MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps General Description The MAX4475-MAX4478/MAX4488/MAX4489 wideband, low-noise, low-distortion operational amplifiers offer rail-to-rail outputs and single-supply operation down to 2.7V. They draw 2.2mA of quiescent supply current per amplifier while featuring ultra-low distortion (0.0002% THD+N), as well as low input voltage-noise density (4.5nV/Hz) and low input current-noise density (0.5fA/Hz). These features make the devices an ideal choice for applications that require low distortion and/or low noise. For power conservation, the MAX4475/MAX4488 offer a low-power shutdown mode that reduces supply current to 0.01A and places the amplifiers' outputs into a highimpedance state. These amplifiers have outputs which swing rail-to-rail and their input common-mode voltage range includes ground. The MAX4475-MAX4478 are unity-gain stable with a gain-bandwidth product of 10MHz. The MAX4488/4489 are internally compensated for gains of +5V/V or greater with a gain-bandwidth product of 42MHz. The single MAX4475/MAX4476/ MAX4488 are available in space-saving, 6-pin SOT23 and TDFN packages. Applications ADC Buffers DAC Output Amplifiers Low-Noise Microphone/Preamplifiers Digital Scales Strain Gauges/Sensor Amplifiers Medical Instrumentation MAX is a registered trademark of Maxim Integrated Products, Inc. Typical Operating Characteristic 25 MAX4475 toc20 VIN EQUIVALENT INPUT NOISE VOLTAGE (nV/Hz) INPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY 20 15 Features o o o o o o o o o o o Low Input Voltage-Noise Density: 4.5nV/Hz Low Input Current-Noise Density: 0.5fA/Hz Low Distortion: 0.0002% THD+N (1k load) Single-Supply Operation from +2.7V to +5.5V Input Common-Mode Voltage Range Includes Ground Rail-to-Rail Output Swings with a 1k Load 10MHz GBW Product, Unity-Gain Stable (MAX4475-MAX4478) 42MHz GBW Product, Stable with AV +5V/V (MAX4488/MAX4489) Excellent DC Characteristics VOS = 70V IBIAS = 1pA Large-Signal Voltage Gain = 120dB Low-Power Shutdown Mode: Reduces Supply Current to 0.01A Places Output in High-Impedance State Available in Space-Saving SOT23, TDFN, MAX(R), and TSSOP Packages Ordering Information PART 5 0 10 100 1k FREQUENCY (Hz) 10k 100k PINPACKAGE TOP MARK MAX4475AUT+T -40C to +125C 6 SOT23 MAX4475AUA+ -40C to +125C 8 MAX -- MAX4475ASA+ -40C to +125C 8 SO -- MAX4475ATT+T -40C to +125C 6 TDFN-EP* MAX4475AUT/V+T -40C to +125C 6 SOT23 +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad (connect to VSS). /V denotes an automotive qualified part. T = Tape and reel. AAZV +ADD +ACQQ Ordering Information continued at end of data sheet. Pin Configurations and Typical Operating Circuit appear at end of data sheet. Selector Guide PART 10 TEMP RANGE GAIN BW (MHz) STABLE GAIN (V/V) NO. OF AMPS SHDN MAX4475 10 1 1 Yes MAX4476 10 1 1 -- MAX4477 10 1 2 -- MAX4478 10 1 4 -- MAX4488 42 5 1 Yes MAX4489 42 5 2 -- For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maximintegrated.com. 19-2137; Rev 6; 6/12 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VDD to VSS) ......................-0.3V to +6.0V Analog Input Voltage (IN_+, IN_-)....(VSS - 0.3V) to (VDD + 0.3V) SHDN Input Voltage....................................