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19-1950; Rev 1; 4/01Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownFeatures 2.4V to 5.5V Supply Voltage Operation Versions with 5nA Complete Shutdown Available(MAX4467/MAX4468) Excellent Power-Supply Rejection Ratio: 112dB Excellent Common-Mode Rejection Ratio: 126dB High AVOL: 125dB (RL 100kΩ) Rail-to-Rail Outputs Low 24µA Quiescent Supply Current Gain Bandwidth Product:200kHz (MAX4465/MAX4467/MAX4469)600kHz AV 5 (MAX4466/MAX4468) Available in Space-Saving Packages5-Pin SC70 (MAX4465/MAX4466)8-Pin SOT23 (MAX4467/MAX4468/MAX4469)Ordering InformationPARTApplicationsMicrophone PreamplifiersHearing AidsCellular PhonesTEMP. RANGEPIN-PACKAGEMAX4465EXK-T-40 C to 85 C5 SC70-5MAX4465EUK-T-40 C to 85 C5 SOT23-5MAX4466EXK-T-40 C to 85 C5 SC70-5MAX4466EUK-T-40 C to 85 C5 SOT23-5Ordering Information continued at end of data sheet.Voice-Recognition SystemsTypical Operating CircuitDigital Dictation DevicesHeadsetsPortable ComputingVCCPin ConfigurationsSHDNRBIASMIC BIASTOP VIEWCBIASIN 1GND 25VCCRBIASIN OUTMAX4465MAX4466IN- OT23Pin Configurations continued at end of data sheet.MICROPHONECAPSULERFBRail-to-Rail is a registered trademark of Nippon Motorola, Ltd.MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITHCOMPLETE SHUTDOWNMaxim Integrated ProductsFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.Downloaded from Arrow.com.1MAX4465–MAX4469General DescriptionThe MAX4465–MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gainbandwidth product vs. supply current, and low voltageoperation in ultra-small packages. The MAX4465/MAX4467/MAX4469 are unity-gain stable and deliver a200kHz gain bandwidth from only 24µA of supply current. The MAX4466/MAX4468 are decompensated for aminimum stable gain of 5V/V and provide a 600kHzgain bandwidth product. In addition, these amplifiersfeature Rail-to-Rail outputs, high AVOL, plus excellentpower-supply rejection and common-mode rejectionratios for operation in noisy environments.The MAX4467/MAX4468 include a complete shutdownmode. In shutdown, the amplifiers’ supply current isreduced to 5nA and the bias current to the externalmicrophone is cut off for ultimate power savings. Thesingle MAX4465/MAX4466 are offered in the ultra-small5-pin SC70 package, while the single with shutdownMAX4467/MAX4468 and dual MAX4469 are available inthe space-saving 8-pin SOT23 package.
MAX4465–MAX4469Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownABSOLUTE MAXIMUM RATINGSSupply Voltage (VCC to GND). 6VAll Other Pins to GND.-0.3V to (VCC 0.3V)Output Short-Circuit DurationOUT Shorted to GND or VCC .ContinuousContinuous Power Dissipation (TA 70 C)5-Pin SC70 (derate 2.5mW/ C above 70 C) .200mW5-Pin SOT23 (derate 7.1mW/ C above 70 C) .571mW8-Pin SOT23 (derate 5.3mW/ C above 70 C) .421mW8-Pin SO (derate 5.88mW/ C above 70 C) .471mWOperating Temperature Range .-40 C to 85 CStorage Temperature Range .-65 C to 150 CJunction Temperature . 150 CLead Temperature (soldering, 10s) . 