLF444M-X Rev 0AL will be archived. LF444QML Physical Dimensions inches (millimeters) unless otherwise noted See NS Package Number D14D 13 www.national.com LF444QML Quad Low Power JFET Input Operational Amplifier Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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