(VSS - 0.3V) to +6.0V Output Short-Circuit Duration to Either Supply ..........Continuous Continuous Input Current (IN+, IN-) .................................10mA Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 9.1mW/C above +70C)...........727mW 6-Pin TDFN (derate 18.2mW/C above 70C) ...........1454mW 8-Pin MAX (derate 4.5mW/C above +70C) ............362mW 8-Pin SO (derate 5.88mW/C above +70C)...............471mW 14-Pin SO (derate 8.33mW/C above +70C)..............667mW 14-Pin TSSOP (derate 9.1mW/C above +70C) .........727mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER Supply Voltage Range Quiescent Supply Current Per Amplifier Input Offset Voltage Input Offset Voltage Tempco Input Bias Current SYMBOL VDD ID VOS CONDITIONS (Note 3) MIN TYP 2.7 MAX UNITS 5.5 V VDD = 3V 2.2 VDD = 5V 2.5 4.4 Shutdown mode (SHDN = VSS) (Note 2) 0.01 1.0 TA = +25C 70 Normal mode TA = -40C to +125C 350 750 TCVOS V/C pA IB (Note 4) 1 150 (Note 4) 1 150 Differential Input Resistance RIN Input Common-Mode Voltage Range VCM Common-Mode Rejection Ratio Power-Supply Rejection Ratio Large-Signal Voltage Gain 2 CMRR PSRR AVOL 1000 -0.2 VDD - 1.6 TA = -40C to +125C -0.1 VDD - 1.7 90 pA G TA = +25C TA = +25C V 6 IOS (VSS - 0.2V) VCM (VDD 1.6V) (VSS - 0.1V) VCM (VDD 1.7V) A 0.3 Input Offset Current Guaranteed by CMRR Test mA V 115 dB TA = -40C to +125C 90 VDD = 2.7 to 5.5V 90 120 RL = 10k to VDD/2; VOUT = 100mV to (VDD - 125mV) 90 120 RL = 1k to VDD/2; VOUT = 200mV to (VDD - 250mV) 85 110 RL = 500 to VDD/2; VOUT = 350mV to (VDD - 500mV) 85 110 dB dB Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps DC ELECTRICAL CHARACTERISTICS (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER Output Voltage Swing Output Short-Circuit Current Output Leakage Current SYMBOL VOUT TYP MAX |VIN+ - VIN-| 10mV, RL = 10k to VDD/2 VDD - VOH MIN 10 45 VOL - VSS 10 40 |VIN+ - VIN-| 10mV, RL = 1k to VDD/2 VDD - VOH 80 200 VOL - VSS 50 150 |VIN+ - VIN-| 10mV, RL = 500 to VDD/2 VDD - VOH 100 300 VOL - VSS 80 250 ISC ILEAK SHDN Logic Low VIL SHDN Logic High VIH SHDN Input Current Input Capacitance CONDITIONS 48 Shutdown mode (SHDN = VSS), VOUT = VSS to VDD 0.001 1.0 A 0.3 x VDD V 1 A V 0.01 CIN mV mA 0.7 x VDD SHDN = VSS to VDD UNITS 10 pF AC ELECTRICAL CHARACTERISTICS (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = +25C.) PARAMETER Gain-Bandwidth Product Slew Rate SYMBOL GBWP SR Full-Power Bandwidth (Note 5) Peak-to-Peak Input Noise Voltage Input Voltage-Noise Density Input Current-Noise Density Total Harmonic Distortion Plus Noise (Note 6) en(P-P) en in THD + N CONDITIONS TYP MAX4475-MAX4478 AV = +1V/V 10 MAX4488/MAX4489 AV = +5V/V 42 MAX4475-MAX4478 AV = +1V/V 3 MAX4488/MAX4489 AV = +5V/V 10 MAX4475-MAX4478 AV = +1V/V 0.4 MAX4488/MAX4489 AV = +5V/V 1.25 f = 0.1Hz to 10Hz 260 f = 10Hz 21 f = 1kHz 4.5 f = 30kHz 3.5 f = 1kHz 0.5 VOUT = 2VP-P, AV = +1V/V (MAX4475-MAX4478), RL = 10k to GND VOUT = 2VP-P, AV = +1V/V (MAX4475-MAX4478), RL = 1k to GND VOUT = 2VP-P, AV = +5V/V (MAX4488/MAX4489), RL = 10k to GND Maxim Integrated MIN f = 1kHz 0.0002 f = 20kHz 0.0007 f = 1kHz 0.0002 f = 20kHz 0.001 f = 1kHz 0.0004 f = 20kHz 0.0006 MAX UNITS MHz V/s MHz nVP-P nV/Hz fA/Hz % 3 AC ELECTRICAL CHARACTERISTICS (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = +25C.) PARAMETER