EVALUATION KIT AVAILABLE MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps General Description The MAX4249–MAX4257 low-noise, low-distortion operational amplifiers offer rail-to-rail outputs and singlesupply operation down to 2.4V. They draw 400µA of quiescent supply current per amplifier while featuring ultra-low distortion (0.0002% THD), as well as low input voltage-noise density (7.9nV/!Hz) and low input current-noise density (0.5fA/!Hz). These features make the devices an ideal choice for portable/battery-powered applications that require low distortion and/or low noise. For additional power conservation, the MAX4249/ MAX4251/MAX4253/MAX4256 offer a low-power shutdown mode that reduces supply current to 0.5µA and puts the amplifiers’ outputs into a high-impedance state. The MAX4249-MAX4257’s outputs swing rail-torail and their input common-mode voltage range includes ground. The MAX4250–MAX4254 are unitygain stable with a gain-bandwidth product of 3MHz. The MAX4249/MAX4255/MAX4256/MAX4257 are internally compensated for gains of 10V/V or greater with a gain-bandwidth product of 22MHz. The single MAX4250/ MAX4255 are available in space-saving 5-pin SOT23 packages. The MAX4252 is available in an 8-bump chipscale package (UCSP™) and the MAX4253 is available in a 10-bump UCSP. The MAX4250AAUK comes in a 5-pin SOT23 package and is specified for operation over the automotive (-40°C to +125°C) temperature range. Applications Wireless Communications Devices PA Control Portable/Battery-Powered Equipment Medical Instrumentation ADC Buffers Digital Scales/Strain Gauges Features ! Available in Space-Saving UCSP, SOT23, and µMAX® Packages ! Low Distortion: 0.0002% THD (1k" load) ! 400µA Quiescent Supply Current per Amplifier ! Single-Supply Operation from 2.4V to 5.5V ! Input Common-Mode Voltage Range Includes Ground ! Outputs Swing Within 8mV of Rails with a 10k" Load ! 3MHz GBW Product, Unity-Gain Stable (MAX4250–MAX4254) 22MHz GBW Product, Stable with AV # 10V/V (MAX4249/MAX4255/MAX4256/MAX4257) ! Excellent DC Characteristics VOS = 70µV IBIAS = 1pA Large-Signal Voltage Gain = 116dB ! Low-Power Shutdown Mode Reduces Supply Current to 0.5µA Places Outputs in a High-Impedance State ! 400pF Capacitive-Load Handling Capability Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK MAX4249ESD+ -40°C to +85°C 14 SO MAX4249EUB+ -40°C to +85°C 10 µMAX — MAX4250EUK+T -40°C to +85°C 5 SOT23 ACCI MAX4250AAUK+T -40°C to +125°C 5 SOT23 +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. — AEYJ Ordering Information continued at end of data sheet. Selector Guide appears at end of data sheet. Pin/Bump Configurations TOP VIEW (BUMPS ON BOTTOM) 1 2 A OUTA VDD B INA- 3 A1 A2 A3 A4 OUTB OUTB INB- INB+ SHDNB INB- VDD C1 C2 C3 C4 INB+ OUTA INA- INA+ SHDNA B4 B1 C INA+ MAX4252 VSS UCSP MAX4253 VSS UCSP Pin/Bump Configurations continued at end of data sheet. UCSP is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. 