UAF42 UAF42 UAF42 www.ti.com SBFS002B–JULY1992–REVISEDOCTOBER2010 UNIVERSAL ACTIVE FILTER CheckforSamples:UAF42 FEATURES DESCRIPTION 1 • VERSATILE: The UAF42 is a universal active filter that can be 2 – Low-Pass,High-Pass configured for a wide range of low-pass, high-pass, and band-pass filters. It uses a classic state-variable – Band-Pass,Band-Reject analogarchitecturewithaninvertingamplifierandtwo • SIMPLEDESIGNPROCEDURE integrators. The integrators include on-chip 1000pF • ACCURATEFREQUENCYANDQ: capacitors trimmed to 0.5%. This architecture solves one of the most difficult problems of active filter – IncludesOn-Chip1000pF ±0.5%Capacitors design—obtainingtighttolerance,low-losscapacitors. APPLICATIONS A DOS-compatible filter design program allows easy • TESTEQUIPMENT implementation of many filter types, such as Butterworth, Bessel, and Chebyshev. A fourth, • COMMUNICATIONSEQUIPMENT uncommitted FET-input op amp (identical to the other • MEDICALINSTRUMENTATION three) can be used to form additional stages, or for • DATAACQUISITIONSYSTEMS special filters such as band-reject and Inverse • MONOLITHICREPLACEMENTFORUAF41 Chebyshev. The classical topology of the UAF42 forms a time-continuous filter, free from the anomalies and switching noise associated with switched-capacitor filtertypes. The UAF42 is available in 14-pin plastic DIP and SOIC-16 surface-mount packages, specified for the –25°Cto+85°Ctemperaturerange. blank blank blank blank High-Pass Band-Pass Low-Pass Out Out Out R R 1000pF(1) 1000pF(1) V+ In 1 In 2 R R V- In 3 R = 50kW±0.5% GND NOTE:(1)±0.5%. 1 Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. Alltrademarksarethepropertyoftheirrespectiveowners. 2 PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©1992–2010,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters.

UAF42 SBFS002B–JULY1992–REVISEDOCTOBER2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage. ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications. ABSOLUTE MAXIMUM RATINGS(1) Overoperatingfree-airtemperaturerangeunlessotherwisenoted. UAF42 UNIT PowerSupplyVoltage ±18 V InputVoltage ±V ±0.7 V S OutputShort-Circuit Continuous OperatingTemperature –40to+85 °C StorageTemperature –40to+125 °C JunctionTemperature +125 °C (1) Stressesabovetheseratingsmaycausepermanentdamage.Exposuretoabsolutemaximumconditionsforextendedperiodmay degradedevicereliability.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyond thosespecifiedisnotsupported. ORDERINGINFORMATION(1) PRODUCT PACKAGE-LEAD PACKAGEDESIGNATOR PACKAGEMARKING UAF42AP PDIP-14 N UAF42AP UAF42APG4 UAF42AU SOIC-16 DW UAF42AU UAF42AUE4 (1) ForthemostcurrentpackageandorderinginformationseethePackageOptionAddendumattheendofthisdocument,orseetheTI websiteatwww.ti.com. PIN CONFIGURATIONS PPACKAGE UPACKAGE PDIP-14 SOIC-16 (TOPVIEW) (TOPVIEW) Low-Pass V 1 14 Frequency Adj O 2 Low-Pass V 1 16 Frequency Adj O 2 VIN3 2 13 High-Pass VO NC(1) 2 15 NC(1) V 3 12 V IN2 IN1 V 3 14 High-Pass V IN3 O Auxiliary Op Amp, +In 4 11 Ground V 4 13 V IN2 IN1 Auxiliary Op Amp,-In 5 10 V+ Auxiliary Op Amp, +In 5 12 Ground Auxiliary Op Amp, VO 6 9 V- Auxiliary Op Amp,-In 6 11 V+ Bandpass VO 7 8 Frequency Adj1 Auxiliary Op Amp, V 7 10 V- O Bandpass V 8 9 Frequency Adj O 1 NOTE:(1)NC=noconnection.Forbest performanceconnectallNCpinstoground tominimizeinter-leadcapacitance. 2 SubmitDocumentationFeedback Copyright©1992–2010,TexasInstrumentsIncorporated ProductFolderLink(s):UAF42