Total Harmonic Distortion Plus Noise (Note 6) SYMBOL THD + N Capacitive-Load Stability Gain Margin CONDITIONS VOUT = 2VP-P, AV = +5V/V (MAX4488/MAX4489), RL = 1k to GND MIN TYP M Settling Time Delay Time to Shutdown tSH Enable Delay Time from Shutdown tEN Power-Up Delay Time MAX f = 1kHz 0.0005 f = 20kHz 0.008 UNITS % No sustained oscillations 200 pF 12 dB MAX4475-MAX4478, AV = +1V/V 70 MAX4488/MAX4489, AV = +5V/V 80 To 0.01%, VOUT = 2V step 2 s 1.5 s VOUT = 2.5V, VOUT settles to 0.1% 10 s VDD = 0 to 5V step, VOUT stable to 0.1% 13 s GM Phase Margin degrees All devices are 100% tested at TA = +25C. Limits over temperature are guaranteed by design. SHDN is available on the MAX4475/MAX4488 only. Guaranteed by the PSRR test. Guaranteed by design. Full-power bandwidth for unity-gain stable devices (MAX4475-MAX4478) is measured in a closed-loop gain of +2V/V to accommodate the input voltage range, VOUT = 4VP-P. Note 6: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/Hz. Note 1: Note 2: Note 3: Note 4: Note 5: Typical Operating Characteristics (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.) 12 10 8 6 4 2 150 100 50 0 -50 -100 -150 50 40 30 20 VDD = 3V 10 VDD = 5V -200 0 0 -250 -50 -40 -30 -20 -10 0 10 20 30 40 50 VOS (V) 4 VCOM = 0V 200 INPUT OFFSET VOLTAGE (V) 14 250 MAX4475 toc02 16 INPUT OFFSET VOLTAGE (V) MAX4475-8 toc1 18 INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE OFFSET VOLTAGE vs. TEMPERATURE MAX4475 toc03 INPUT OFFSET VOLTAGE DISTRIBUTION PERCENTAGE OF UNITS (%) MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 -0.5 0.5 1.5 2.5 3.5 4.5 INPUT COMMON-MODE VOLTAGE (V) Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.) OUTPUT VOLTAGE vs. OUTPUT LOAD CURRENT 0.20 70 60 60 50 VDD - VOH 0.10 VOL VOL (mV) VDD - VOH (mV) 50 0.15 40 30 RL = 1k 20 30 RL = 1k 0 10 RL = 10k 2 3 4 5 6 7 8 9 10 -50 0 25 50 75 100 125 75 100 LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING MAX4475 toc07 130 120 120 RL = 20k RL = 200k 90 RL = 2k 70 70 VDD = 3V RL REFERENCED TO GND VDD = 3V RL REFERENCED TO VDD 60 50 50 50 100 150 200 250 0 50 100 150 200 VOUT SWING FROM EITHER SUPPLY (mV) VOUT SWING FROM EITHER SUPPLY (mV) LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING LARGE-SIGNAL VOLTAGE GAIN vs. TEMPERATURE 140 MAX4475 toc10 RL = 200k 130 120 110 RL = 20k RL = 2k 90 80 RL = 10k 100 90 70 VDD = 5V RL REFERENCED TO VDD 60 50 60 100 150 200 VOUT SWING FROM EITHER SUPPLY (mV) Maxim Integrated 250 150 200 250 3.0 PER AMPLIFIER 2.5 2.0 1.5 1.0 0.5 VOUT = 150mV TO 4.75V 0 50 50 100 SUPPLY CURRENT vs. TEMPERATURE 80 70 50 VOUT SWING FROM EITHER SUPPLY (mV) 110 AVOL (dB) 100 RL = 100k 0 250 SUPPLY CURRENT (mA) 130 VDD = 5V RL REFERENCED TO GND 60 MAX4475 toc11 50 90 80 80 70 RL = 200k RL = 20k 100 AV (dB) AV (dB) 80 60 RL = 2k 110 100 90 125 130 110 RL = 20k RL = 200k 100 0 50 TEMPERATURE (C) RL = 2k 120 25 TEMPERATURE (C) 120 0 0 OUTPUT LOAD CURRENT (mA) 130 110 -25 -25 MAX4475 toc12 1 -50 MAX4475 toc08 0 RL = 10k 0 0 MAX4475 toc09 10 AV (dB) 40 20 0.05 AV (dB) MAX4475 toc06 VDD = 3V OR 5V VDIFF = 10mV MAX4475 toc05 70 MAX4475 toc04 0.25 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE SWING (VOL) vs. TEMPERATURE OUTPUT VOLTAGE SWING (VOH) vs. TEMPERATURE -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) 5 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.5 1.0 2.0 VDD = 3V 1.5 1.0 0.5 0.5 0 3.0 3.5 4.0 4.5 5.0 5.5 1 2 3 4 GAIN (dB) 108 72 30 72 20 36 10 0 0 -36 0 -36 -10 -72 -10 -108 -20 -30 -144 -30 -40 -180 100M -40 10M GAIN 5.0 5.5 100 1k 10k 180 144 -72 VDD = 3V OR 5V RL = 50k CL = 20pF AV = +1000V/V INPUT FREQUENCY (Hz) -108 PHASE -144 100k 1M 10M -180 100M INPUT FREQUENCY (Hz) MAX4475-MAX4478 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY MAX4475 toc19 MAX4475 toc18 1000 OUTPUT IMPEDANCE () PSRR (dB) MAX4475 toc15 40 0 PHASE MAX4475 toc17 108 10 1M 4.5 50 36 100k 4.0 144 20 -20 3.5 SUPPLY VOLTAGE (V) 60 GAIN (dB) GAIN 30 100 10 AV = +5 1 AV = +1 0.1 0.01 10 FREQUENCY (kHz) 6 3.0 180 PHASE (degrees) VDD = 3V OR 5V RL = 50k CL = 20pF AV = +1000V/V 40 0 VDD = 3V OR 5V -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 0.001 0.1 2.5 MAX4488/MAX4489 GAIN AND PHASE vs. FREQUENCY MAX4475 toc16 10k -10 OUTPUT VOLTAGE (V) 60 1k -5 5 MAX4475-MAX4478 GAIN AND PHASE vs. FREQUENCY 100 0 -20 0 SUPPLY VOLTAGE (V) 50 5 -15 0 2.5 10 PHASE (degrees) 2.0 15 INPUT OFFSET VOLTAGE (V) VDD = 5V 2.5 SUPPLY CURRENT (mA) 2.5 20 MAX4475 toc14 PER AMPLIFIER SUPPLY CURRENT (mA) 3.0 MAX4475 toc13 3.0 INPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. OUTPUT VOLTAGE 1000 100,000 1 10 100 1k 10k FREQUENCY (Hz) Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.) MAX4475 toc21 25 AV = +1 RL = 100k 1 THD + N (%) 20 10 VDD = 3V OR 5V VP-P NOISE = 260nVP-P 15 200nV/div 10 0.1 0.01 fO = 20kHz, FILTER BW = 80kHz 5 0.001 0 0.0001 fO = 3kHz, FILTER BW = 30kHz 100 1k 10k 1s/div 100k 0 FREQUENCY (Hz) 0.01 MAX4475 toc24 1 MAX4488/MAX4489 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 0.01 MAX4475 toc23 AV = +5 RL = 100k VDD = +3V, fO = 20kHz FILTER BW = 80kHz 0.001 0.001 AV = +10, VDD = 3V AV = +10, VDD = 5V FILTER BW = 22kHz RL = 10k TO GND R1 = 5.6k, R2 = 53k VOUT = 2VP-P VDD = 3V, fO = 3kHz FILTER BW = 30kHz 0.0001 1 4 2 0 3 5k 10k 15k MAX4475-MAX4478 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY FILTER BW = 80kHz VOUT = 2VP-P AV = +1 RL = 1k RL TO VDD/2 0 20k RL TO GND RL TO VDD 0.001 0.0001 0.00001 0 3 THD + N (%) THD + N (%) THD + N (%) 0.1 0.01 2 OUTPUT VOLTAGE (VP-P) MAX4488/MAX4489 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING 10 1 MAX4475 toc25 10 5k 10k 20k 15k OUTPUT VOLTAGE (VP-P) FREQUENCY (Hz) FREQUENCY (Hz) MAX4488/MAX4489 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX4475-MAX4478 LARGE-SIGNAL PULSE RESPONSE MAX4475-MAX4478 SMALL-SIGNAL PULSE RESPONSE FILTER BW = 80kHz RL = 10k TO GND R1 = 2.43k, R2 = 10k VOUT = 2.75VP-P 0.1 MAX4475 toc27 MAX4475 toc28 MAX4475 toc26 1 THD + N (%) MAX4475 toc22 MAX4475 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING 0.1Hz TO 10HzP-P NOISE MAX4475 toc20 VIN EQUIVALENT INPUT NOISE VOLTAGE (nV/Hz) INPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY 0.6V 2.5V 20mV/div 0.01 AV = +5, VDD = 3V 0.001 0.5V 0.5V AV = +5, VDD = 5V 0.0001 0 5k 10k FREQUENCY (Hz) Maxim Integrated 15k 20k 1s/div VDD = 3V, RL = 10k, CL = 100pF VIN = 2V 4s/div VDD = 3V, RL = 10k, CL = 100pF VIN = 100mV PULSE 7 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.) MAX4488/MAX4489 