19-1295; Rev 9; 12/12 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VDD to VSS) ......................+6.0V to -0.3V Analog Input Voltage (IN_+, IN_-)....(VDD + 0.3V) to (VSS - 0.3V) SHDN Input Voltage ......................................6.0V to (VSS - 0.3V) Output Short-Circuit Duration to Either Supply ..........Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW 8-Bump UCSP (derate 4.7mW/°C above +70°C)........379mW 8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW 10-Bump UCSP (derate 6.1mW/°C above +70°C) ......484mW 10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW 14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW Operating Temperature Range ...........................-40°C to +85°C MAX4250AAUK .............................................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C 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. ELECTRICAL CHARACTERISTICS (VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 2, 3) PARAMETER Supply Voltage Range SYMBOL VDD CONDITIONS (Note 4) MIN 2.4 VDD = 3V Quiescent Supply Current Per Amplifier IQ Normal mode VDD = 5V E temperature 420 MAX4250AAUK Input Offset Voltage Tempco TCVOS E temperature IB Differential Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio 2 IOS CMRR 575 655 0.5 1.5 ±0.07 ±0.75 0.3 (Note 6) 0.1 (Note 6) TA = -40°C to +125°C 1500 10 TA = -40°C to +125°C 100 1000 Guaranteed by CMRR test VSS - 0.2V ≤ VCM ≤ VDD - 1.1V pA GΩ -0.2 VDD -1.1 MAX4250AAUK 0 VDD -1.1 E temperature 70 MAX4250AAUK 68 115 pA 1 TA = -40°C to +85°C E temperature mV 1 50 0.1 µA µV/°C TA = -40°C to +85°C RIN VCM V ±1.85 TA = +25°C Input Offset Current 5.5 420 MAX4250AAUK TA = +25°C Input Bias Current UNITS 675 Shutdown mode (SHDN = VSS) (Note 2) VOS MAX 400 VDD = 5V, UCSP only Input Offset Voltage (Note 5) TYP V dB Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps ELECTRICAL CHARACTERISTICS (continued) (VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 2, 3) PARAMETER Power-Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing Output Voltage Swing Output Short-Circuit Current Output Leakage Current SYMBOL PSRR AV VOUT VOUT CONDITIONS VDD – 2.4V to 5.5V RL = 10kΩ to VDD/2; VOUT = 25mV to VDD – 4.97V RL = 1kΩ to VDD/2; VOUT = 150V to VDD – 4.75V |VIN+ - VIN-| ≥ 10mV; RL = 10kΩ to VDD/2 |VIN+ - VIN-| ≥ 10mV, RL = 1kΩ to VDD/2 TYP E temperature 75 100 MAX4250AAUK 72 E temperature 80 MAX4250AAUK 77 E temperature 80 MAX4250AAUK 77 VDD - VOH VOL - VSS VDD - VOH VOL - VSS E A E ILEAK SHDN Logic High VIH (Note 2) A Slew Rate Peak-to-Peak Input-Noise Voltage Input Voltage-Noise Density Input Current-Noise Density Maxim Integrated 77 A E 47 A SHDN = VSS = VDD (Note 2) SR enP-P en in mV 200 225 100 mV 125 0.001 mA 1.0 µA 0.2 X VDD V 0.8 X VDD V 0.5 11 GBW 25 30 20 25 E Input Capacitance Gain-Bandwidth Product dB 112 7 Shutdown mode (SHDN = VSS), VOUT = VSS to VDD (Note 2) (Note 2) UNITS dB 68 VIL