UAF42 www.ti.com SBFS002B–JULY1992–REVISEDOCTOBER2010 ELECTRICAL CHARACTERISTICS AtT =+25°C,andV =±15V,unlessotherwisenoted. A S UAF42AP,AU PARAMETER CONDITIONS MIN TYP MAX UNIT FILTERPERFORMANCE FrequencyRange,fn 0to100 kHz FrequencyAccuracy f=1kHz 1 % vsTemperature 0.01 %/°C MaximumQ 400 — Maximum(Q•Frequency)Product 500 kHz QvsTemperature (fO•Q)<104 0.01 %/°C (fO•Q)<105 0.025 %/°C QRepeatability (fO•Q)<105 2 % OffsetVoltage,Low-PassOutput ±5 mV ResistorAccuracy 0.5 1 % OFFSETVOLTAGE(1) InputOffsetVoltage ±0.5 ±5 mV vsTemperature ±3 mV/°C vsPowerSupply VS=±6Vto±18V 80 96 dB INPUTBIASCURRENT(1) InputBiasCurrent VCM=0V 10 50 pA InputOffsetCurrent VCM=0V 5 pA NOISE InputVoltageNoise NoiseDensity:f=10Hz 25 nV/√Hz NoiseDensity:f=10kHz 10 nV/√Hz VoltageNoise:BW=0.1Hzto10Hz 2 mVPP InputBiasCurrentNoise NoiseDensity:f=10kHz 2 fA/√Hz INPUTVOLTAGERANGE(1) Common-ModeInputRange ±11.5 V Common-ModeRejection VCM=±10V 80 96 dB INPUTIMPEDANCE(1) Differential 1013||2 Ω||pF Common-Mode 1013||6 Ω||pF OPEN-LOOPGAIN(1) Open-LoopVoltageGain VO=±10V,RL=2kΩ 90 126 dB FREQUENCYRESPONSE SlewRate 10 V/ms Gain-BandwidthProduct G=+1 4 MHz TotalHarmonicDistortion G=+1,f=1kHz 0.1 % OUTPUT(1) VoltageOutput RL=2kΩ ±11 ±11.5 V ShortCircuitCurrent ±25 mA (1) Specificationsapplytouncommittedopamp,A .ThethreeopampsformingthefilterareidenticaltoA butaretestedasacomplete 4 4 filter. Copyright©1992–2010,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLink(s):UAF42

UAF42 SBFS002B–JULY1992–REVISEDOCTOBER2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) AtT =+25°C,andV =±15V,unlessotherwisenoted. A S UAF42AP,AU PARAMETER CONDITIONS MIN TYP MAX UNIT POWERSUPPLY SpecifiedOperatingVoltage ±15 V OperatingVoltageRange ±6 ±18 V Current ±6 ±7 mA TEMPERATURERANGE Specified –25 +85 °C Operating –25 +85 °C Storage –40 +125 °C ThermalResistance,qJA 100 °C/W 4 SubmitDocumentationFeedback Copyright©1992–2010,TexasInstrumentsIncorporated ProductFolderLink(s):UAF42

UAF42 www.ti.com SBFS002B–JULY1992–REVISEDOCTOBER2010 APPLICATION INFORMATION The UAF42 is a monolithic implementation of the The basic building element of the most proven state-variable analog filter topology. This commonly-used filter types is the second-order device is pin-compatible with the popular UAF41 section. This section provides a complex-conjugate analogfilter,anditprovidesseveralimprovements. pair of poles. The natural frequency, w , and Q of the n pole pair determine the characteristic response of the The slew rate of the UAF42 has been increased to section. The low-pass transfer function is shown in 10V/ms, versus 1.6V/ms for the UAF41. Equation1: Frequency • Q product of the UAF42 has been w improved, and the useful natural frequency extended V (s) A 2 O = LP n w w by a factor of four to 100kHz. FET input op amps on V(s) s2+ s /Q + 2 I n n (1) the UAF42 provide very low input bias current. The monolithic construction of the UAF42 provides lower The high-pass transfer function is given by costandimprovedreliability. Equation2: V (s) A s2 DESIGN PROGRAM HP = wHP w V(s) s2+ s /Q + 2 I n n (2) Application report SBFA002 (available for download at www.ti.com) and a computer-aided design program The band-pass transfer function is calculated using also available from Texas Instruments, make it easy Equation3: w to design and implement many kinds of active filters. V (s) A ( /Q) s The DOS-compatible program guides you through the BP = BPw n w V(s) s2+ s /Q + 2 design process and automatically calculates I n n (3) componentvalues. A band-reject response is obtained by summing the Low-pass, high-pass, band-pass and band-reject low-pass and high-pass outputs, yielding the transfer (notch)filterscanbedesigned.Theprogramsupports functionshowninEquation4: the three most commonly-used all-pole filter types: V (s) A (s2+w 2) Butterworth, Chebyshev and Bessel. The less-familiar BR = BRw nw V(s) s2+ s /Q + 2 inverse Chebyshev is also supported, providing a I n n (4) smooth passband response with ripple in the stop The most common filter types are formed with one or band. more cascaded second-order sections. Each section With each data entry, the program automatically is designed for w and Q according to the filter type n calculates and displays filter performance. This (Butterworth, Bessel, Chebyshev, etc.) and cutoff feature allows a spreadsheet-like what-if design frequency. While tabulated data can be found in approach.Forexample,ausercanquicklydetermine, virtually any filter design text, the design program by trial and error, how many poles are required for a eliminatesthistediousprocedure. desired attenuation in the stopband. Gain/phase plots Second-order sections may be noninverting maybeviewedforanyresponsetype. (Figure 1) or inverting (Figure 2). Design equations for these two basic configurations are shown for reference. The design program solves these equations, providing complete results, including componentvalues. Copyright©1992–2010,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLink(s):UAF42