SMALL-SIGNAL PULSE RESPONSE MAX4488/MAX4489 LARGE-SIGNAL PULSE RESPONSE MAX4477/MAX4478/MAX4489 CROSSTALK vs. FREQUENCY MAX4475 toc30 MAX4475 toc29 MAX4475 toc31 -20 -30 VOUT 200mV/div 1.5V -40 CROSSTALK (dB) 1.6V VOUT 50mV/div -50 -60 -70 -80 -90 1s/div 1s/div 10 100 VDD = 3V, RL = 10k, CL = 50pF VIN = 20mV PULSE, AV = +5V/V VDD = 3V, RL = 10k, CL = 50pF VIN = 20mV PULSE, AV = +5V/V 1000 10k 100k 1M 10M 100M FREQUENCY (Hz) Pin Description PIN MAX4475/ MAX4488 MAX4475/ MAX4488 MAX4476 MAX4477/ MAX4489 MAX4478 SOT23/TDFN SO/MAX SOT23/TDFN SO/MAX SO/TSSOP 1 6 1 1, 7 1, 7, 8, 14 OUT, OUTA, OUTB, OUTC, OUTD 2 4 2 4 11 VSS 3 3 3 3, 5 3, 5, 10, 12 IN+, INA+, INB+, INC+, IND+ 4 2 4 2, 6 2, 6, 9, 13 IN-, INA-, INB-, INC-, IND- 6 7 6 8 4 VDD 8 NAME 5 8 -- -- -- SHDN -- 1, 5 5 -- -- N.C. EP -- EP -- -- EP FUNCTION Amplifier Output Negative Supply. Connect to ground for singlesupply operation Noninverting Amplifier Input Inverting Amplifier Input Positive Supply Shutdown Input. Connect to VDD for normal operation (amplifier(s) enabled). No Connection. Not internally connected. Exposed Paddle (TDFN Only). Connect to VSS. Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Detailed Description The MAX4475-MAX4478/MAX4488/MAX4489 singlesupply operational amplifiers feature ultra-low noise and distortion. Their low distortion and low noise make them ideal for use as preamplifiers in wide dynamicrange applications, such as 16-bit analog-to-digital converters (see Typical Operating Circuit). Their highinput impedance and low noise are also useful for signal conditioning of high-impedance sources, such as piezoelectric transducers. These devices have true rail-to-rail ouput operation, drive loads as low as 1k while maintining DC accuracy, and can drive capactive loads up to 200pF without oscillation. The input common-mode voltage range extends from (VDD - 1.6V) to 200mV below the negative rail. The push-pull output stage maintains excellent DC characteristics, while delivering up to 5mA of current. The MAX4475-MAX4478 are unity-gain stable, while the MAX4488/MAX4489 have a higher slew rate and are stable for gains 5V/V. The MAX4475/MAX4488 feature a low-power shutdown mode, which reduces the supply current to 0.01A and disables the outputs. CZ RF RG VOUT VIN Figure 1. Adding Feed-Forward Compensation AV = +2 RF = RG = 100k VIN 100mV/div 100mV 0V Low Distortion Many factors can affect the noise and distortion that the device contributes to the input signal. The following guidelines offer valuable information on the impact of design choices on Total Harmonic Distortion (THD). Choosing proper feedback and gain resistor values for a particular application can be a very important factor in reducing THD. In general, the smaller the closedloop gain, the smaller the THD generated, especially when driving heavy resistive loads. The THD of the part normally increases at approximately 20dB per decade, as a function of frequency. Operating the device near or above the full-power bandwidth significantly degrades distortion. VOUT 100mV/div 2s/div Figure 2a. Pulse Response with No Feed-Forward Compensation AV = +2 RF = RG = 100k Referencing the load to either supply also improves the part's distortion