IIL/IIH MAX 116 8 ISC SHDN Logic Low SHDN Input Current MIN MAX4250–MAX4254 3 MAX4249/MAX4255/MAX4256/MAX4257 22 MAX4250–MAX4254 0.3 MAX4249/MAX4255/MAX4256/MAX4257 2.1 f = 0.1Hz to 10Hz 760 f = 10Hz 27 f = 1kHz 8.9 f = 30kHz 7.9 f = 1kHz 0.5 1.5 µA pF MHz V/µs nVP-P nV/√Hz fA/√Hz 3 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps ELECTRICAL CHARACTERISTICS (continued) (VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 2, 3) PARAMETER Total Harmonic Distortion Plus Noise SYMBOL THD+N Capacitive-Load Stability Gain Margin Phase Margin GM ΦM CONDITIONS MAX4250–MAX4254 AV = 1V/V, VOUT = 2VP-P, RL = 1kΩ to GND (Note 7) MAX4249/MAX4255/ MAX4256/MAX4257 AV = 1V/V, VOUT = 2VP-P, RL = 1kΩ to GND (Note 7) 0.0004 f = 20kHz 0.006 f = 1kHz 0.0012 f = 20kHz 0.007 10 MAX4249/MAX4255/MAX4256/MAX4257, AV = 10V/V 74 MAX4249/MAX4255/MAX4256/MAX4257, AV = 10V/V 68 Delay Time to Enable tEN VOUT = 2.5V, VOUT settles to 0.1% UNITS MAX4250–MAX4254 6.7 MAX4249/MAX4255/ MAX4256/MAX4257 1.6 MAX4251/MAX4253 0.8 MAX4249/MAX4256 1.2 MAX4251/MAX4253 8 MAX4249/MAX4256 3.5 VDD = 0 to 5V step, VOUT stable to 0.1% pF dB 12.5 MAX4250–MAX4254, AV = 1V/V IVDD = 5% of normal operation MAX % MAX4250–MAX4254, AV = 1V/V tSH tPU f = 1kHz 400 Delay Time to Shutdown Power-Up Delay Time TYP No sustained oscillations To 0.01%, VOUT = 2V step Settling Time MIN Degrees µs µs µs 6 µs Note 2: SHDN is available on the MAX4249/MAX4251/MAX4253/MAX4256 only. Note 3: All device specifications are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design. Note 4: Guaranteed by the PSRR test. Note 5: Offset voltage prior to reflow on the UCSP. Note 6: Guaranteed by design. Note 7: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/!Hz. 4 Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Typical Operating Characteristics (VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/!Hz for all distortion measurements, TA = +25°C, unless otherwise noted.) 100 50 0 -50 15 -100 10 -150 0 -250 -40 -20 VOS (µV) OUTPUT VOLTAGE vs. OUTPUT LOAD CURRENT 0.4 0.3 VOL 60 0.2 0.06 RL = 1kΩ 4 5 6 7 8 9 10 0.05 RL = 20kΩ 110 0.01 RL = 10kΩ RL = 100kΩ -40 -20 0 20 40 60 0 80 140 130 120 AV (dB) 100 90 110 RL = 20kΩ RL = 200kΩ 100 RL = 2kΩ 80 70 VDD = 3V RL REFERENCED TO GND 100 150 200 VOUT SWING FROM EITHER SUPPLY (mV) Maxim Integrated -20 250 60 0 20 40 60 80 LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING 140 RL = 200kΩ 130 120 110 RL = 20kΩ 100 RL = 2kΩ 80 70 70 50 50 -40 90 90 80 0 RL = 10kΩ RL = 100kΩ TEMPERATURE (°C) LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING RL = 2kΩ 60 0.03 0.02 MAX4249-57 TOC08 120 4.5 RL = 1kΩ TEMPERATURE (°C) MAX4249-57 TOC07 130 3.5 0.04 LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING RL = 200kΩ 2.5 0.04 0.06 OUTPUT LOAD CURRENT (mA) 140 1.5 0.05 AV (dB) 3 0.5 OUTPUT VOLTAGE SWING (VOL) vs. TEMPERATURE 0.07 0 2 0 OUTPUT VOLTAGE SWING (VOH) vs. TEMPERATURE 0.01 1 VDD = 5V INPUT COMMON-MODE