UAF42 SBFS002B–JULY1992–REVISEDOCTOBER2010 www.ti.com HP Out BP Out LP Out R R F1 F2 12 13 8 7 14 1 R 1 50kW R 2 50kW C1 C2 2 1000pF 1000pF 50kW R A A A G 1 2 3 V 3 IN R 4 50kW R UAF42 Q 11 Note: If R = 50kW, the external gain-setting G resistor can be eliminated by connecting VINto pin 2. Pin numbers are for DIP package. SOIC-16 pinout is different. Design Equations R 1 1 + R R 1. w2= 2 4. A = 2 n R R R C C LP 1 F1 F2 1 2 1 1 1 R + + G R R R G Q 4 R (R +R ) 4 G Q 1/2 2. Q= 1 + 1 +RGRRR12Q RR21RRFF12CC12 5. AHP= RR12 ALP= 11 + RR112 1 R + + G R R R G Q 4 1/2 R R R C 1 1 F1 1 3. QA = QA = A LP HP R BP R R C R 2 2 F2 2 4 6. A = BP R G Figure1. NoninvertingPole-Pair 6 SubmitDocumentationFeedback Copyright©1992–2010,TexasInstrumentsIncorporated ProductFolderLink(s):UAF42

UAF42 www.ti.com SBFS002B–JULY1992–REVISEDOCTOBER2010 HP Out BP Out LP Out R R R G F1 F2 V IN 12 13 8 7 14 1 R 1 50kW R 2 50kW C1 C2 2 1000pF 1000pF 50kW A A A 1 2 3 3 R 4 50kW R Q 11 Note: If R = 50kW, the external Q-setting resistor Q can be eliminated by connecting pin 2 to ground. Pin numbers are for DIP package. SOIC-16 pinout is different. Design Equations R R 1. w2= 2 4. A = 1 n R1RF1RF2C1C2 LP RG 1/2 R4 1 RF1C1 R2 R2 2. Q=1 + 5. A = A = R R R R C HP R LP R Q 1 1 1 1 2 F2 2 1 G + + R R R 1 2 G 1/2 R1 R1RF1C1 R4 1 3. QA = QA = A 6. A = 1 + LP HP R BP R R C BP R 2 2 F2 2 Q 1 1 1 R + + G R R R 1 2 G Figure2. InvertingPole-Pair Copyright©1992–2010,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLink(s):UAF42

UAF42 SBFS002B–JULY1992–REVISEDOCTOBER2010 www.ti.com REVISION HISTORY NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion. ChangesfromRevisionA(November,2007)toRevisionB Page • CorrectedpackagemarkinginformationshowninOrderingInformationtable .................................................................... 2 8 SubmitDocumentationFeedback Copyright©1992–2010,TexasInstrumentsIncorporated ProductFolderLink(s):UAF42

PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Top-Side Markings Samples (1) Drawing Qty (2) (3) (4) UAF42AP ACTIVE PDIP N 14 25 Green (RoHS CU NIPDAU N / A for Pkg Type UAF42AP & no Sb/Br) UAF42AP-1 OBSOLETE PDIP N 14 TBD Call TI Call TI UAF42APG4 ACTIVE PDIP N 14 25 Green (RoHS CU NIPDAU N / A for Pkg Type UAF42AP & no Sb/Br) UAF42AU ACTIVE SOIC DW 16 40 Green (RoHS CU NIPDAU Level-3-260C-168 HR -25 to 85 UAF42AU & no Sb/Br) UAF42AU-1 OBSOLETE SOIC DW 16 TBD Call TI Call TI UAF42AUE4 ACTIVE SOIC DW 16 40 Green (RoHS CU NIPDAU Level-3-260C-168 HR -25 to 85 UAF42AU & no Sb/Br) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2

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