performance, because only one of the MOSFETs of the push-pull output stage drives the output. Referencing the load to midsupply increases the part's distortion for a given load and feedback setting. (See the Total Harmonic Distortion vs. Frequency graph in the Typical Operating Characteristics.) For gains 5V/V, the decompensated devices MAX4488/MAX4489 deliver the best distortion performance, since they have a higher slew rate and provide a higher amount of loop gain for a given closed-loop gain setting. Capacitive loads below 100pF do not significantly affect distortion results. Distortion performance is relatively constant over supply voltages. Maxim Integrated VIN 100mV/div VOUT 100mV/div 2s/div Figure 2b. Pulse Response with 10pF Feed-Forward Compensation 9 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Low Noise The amplifier's input-referred noise-voltage density is dominated by flicker noise at lower frequencies, and by thermal noise at higher frequencies. Because the thermal noise contribution is affected by the parallel combination of the feedback resistive network (R F || R G , Figure 1), these resistors should be reduced in cases where the system bandwidth is large and thermal noise is dominant. This noise contribution factor decreases, however, with increasing gain settings. For example, the input noise-voltage density of the circuit with R F = 100k, R G = 11k (A V = +5V/V) is e n = 14nV/Hz, e n can be reduced to 6nV/Hz by choosing RF = 10k, RG = 1.1k (AV = +5V/V), at the expense of greater current consumption and potentially higher distortion. For a gain of 100V/V with RF = 100k, RG = 1.1k, the en is still a low 6nV/Hz. AV = +1 VDD = +5V RL = 10k VIN 2V/div 0V VOUT 2V/div 40s/div Figure 3. Overdriven Input Showing No Phase Reversal Using a Feed-Forward Compensation Capacitor, CZ The amplifier's input capacitance is 10pF. If the resistance seen by the inverting input is large (feedback network), this can introduce a pole within the amplifier's bandwidth resulting in reduced phase margin. Compensate the reduced phase margin by introducing a feed-forward capacitor (CZ) between the inverting input and the output (Figure 1). This effectively cancels the pole from the inverting input of the amplifier. Choose the value of CZ as follows: 5V VOUT 1V/div 0V CZ = 10 x (RF / RG) [pF] In the unity-gain stable MAX4475-MAX4478, the use of a proper CZ is most important for AV = +2V/V, and A V = -1V/V. In the decompensated MAX4488/ MAX4489, C Z is most important for A V = +10V/V. Figures 2a and 2b show transient response both with and without CZ. Using a slightly smaller CZ than suggested by the formula above achieves a higher bandwidth at the expense of reduced phase and gain margin. As a general guideline, consider using CZ for cases where RG || R F is greater than 20k (MAX4475-MAX4478) or greater than 5k (MAX4488/MAX4489). Applications Information The MAX4475-MAX4478/MAX4488/MAX4489 combine good driving capability with ground-sensing input and rail-to-rail output operation. With their low distortion and low noise, they are ideal for use in ADC buffers, medical instrumentation systems and other noise-sensitive applications. 