VOLTAGE (V) 0.02 0 VDD = 3V 50 -50 -0.5 80 0.03 0 100 TEMPERATURE (°C) 0.08 0.1 AV (dB) 40 0.09 VDD - VOH (V) OUTPUT VOLTAGE (V) VDD - VOH 20 VOL (V) VDD = 3V OR 5V VDIFF = ±10mV 0.5 0.10 MAX4249-57 TOC04 0.6 0 MAX4249-57 TOC05 -200 -95 -75 -55 -35 -13 7 28 49 69 90 110 131 152 172 192 5 150 MAX4249-57 TOC09 20 MAX4249-57 TOC03 150 200 INPUT OFFSET VOLTAGE (µV) 25 VCM = 0 200 VOS (µV) NUMBER OF UNITS 30 INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE MAX4249-57 TOC02 400 UNITS VCM = 0 TA = +25°C 35 250 MAX4249-57 TOC01 40 OFFSET VOLTAGE vs. TEMPERATURE MAX4249 -57TOC06 MAX4251/MAX4256 INPUT OFFSET VOLTAGE DISTRIBUTION VDD = 3V RL REFERENCED TO GND 0 50 100 150 200 250 VOUT SWING FROM EITHER SUPPLY (mV) VDD = 5V RL REFERENCED TO GND 60 50 0 50 100 150 200 250 VOUT SWING FROM EITHER SUPPLY (mV) 5 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/!Hz for all distortion measurements, TA = +25°C, unless otherwise noted.) RL = 100kΩ VOUT = 10mV TO 4.99mV 110 80 105 70 VDD = 5V RL REFERENCED TO GND 0 100 50 100 150 200 250 VOUT SWING FROM EITHER SUPPLY (mV) -40 -20 0.4 SHDN = VSS 380 0.3 360 0.2 340 0.1 320 2.3 2.8 3.3 3.8 4.3 60 80 -40 20 60 144 50 108 40 72 30 36 10 0 0 -36 -72 -10 PHASE -20 -108 GAIN (dB) GAIN 180 120 40 0.01 0.1 1 5 MAX4249-57 TOC17 VDD = 3V, 5V RL = 50kΩ CL = 20pF AV = 1000 GAIN 180 0 144 -10 108 -20 72 20 36 10 0 0 -36 PHASE -10 -80 -90 -30 -144 -100 -180 10M -110 FREQUENCY (Hz) 100k FREQUENCY (Hz) 3.8 4.3 4.8 5.3 1M VDD = 3V, 5V PSRR+ -70 -72 10k 3.3 MAX4250–MAX4254 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -60 -108 1k 2.8 -50 -20 100 2.3 -40 -40 1M 1.8 -30 -180 10M 100k RL = 100kΩ SUPPLY VOLTAGE (V) -144 10k RL = 1kΩ 80 -40 1k 80 RL = 10kΩ 100 -30 100 60 140 VDD = 3V 100 0.001 PHASE (DEGREES) 30 40 VCM = 0 VOUT = VDD/2 RL REFERENCED TO GND 160 400 MAX4249/MAX4255/MAX4256/MAX4257 GAIN AND PHASE vs. FREQUENCY 40 180 VDD = 5V MAX4250–MAX4254 GAIN AND PHASE vs. FREQUENCY 50 20 INPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE OUTPUT VOLTAGE (V) MAX4249-57 TOC16 0 60 5.3 5.5 VDD = 3V, 5V RL = 50kΩ CL = 20pF AV = 1000 -20 TEMPERATURE (°C) SUPPLY VOLTAGE (V) 60 GAIN (dB) 4.8 40 1000 0 1.8 6 SUPPLY CURRENT (µA) 400 20 2000 SHUTDOWN SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 0.5 SHDN = VDD 0.373 340 0 SUPPLY CURRENT vs. OUTPUT VOLTAGE 0.6 420 0.374 SHDN = VSS 360 MAX4249-57 TOC14 MAX4249-57 TOC13 PER AMPLIFIER SHDN = VDD 380 TEMPERATURE (°C) SUPPLY CURRENT AND SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 440 400 MAX4249-57 TOC18 50 RL = 10kΩ VOUT = 20mV TO 4.975mV RL = 1kΩ VOUT = 150mV TO 4.75mV 0.375 420 PSRR- 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) Maxim Integrated SHUTDOWN SUPPLY CURRENT (µA) AV (dB) 90 60 440 115 100 0.376 MAX4249-57 TOC15 RL = 2kΩ 110 RL REFERENCED TO VDD/2 VDD = 5V VOS (µV) AV (dB) 120 120 MAX4249-57 TOC12 PER AMPLIFIER SUPPLY CURRENT (µA) RL = 20kΩ 130 SUPPLY CURRENT AND SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 460 PHASE (DEGREES) PSRR (dB) RL = 200kΩ 140 125 MAX4249-57 TOC10 150 LARGE-SIGNAL VOLTAGE GAIN vs. TEMPERATURE MAX4249-57 TOC11 LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/!Hz for all distortion measurements, TA = +25°C, unless otherwise noted.) INPUT VOLTAGE-N0ISE DENSITY vs. FREQUENCY 1 AV = 1 (MAX4250–MAX4254) 0.1 1k 100k 1M 10M 100 -100 HD2 HD4 VOUT = 4VP-P fO = 1kHz 0 VIN -20 -40 100kΩ 11kΩ -80 10 AV = 10 VIN fO = 3kHz FILTER BW = 30kHz VO RL 1 HD2 -100 HD5 MAX4250–MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE (VDD = 5V) VO 10kΩ fO -60 1s/div 100k THD+N (%) fO HD3 100kΩ 11kΩ 0.1 RL = 1kΩ 0.01 HD3 RL = 10kΩ -120 -140 -140 5k 10k 15k 10 20k 5k MAX4250–MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING (VDD = 3V) 0.1 100kΩ 0 1 VOUT RL 100kΩ 1 0.001 fO = 20kHz, FILTER BW = 80kHz 0 1 2 3 OUTPUT VOLTAGE (VP-P) 4 5 0.1 R1 5 R2 AV = 100 R1 = 560Ω, R2 = 53kΩ 0.01 R1 = 5.6kΩ, R2 = 53kΩ 0.0001 10 AV = 10 FILTER BW = 22kHz RL = 10kΩ TO GND VO = 2VP-P AV = 1 4 VOUT RL 0.001 3 3 VIN fO = 3kHz, FILTER BW = 30kHz 2 2 MAX4250–MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY RL = 100kΩ OUTPUT VOLTAGE (VP-P) Maxim Integrated 11kΩ 0.01 RL = 10kΩ AV = 10 fO = 3kHz FILTER BW = 30kHz 1 OUTPUT VOLTAGE (VP-P) VIN AV = 10 0.1 RL = 1kΩ 0.01 RL = 100kΩ 0 MAX4249/MAX4255/MAX4256/MAX4257 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING THD+N (%) 11kΩ VOUT RL 1 MAX4249-57 TOC25 VIN 1 0.001 20k FREQUENCY (Hz) FREQUENCY (Hz) 10 15k 10k THD+N (%) 10 MAX4249-57 TOC26 -160 THD+N (%) 10k MAX4249-57 TOC23 20 AMPLITUDE (dBc) -60 0.001 1k MAX4249/MAX4255/MAX4256/MAX4257 FFT OF DISTORTION AND NOISE RL = 1kΩ fO = 1kHz AV = 1 MAX4249-57 TOC21 VP-PNOISE = 760nVP-P 0 MAX4250–MAX4254 FFT OF DISTORTION AND NOISE -40 AMPLITUDE (dBc) 5 FREQUENCY (Hz) -20 -120 10 FREQUENCY (Hz) VOUT = 2VP-P -80 200nV/div 15 10 MAX4249-57 TOC22 0 10k 20 MAX4249-57 TOC24 10 25 VDD = 3V OR 5V MAX4249-57 TOC27 100 0.1Hz TO 10HzP-P NOISE 30 MAX4249-57 TOC20 AV = 10 (MAX4249/MAX4255/ MAX4256/MAX4257) Vn-EQUIVALENT INPUT NOISE-VOLTAGE (nV/√Hz) OUTPUT IMPEDANCE (Ω) 1000 MAX4249-57 TOC19 OUTPUT IMPEDANCE vs. FREQUENCY 100 1k 10k FREQUENCY (Hz) 7 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Typical Operating Characteristics (continued) (VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/!Hz for all distortion measurements, TA = +25°C, unless otherwise noted.) MAX4250–MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1.5V 0.01 THD+N(%) RL TO VDD/2 RL TO GND VOUT 200mV/div RL TO VDD 0.5V 0.001 0.0001 10 100 1k MAX4249-57 TOC30 FILTER BW = 80kHz AV = 1 RL = 1kΩ VOUT = 2VP-P MAX4250–MAX4254 SMALL-SIGNAL PULSE RESPONSE MAX4249-57 TOC29 MAX4249-57 TOC28 0.1 MAX4250–MAX4254 LARGE-SIGNAL PULSE RESPONSE 0.6V VOUT 20mV/div VDD = 3V RL = 10kΩ CL = 100pF VIN = 1V PULSE VDD = 3V RL = 10kΩ CL = 100pF VIN = 100V PULSE 0.5V 2µs/div 2µs/div 10k FREQUENCY (Hz) 1.6V VOUT 200mV/div 