300 CStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.ELECTRICAL CHARACTERISTICS(VCC 5V, VCM 0, VOUT VCC/2, RL to VCC/2, SHDN GND (MAX4467/MAX4468 only). TA TMIN to TMAX, unless otherwisenoted. Typical values specified at TA 25 C.) (Note 1)PARAMETERSupply Voltage RangeSupply Current(Per Amplifier)Supply Current in ShutdownInput Offset VoltageInput Bias CurrentSYMBOLVCCICCI SHDNCONDITIONSInferred from PSRR testMINTYP2.4TA 25 C24SHDN VCC (Note 2)550nA 5mV 2.5 100nA 15nAInput Offset Current RangeIOSVCM -0.1VInput Common-Mode RangeVCMInferred from CMRR test-0.1Common-Mode Rejection RatioCMRR-0.1V VCM VCC - 1V801262.4V VCC 5.5V80112Power-Supply Rejection RatioPSRRVOHOutput Voltage Swing LowVOL 175MAX4466/MAX4468, f 3.4kHz80RL 100kΩ to VCC/2,0.05V VOUT VCC - 0.05V1258010RL 10kΩ16RL 100kΩ10RL 10kΩ14Output Leakage Currentin ShutdownSHDN VCC, 0 VOUT VCC ;(Notes 2, 3)VIL(Note 2)SHDN Logic HighVIH(Note 2)Gain Bandwidth Product2(Note 2)GBWPdB95RL 100kΩTo either supply railSHDN Logic Low505015mVmVmA 0.5 100VCC 0.3VCC 00Downloaded from Arrow.com.VdBdBRL 10kΩ to VCC/2,0.1V VOUT VCC - 0.1VOutput Short-Circuit CurrentSHDN Input CurrentVCC - 0.1MAX4465/MAX4467/MAX4469, f 3.4kHzIVCC - VOHIµA 1VCM -0.1VOutput Voltage Swing HighV60VOSAVOLUNITS5.548TA TMIN to TMAXIBOpen-Loop GainMAX25nAkHz
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete Shutdown(VCC 5V, VCM 0, VOUT VCC/2, RL to VCC/2, SHDN GND (MAX4467/MAX4468 only), TA TMIN to TMAX, unless otherwisenoted. Typical values specified at TA 25 C.) (Note 1)PARAMETERSYMBOLCONDITIONSChannel-to-Channel IsolationPhase MarginØMGain MarginSlew RateSRInput Noise Voltage DensityTotal Harmonic DistortionUNITSdBRL 100kΩ70degreesRL 100kΩ20dBMAX4465/MAX4467/MAX4469,AV 145MAX4466/MAX4468,AV 5300mV/µs80f 1kHz, RL 10kΩ,VOUT 2Vp-pCLOADMAX85f 1kHzTHDCapacitive Load StabilityTYPMAX4469 only, f 1kHzOutput step .03MAX4465/MAX4467/MAX4469, AV 1100MAX4466/MAX4468, AV 5100nV/ Hz%pFSHDN Delay Timet SHDN(Note 2)1µsEnable Delay TimetEN(Note 2)50µsPower-On TimetON(Note 2)40µsBias Switch On-ResistanceRSIS 5mA (Note 2)20Ω500Note 1: All specifications are 100% production tested at TA 25 C. All temperature limits are guaranteed by design.Note 2: Shutdown mode is available only on the MAX4467/MAX4468.Note 3: External feedback networks not considered.Typical Operating Characteristics(VCC 5V, VCM 0, VOUT VCC/2, RL 100kΩ to VCC/2, SHDN GND (MAX4467/MAX4468 only), TA 25 C, unless otherwisenoted.)0.11101001k10k 100kFREQUENCY (Hz)1MMAX4465/MAX4467/MAX4469GAIN AND PHASE vs. FREQUENCY (CL 100pF)1101001k10kFREQUENCY 40MAX4465-69 toc03MAX4465-69 0GAIN (dB)/PHASE (DEGREES)MAX4466/MAX4468 GAIN AND PHASEvs. FREQUENCY (NO LOAD)GAIN (dB)/PHASE 0MAX4465-69 toc01GAIN (dB)/PHASE (DEGREES)MAX4465/MAX4467/MAX4469GAIN AND PHASE vs. FREQUENCY (NO LOAD)0.11101001k10k 100kDownloaded from Arrow.com.1MFREQUENCY (Hz)3MAX4465–MAX4469ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)(VCC 5V, VCM 0, VOUT VCC/2, RL 100kΩ to VCC/2, SHDN GND (MAX4467/MAX4468 only), TA 25 C, unless otherwisenoted.)SHUTDOWN SUPPLY CURRENTvs. TEMPERATURE-50-70-90VSHDN 356085-40103560TEMPERATURE ( C)TEMPERATURE ( C)OUTPUT LEAKAGE CURRENTvs. TEMPERATURECHANNEL-TO-CHANNEL ISOLATIONvs. FREQUENCYINPUT OFFSET VOLTAGEvs. .1-6000.1851100101000-40-15103560TEMPERATURE ( C)FREQUENCY (kHz)TEMPERATURE ( C)OUTPUT VOLTAGE SWING HIGHvs. TEMPERATUREOUTPUT VOLTAGE SWING LOWvs. TEMPERATURECOMMON-MODE REJECTION RATIOvs. TEMPERATURE485MAX4465-69 toc124-100MAX4465-69 toc115MAX4465-69 toc10585MAX4465-69 toc09-20VOS (µV)10600MAX4465-69 toc081000CHANNEL-TO-CHANNEL ISOLATION (dB)VSHDN VCCVOUT VCC/2-40-15FREQUENCY (Hz)MAX4465-69 toc071000ILEAK (pA)22110MAX4465-69 toc06SUPPLY CURRENT (pA)-30SUPPLY CURRENT vs. TEMPERATURE27SUPPLY CURRENT (µA)-1010,000MAX4465-69 toc05MAX4465-69 toc04POWER-SUPPLY REJECTION RATIOvs. FREQUENCYPSRR (dB)MAX4465–MAX4469Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete Shutdown-102-10432CMRR (dB)VOUT - VSS (mV)VDD - VOUT MPERATURE ( C)46085-120-40-151035TEMPERATURE ( C)6085-40-1510Downloaded from Arrow.com.35TEMPERATURE ( C)6085
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete Shutdown(VCC 5V, VCM 0, VOUT VCC/2, RL 100kΩ to VCC/2, SHDN GND (MAX4467/MAX4468 only), TA 25 C, unless otherwisenoted.)1201251151.6MAX4465-69 toc15125MAX4465-69 toc14130MAX4465-69 toc131301.5GAIN (dB)105100VMIN (V)1.4110GAIN (dB)MINIMUM OPERATING VOLTAGEvs. TEMPERATURELARGE-SIGNAL GAINvs. TEMPERATURELARGE-SIGNAL GAINvs. OUTPUT 10356085VOUT (V)TEMPERATURE ( C)TEMPERATURE ( C)MAX4465/MAX4467/MAX4469TOTAL HARMONIC DISTORTION PLUS NOISEvs. FREQUENCYMAX4466/MAX4468TOTAL HARMONIC DISTORTIONvs. FREQUENCYMAX4465/MAX4467/MAX4469TOTAL HARMONIC DISTORTION PLUS NOISEvs. INPUT AMPLITUDERL 10kΩ0.1RL 10kΩ10.1MAX4465-69 toc18MAX4465-69 toc17100f 1kHzAV 1V/VBW 122kHz10THD N (%)1VOUT 2Vp-pAV 10V/VBW 22kHz10THD N (%)VOUT 2Vp-pAV 1V/VBW 22kHz10100MAX4465-69 toc16100THD N (%)1.01100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01RL 10kΩ0.1RL CY (Hz)MAX4466/MAX4468TOTAL HARMONIC DISTORTION PLUS NOISEvs. INPUT AMPLITUDENONINVERTING SMALL-SIGNALTRANSIENT RESPONSE0.51.01.52.02.53.0VIN (Vp-p)NONINVERTING LARGE-SIGNALTRANSIENT RESPONSEMAX4465-69 toc20MAX4465-69 toc21MAX4465-69 toc19f 1kHzAV 10V/VBW 22kHz10RL 100kΩ0.001FREQUENCY (Hz)100THD N (%)2000.01RL 100kΩ12V/div50mV/divRL 10kΩ0.10.01RL �s/divVIN (Vp-p)Downloaded from Arrow.com.5MAX4465–MAX4469Typical Operating Characteristics (continued)
Typical Operating Characteristics (continued)(VCC 5V, VCM 0, VOUT VCC/2, RL 100kΩ to VCC/2, SHDN GND (MAX4467/MAX4468 only), TA 25 C, unless otherwisenoted.)SUPPLY CURRENTvs. SUPPLY VOLTAGEMAX4465-69 toc22AVCL 1V/V220190eNOISE (nV Hz)30MAX4465-69 toc23eNOISE vs. FREQUENCY40SUPPLY CURRENT (µA)201601301001070400012341005SINK CURRENT vs. OUTPUT VOLTAGE1MSOURCE CURRENT vs. OUTPUT VOLTAGE25MAX4465-69 toc2420SOURCE CURRENT (mA)20SINK CURRENT (mA)100kFREQUENCY (Hz)25VCC 5V1510VCC 2.4V510k1kSUPPLY VOLTAGE (V)MAX4465-69 toc25MAX4465–MAX4469Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete Shutdown15VCC 5V10VCC 2.4V50000.51.01.52.02.53.000.5OUTPUT VOLTAGE (V)1.01.52.02.53.0OUTPUT VOLTAGE (V)Pin 4468MAX446946 (8)—OUT——1OUTA—1 (4)—MIC BIAS32 (3)—IN-Inverting Amplifier Input13 (2)—IN Noninverting Amplifier Input24 (1)4GNDGroundAmplifier OutputAmplifier Output AExternal Microphone Bias Network SwitchOutput( ) denotes S0T23 package of the MAX4467/MAX44686Downloaded from Arrow.com.