10 20s/div Figure 4. Rail-to-Rail Output Operation Ground-Sensing and Rail-to-Rail Outputs The common-mode input range of these devices extends below ground, and offers excellent commonmode rejection. These devices are guaranteed not to undergo phase reversal when the input is overdriven (Figure 3). Figure 4 showcases the true rail-to-rail output operation of the amplifier, configured with AV = 5V/V. The output swings to within 8mV of the supplies with a 10k load, making the devices ideal in low-supply voltage applications. Power Supplies and Layout The MAX4475-MAX4478/MAX4488/MAX4489 operate from a single +2.7V to +5.5V power supply or from dual supplies of 1.35V to 2.75V. For single-supply operation, bypass the power supply with a 0.1F ceramic Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Typical Application Circuit +5V +5V 7 VDD CS SERIAL INTERFACE +2.5V SCLK U2 MAX4475AUA REF U1 MAX5541ESA 3 OUT DIN 0 to +2.5V OUTPUT 6 AGND DGND 2 4 8 SHDN Typical Operating Circuit 5V 470pF 0.1F 3.09k 1% 7.87k 1% 220pF 3 8 220pF 1 3.83k 1% 13.7k 1% 5 1/2 MAX4477 7 220pF 2 4 7.15k 1% 1/2 MAX4477 220pF 6 10.0k 1% 10.0k 1% 10.0k 1% capacitor placed close to the VDD pin. If operating from dual supplies, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance and noise at the op amp's inputs and output. To decrease stray capacitance, minimize PC board trace lengths and resistor leads, and place external components close to the op amp's pins. Typical Application Circuit The Typical Application Circuit shows the single MAX4475 configured as an output buffer for the MAX5541 16-bit DAC. Because the MAX5541 has an unbuffered voltage output, the input bias current of the op amp used must be less than 6nA to maintain 16-bit accuracy. The MAX4475 has an input bias current of only 150pA (max), virtually eliminating this as a source Maxim Integrated 15.0k 1% of error. In addition, the MAX4475 has excellent openloop gain and common-mode rejection, making this an excellent ouput buffer amplifier. DC-Accurate Lowpass Filter The MAX4475-MAX4478/MAX4488/MAX4489 offer a unique combination of low noise, wide bandwidth, and high gain, making them an excellent choice for active filters up to 1MHz. The Typical Operating Circuit shows the dual MAX4477 configured as a 5th order Chebyschev filter with a cutoff frequency of 100kHz. The circuit is implemented in the Sallen-Key topology, making this a DC-accurate filter. 11 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps TOP VIEW TOP VIEW + + N.C. INA- 2 VSS 4 7 VDD 6 OUT 5 N.C. OUTA 1 INA- 2 INA+ 14 OUTD INA+ 3 12 IND+ VDD 4 MAX4478 6 INB- 5 INB+ OUT 1 VSS 2 MAX4475 MAX4488 6 VDD 5 SHDN 6 5 4 MAX4475 MAX4488 11 VSS 10 INC+ INB- 6 9 INC- OUTB 7 8 OUTC IN+ 3 4 INEP + SOT23-6 1 OUT INB+ 5 SO/TSSOP 3 1 VSS 2 MAX4476 6 VDD 5 N.C. N.C. IN- TOP VIEW + VDD TDFN TOP VIEW OUT 2 IN+ 13 IND- OUTB TOP VIEW + 2 7 IN- TOP VIEW INA- VDD SO/MAX + OUTA 1 3 VSS 4 SO/MAX TOP VIEW MAX4477 MAX4489 8 SHDN 3 SHDN VSS INA+ MAX4475 MAX4488 8 VDD MAX4475-MAX4478/MAX4488/MAX4489 Pin Configurations 6 5 4 MAX4476 IN+ 3 4 IN- 2 3 IN+ 1 OUT + VSS EP SOT23-6 TDFN 12 Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Ordering Information (continued) PART TEMP RANGE PINPACKAGE TOP MARK MAX4476AUT+T -40C to +125C 6 SOT23 AAZX MAX4476ATT+T -40C to +125C 6 TDFN-EP* +ADF