1V VDD = 3V RL = 10kΩ CL = 100pF VIN = 100mV PULSE AV = 10 2µs/div VOUT 50mV/div 1.5V VDD = 3V RL = 10kΩ CL = 100pF VIN = 10mV PULSE AV = 10 2µs/div CHANNEL SEPARATION vs. FREQUENCY 130 CHANNEL SEPARATION (dB) MAX4249-57 TOC32 2V 140 MAX4249-57 TOC33 MAX4249/MAX4255/MAX4256/MAX4257 SMALL-SIGNAL PULSE RESPONSE MAX4249-57 TOC31 MAX4249/MAX4255/MAX4256/MAX4257 LARGE-SIGNAL PULSE RESPONSE 120 110 100 90 80 70 0 1k 10k 100k 1M 10M FREQUENCY (Hz) 8 Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Pin/Bump Description PIN/BUMP MAX4250/ MAX4255 MAX4251/ MAX4256 MAX4252/ MAX4257 MAX4252 5-PIN SOT23 8-PIN SO/µMAX 8-PIN SO/µMAX 8-BUMP UCSP 10-BUMP UCSP 10-PIN µMAX 14-PIN SO 14-PIN SO 1 6 1, 7 A1, A3 A1, C1 1, 9 1, 13 1, 7, 8, 14 OUT, OUTA, OUTB, OUTC, OUTD 2 4 4 C2 B4 4 4 11 VSS 3 3 3, 5 C1, C3 A3, C3 3, 7 3, 11 3, 5, 10, 12 4 2 2, 6 B1, B3 A2, C2 2, 8 2, 12 2, 6, 9, 13 5 7 8 A2 B1 10 14 4 MAX4249/ MAX4253 MAX4254 NAME IN+, INA+, INB+, INC+, IND+ IN-, INA-, INB-, INC-, INDVDD FUNCTION Amplifier Output Negative Supply. Connect to ground for singlesupply operation Noninverting Amplifier Input Inverting Amplifier Input Positive Supply Shutdown Input, Connect to VDD or leave unconnected for normal operation (amplifier(s) enabled). — 8 — — A4, C4 5, 6 6, 9 — SHDN, SHDNA, SHDNB — 1, 5 — — — — 5, 7, 8, 10 — N.C. No Connection. Not internally connected. — — — B2 B2, B3 — — — — Not populated with solder sphere Detailed Description The MAX4249–MAX4257 single-supply operational amplifiers feature ultra-low noise and distortion while consuming very little power. Their low distortion and low noise make them ideal for use as preamplifiers in wide dynamic-range applications, such as 16-bit analog-todigital converters (see Typical Operating Circuit). Their high-input 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 output operation, drive loads as low as 1k" while maintaining DC accura- Maxim Integrated cy, and can drive capacitive loads up to 400pF without oscillation. The input common-mode voltage range extends from VDD - 1.1V to 200mV beyond the negative rail. The push-pull output stage maintains excellent DC characteristics, while delivering up to ±5mA of current. The MAX4250–4254 are unity-gain stable, whereas, the MAX4249/MAX4255/MAX4256/MAX4257 have a higher slew rate and are stable for gains # 10V/V. The MAX4249/MAX4251/MAX4253/MAX4256 feature a lowpower shutdown mode, which reduces the supply current to 0.5µA and disables the outputs. The MAX4250AAUK is specified for operation over the automotive (-40°C to +125°C) temperature range. 9 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps 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. Large-value feedback resistors can significantly improve distortion. 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. 