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownPINNAMEFUNCTION8VCCPositive Supply. Bypass with a 0.1µF capacitor toGND.—2INA-Inverting Amplifier Input A——3INA Noninverting Amplifier Input A——6INB-Inverting Amplifier Input B——5INB Noninverting Amplifier Input B——7OUTBAmplifier Output B—8 (6)—SHDNActive-High Shutdown Input. Connect to GNDfor normal operation. Connect to VCC forshutdown. Do not leave floating.—5 (5)—N.C.MAX4465MAX4466MAX4467MAX4468MAX446957 (7)—No Connection. Not internally connected.( ) denotes SOT23 package of the MAX4467/MAX4468.Detailed DescriptionThe MAX4465–MAX4469 are low-power, micropower opamps designed to be used as microphone preamplifiers. These preamplifiers are an excellent choice fornoisy environments because of their high commonmode rejection and excellent power-supply rejectionratios. They operate from a single 2.4V to 5.5V supply.The MAX4465/MAX4467/MAX4469 are unity-gain stableand deliver a 200kHz gain bandwidth from only 24µA ofsupply current. The MAX4466/MAX4468 have a minimum stable gain of 5V/V while providing a 600kHzgain bandwidth product.The MAX4467/MAX4468 feature a complete shutdown,which is active-high, and a shutdown-controlled outputproviding bias to the microphone. The MAX4465/MAX4467/MAX4469 feature a slew rate suited to voicechannel applications. The MAX4466/MAX4468 can beused for full-range audio, e.g., PC99 inputs.Rail-to-Rail Output StageThe MAX4465–MAX4469 can drive a 10kΩ load and stilltypically swing within 16mV of the supply rails. Figure 1shows the output voltage swing of the MAX4465 configured with AV 10.Switched Bias SupplyWhen used as a microphone amplifier for an electretmicrophone, some form of DC bias for the microphoneis necessary. The MAX4467/MAX4468 have the ability toturn off the bias to the microphone when the device is inshutdown. This can save several hundred microamps ofsupply current, which can be significant in low powerapplications. The MIC BIAS pin provides a switchedversion of VCC to the bias components. Figure 3 showssome typical values.Driving Capacitive LoadsDriving a capacitive load can cause instability in manyop amps, especially those with low quiescent current.The MAX4465/MAX4467/MAX4469 are unity-gain stablefor a range of capacitive loads up to 100pF. Figure 4shows the response of the MAX4465 with an excessivecapacitive load.Applications InformationShutdown ModeThe MAX4467 and MAX4468 feature a low-power, complete shutdown mode. When SHDN goes high, the supply current drops to 5nA, the output enters a highimpedance state and the bias current to the microphoneis switched off. Pull SHDN low to enable the amplifier.Do not leave SHDN floating. Figure 5 shows the shutdown waveform.Common-Mode Rejection RatioA microphone preamplifier ideally only amplifies the signal present on its input and converts it to a voltageappearing at the output. When used in noninvertingmode, there is a small output voltage fluctuation whenboth inputs experience the same voltage change in theDownloaded from Arrow.com.7MAX4465–MAX4469Pin Description (continued)
MAX4465–MAX4469Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownPower Supplies and Layoutcommon mode. The ratio of these voltages is called thecommon-mode gain. The common-mode rejection ratiois the ratio of differential-mode gain to common-modegain. The high CMRR properties of theMAX4465–MAX4469 provide outstanding performanceswhen configured as a noninverting microphone preamplifier.The MAX4465–MAX4469 operate from a single 2.4V to 5.5V power supply. Bypass the power supply with a0.1µF capacitor to ground. Good layout techniques arenecessary for the MAX4465–MAX4469 family. Todecrease stray capacitance, minimize trace lengths byplacing external components close to the op amp’spins. Surface-mount components are recommended. Insystems where analog and digital grounds are available, the MAX4465–MAX4469 should be connected tothe analog ground.Power-UpThe MAX4465–MAX4469 outputs typically settle within1µs after power-up. Figure 6 shows the output voltageon power-up.Test Circuits/Timing Diagrams1V/div100µs/divFigure 1. Rail-to-Rail Output Operation 5V 5V2kΩVCC 5V50.1µF2kΩMAX44661MΩIN 10.01µF41MΩOUTIN- 3ELECTRETCAPSULE10kΩ2GND1µF100kΩ100pFFigure 2. MAX4466 Typical Application Circuit8Downloaded from Arrow.com.