MAX4477AUA+ -40C to +125C 8 MAX -- MAX4477AUA+ -40C to +125C 8 MAX -- MAX4477ASA+ -40C to +125C 8 SO -- MAX4478AUD+ -40C to +125C 14 TSSOP -- MAX4478AUD/V+ -40C to +125C 14 TSSOP -- MAX4478ASD+ -40C to +125C 14 SO -- MAX4488AUT+T -40C to +125C 6 SOT23 AAZW MAX4488AUA+ -40C to +125C 8 MAX -- MAX4488ASA+ -40C to +125C 8 SO -- MAX4488ATT+T -40C to +125C 6 TDFN-EP* MAX4489AUA+ -40C to +125C 8 MAX -- MAX4489AUA/V+T -40C to +125C 8 MAX -- MAX4489ASA+ -40C to +125C 8 SO +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad (connect to VSS). /V denotes an automotive qualified part. T = Tape and reel. Maxim Integrated Chip Information PROCESS: BiCMOS +ADE -- 13 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 14 PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 SOT23 U6F+6 21-0058 90-0175 8 MAX U8+1 21-0036 90-0092 14 TSSOP U14+2 21-0066 90-0117 8 SO S8+4 21-0041 14 SO S14+4 21-0041 -- -- 6 TDFN-EP T633+2 21-0137 90-0058 Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 15 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 16 Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 17 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 18 Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 19 MAX4475-MAX4478/MAX4488/MAX4489 MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. C OMMON DIMENSIONS 20 P AC KAGE V AR IA TIONS MIN. MAX. P K G .CODE N D2 E2 e J EDEC S PE C b A 0.70 0.80 T633-2 6 1.500.10 2.300.10 0.95 B SC MO229 / WE E A 0.400.05 1.90 R EF D 2.90 3.10 T833-2 8 1.500.10 2.300.10 0.65 B SC MO229 / WE E C 0.300.05 1.95 R EF S YMBOL [(N/2)-1] x e E 2.90 3.10 T833-3 8 1.500.10 2.300.10 0.65 B SC MO229 / WE E C 0.300.05 1.95 R EF A1 0.00 0.05 T1033-1 10 1.500.10 2.300.10 0.50 B SC MO229 / WE E D-3 0.250.05 2.00 R EF L 0.20 0.40 T1033MK -1 10 1.500.10 2.300.10 0.50 B SC MO229 / WE E D-3 0.250.05 2.00 R EF 1.500.10 2.300.10 0.50 B SC MO229 / WE E D-3 0.250.05 2.00 R EF 2.40 R EF k 0.25 MIN. T1033-2 10 A2 0.20 R EF . T1433-1 14 1.700.10 2.300.10 0.40 B SC ---- 0.200.05 T1433-2 14 1.700.10 2.300.10 0.40 B SC ---- 0.200.05 2.40 R EF T1433-3F 14 1.700.10 2.300.10 0.40 B SC ---- 0.200.05 2.40 R EF Maxim Integrated MAX4475-MAX4478/MAX4488/MAX4489 SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Amps Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 4 12/09 Added lead-free designations and an automotive part to the Ordering Information and added input current spec in Absolute Maximum Ratings section 1, 2, 13 5 7/10 Added /V designation to the MAX4475 product and soldering temperature 1, 2 6 6/12 Added /V designation for MAX4489. 13 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________________________ 21 (c) 2012 Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX4488AUT+T MAX4475ASA+ MAX4475AUA+ MAX4477ASA+ MAX4477AUA+ MAX4478AUD+ MAX4489AUA+ MAX4475AUT+T MAX4475ASA+T MAX4475ATT+T MAX4475AUA+T MAX4476ATT+T MAX4477ASA+T MAX4477AUA+T MAX4478ASD+ MAX4478ASD+T MAX4478AUD+T MAX4488ASA+ MAX4488ASA+T MAX4488ATT+T MAX4488AUA+ MAX4488AUA+T MAX4489ASA+ MAX4489ASA+T MAX4489AUA+T MAX4477ASA MAX4477ASA-T MAX4477AUA MAX4477AUA-T MAX4478ASD MAX4478ASD-T MAX4475AUT/V+T MAX4478AUD/V+ MAX4478AUD/V+T MAX4478AUD MAX4478AUD-T MAX4489ASA MAX4489ASA-T MAX4489AUA MAX4489AUA-T MAX4476AUT+T