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownVCCSHDNMIC BIAS1kΩ100kΩIN NPUTGND0.1µF3.5mm SOCKET200kΩ20kΩ47pFFigure 3. Bias Network CircuitRL 10kΩCL 10pFCL 2000pFSHDN2V/div50mV/divOUT40µs/divFigure 4. Small-Signal Transient Response with ExcessiveCapacitive Load400µs/divFigure 5. MAX4467/MAX4468 Shutdown WaveformDownloaded from Arrow.com.9MAX4465–MAX4469Test Circuits/Timing Diagrams (continued)
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownMAX4465–MAX4469Test Circuits/TimingDiagrams (continued)Chip InformationMAX4465/MAX4466 TRANSISTOR COUNT: 62MAX4467/MAX4468 TRANSISTOR COUNT: 72MAX4469 TRANSISTOR COUNT: 113PROCESS: BiCMOSVCC2V/divOrdering Information (continued)PARTOUT1V/div20µs/divTEMP. RANGEPIN-PACKAGEMAX4467EKA-T-40 C to 85 C8 SOT23-8MAX4467ESA-40 C to 85 C8 SOMAX4468EKA-T-40 C to 85 C8 SOT23-8MAX4468ESA-40 C to 85 C8 SOMAX4469EKA-T-40 C to 85 C8 SOT23-8MAX4469ESA-40 C to 85 C8 SOFigure 6. Power-Up/Power-Down WaveformSelector GuidePARTMINIMUM GEMAX4465 1No2005 SC70/5 SOT23MAX4466 5No6005 SC70/5 SOT23MAX4467 1Yes2008 SOT23/8 SOMAX4468 5Yes6008 SOT23/8 SOMAX4469 1No2008 SOT23/8 SOPin Configurations (continued)GND1IN 2IN-3MIC BIAS4MAX4467MAX4468SOT23108OUTMIC BIAS 17VCCIN- 26SHDN5N.C.IN 3MAX4467MAX4468GND 4SOOUTA 18SHDN8VCC7VCCINA- 27OUTB6OUT5N.C.INA 36INB-GND 45INB MAX4469SOT23/SODownloaded from Arrow.com.
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownSC70, 5L.EPSDownloaded from Arrow.com.11MAX4465–MAX4469Package Information
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownSOT5L.EPSMAX4465–MAX4469Package Information (continued)12Downloaded from Arrow.com.
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownSOT23, 8L.EPSDownloaded from Arrow.com.13MAX4465–MAX4469Package Information (continued)
Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with Complete ShutdownSOICN.EPSMAX4465–MAX4469Package Information (continued)Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.14 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2001 Maxim Integrated ProductsDownloaded from Arrow.com.Printed USAis a registered trademark of Maxim Integrated Products.
-70-50-30 max4465-69 toc04 10,000 1000 100 10 1-40 10-15 35 60 85 shutdown supply current vs. temperature max4465-69 toc05 temperature ( c) supply current (pa) vshdn vcc 22 23 25 24 26 27-40 10-15 35 60 85 supply current vs. temperature max4465-69 toc06 temperature ( c) supply current (a) 1000 100 10 1 0.1-40 10-15 356085 output leakage .