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 # 10V/V, the decompensated devices MAX4249/MAX4255/MAX4256/MAX4257 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 400pF, do not significantly affect distortion results. Distortion performance remains relatively constant over supply voltages. CZ RF RG VOUT VIN Figure 1. Adding Feed-Forward Compensation AV = 2V/V RF = RG = 10kΩ VIN = 50mV/div 100mV 0 VOUT = 100mV/div 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 RF = 100k", RG = 11k" (AV = 10V/V) is en = 15nV/!Hz, en can be reduced to 9nV/!Hz by choosing RF = 10k", RG = 1.1k" (AV = 10V/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 low (9nV/!Hz). 2µs/div Figure 2a. Pulse Response with No Feed-Forward Compensation AV = 2 RF = RG = 100kΩ CZ = 11pF 100mV 50mV/div VIN 0 100mV/div VOUT 2µs/div Figure 2b. Pulse Response with 10pF Feed-Forward Compensation 10 Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Using a Feed-Forward Compensation Capacitor, CZ RISO VOUT CL MAX4250 MAX4251 MAX4252 MAX4253 MAX4254 VIN CZ = 11 x (RF / RG) [pF] Figure 3. Overdriven Input Showing No Phase Reversal 4.25V VOUT 0 4.45V VIN -200mV 0 The amplifier’s input capacitance is 11pF. 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: In the unity-gain stable MAX4250–MAX4254, the use of a proper C Z is most important for A V = 2V/V, and A V = -1V/V. In the decompensated MAX4249/ MAX4255/MAX4256/MAX4257, CZ 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" (MAX4250–MAX4254) or greater than 5k" (MAX4249/MAX4255/MAX4256/ MAX4257). Applications Information The MAX4249–MAX4257 combine good driving capability with ground-sensing input and rail-to-rail output operation. With their low distortion, low noise, and lowpower consumption, these devices are ideal for use in portable instrumentation systems and other low-power, noise-sensitive applications. AV = 1 VDD = 5V RL = 10kΩ 20µs/div Figure 4. Rail-to-Rail Output Operation Ground-Sensing and Rail-to-Rail Outputs 5V VOUT 1V/div 0 VDD = 5V RL = 10kΩ AV = 10 f = 1kHz Output Loading and Stability 200µs/div Figure 5. Capacitive-Load Driving Circuit Maxim Integrated 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 = 10V/V. The output swings to within 8mV of the supplies with a 10k" load, making the devices ideal in low-supplyvoltage applications. Even with their low quiescent current of 400µA, these amplifiers can drive 1k" loads while maintaining excellent DC accuracy. Stability while driving heavy capacitive loads is another key feature. 11 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps 4.5 140 4.0 RISO (Ω) 120 100 80 60 SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR. 40 20 0 10 100 1000 10,000 CAPACITIVE LOADING (pF) Figure 6. Isolation Resistance vs. Capacitive Loading to Minimize Peaking (<2dB) MAX4250–MAX4254 (AV = 1) MAX4249/MAX4255–MAX4257 (AV = 10) RISO = 0 PEAKING (dB) SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR. 10 5 0 10 100 1000 CAPACITIVE LOAD (pF) Figure 7. Peaking vs. Capacitive Load 12 3.5 3.0 2.5 2.0 1.5 SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR. 1.0 0.5 0 10 100 1000 10,000 NOTE: RISO CHOSEN FOR PEAKING <2dB. Figure 8. MAX4250–MAX4254 Unity-Gain Bandwidth vs. Capacitive Load These devices maintain stability while driving loads up to 400pF. To drive higher capacitive loads, place a small isolation resistor in series between the output of the amplifier and the capacitive load (Figure 5). This resistor improves the amplifier’s phase margin by isolating the capacitor from the op amp’s output. Reference Figure 6 to select a resistance value that will ensure a load capacitance that limits peaking to <2dB (25%). For example, if the capacitive load is 1000pF, the corresponding isolation resistor is 150". Figure 7 shows that peaking occurs without the isolation resistor. Figure 8 shows the unity-gain bandwidth vs. capacitive load for the MAX4250–MAX4254. 25 15 VDD = 3V CAPACITIVE LOAD (pF) NOTE: USING AN ISOLATION RESISTOR REDUCES PEAKING. 20 UNITY-GAIN BANDWIDTH (MHz) 160 10,000 Power Supplies and Layout The MAX4249–MAX4257 operate from a single 2.4V to 5.5V power supply or from dual supplies of ±1.20V to ±2.75V. For single-supply operation, bypass the power supply with a 0.1µF ceramic 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. Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Typical Operating Circuit 5V VDD 50kΩ 2 MAX195 7 MAX4256 (16-BIT ADC) 6 3 VIN 4 8 AIN DOUT SHDN SCLK SERIAL INTERFACE CS 5kΩ REF VSS -5V 4.096V SHDN Selector Guide PART GAIN BANDWIDTH (MHz) MINIMUM STABLE GAIN (V/V) NO. OF AMPLIFIERS PER PACKAGE SHUTDOWN MODE MAX4249 22 10 2 Yes MAX4250/A 3 1 1 — MAX4251 3 1 1 Yes MAX4252 3 1 2 — MAX4253 3 1 2 Yes PIN-PACKAGE 10-pin µMAX, 14-pin SO 5-pin SOT23 8-pin µMAX/SO 8-pin µMAX/SO, 8-bump UCSP 10-pin µMAX, 14-pin SO, 10-bump UCSP MAX4254 3 1 4 — 14-pin SO MAX4255 22 10 1 — 5-pin SOT23 MAX4256 22 10 1 Yes 8-pin µMAX/SO MAX4257 22 10 2 — 8-pin µMAX/SO Maxim Integrated 13 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Pin/Bump Configurations (continued) TOP VIEW OUT 5 N.C. 1 VDD IN- 2 MAX4250 MAX4250A MAX4255 VSS 2 IN+ 3 IN+ 4 VSS 4 IN- INA- 2 3 OUTA 1 10 VDD MAX4249 MAX4253 8 SHDN OUTA 1 7 VDD INA- 2 6 OUT INA+ 5 N.C. MAX4252 MAX4257 3 VSS 4 µMAX/SO + OUTA 1 MAX4251 MAX4256 3 SOT23 INA+ + + + 1 9 OUTB INA- 8 INB- INA+ VDD 7 OUTB 6 INB- 5 INB+ µMAX/SO 14 VDD OUTA 1 + 14 OUTD 2 13 OUTB INA- 2 13 IND- 3 12 INB- INA+ 3 12 IND+ VSS 4 7 INB+ VSS 4 SHDNA 5 6 SHDNB N.C. 5 µMAX + 8 MAX4249 MAX4253 MAX4254 11 INB+ VDD 4 10 N.C. INB+ 5 10 INC+ SHDNA 6 9 SHDNB INB- 6 9 INC- N.C. 7 8 N.C. OUTB 7 8 OUTC SO 11 VSS SO Ordering Information (continued) PART MAX4251ESA+ TEMP RANGE PINPACKAGE -40°C to +85°C 8 SO TOP MARK — MAX4251EUA+ -40°C to +85°C 8 µMAX — MAX4252EBL+T -40°C to +85°C 8 UCSP AAO MAX4252ESA+ -40°C to +85°C 8 SO — MAX4252EUA+ -40°C to +85°C 8 µMAX — MAX4253EBC+T -40°C to +85°C 10 UCSP AAK MAX4253EUB+ -40°C to +85°C 10 µMAX — MAX4253ESD+ -40°C to +85°C 14 SO — MAX4254ESD+ -40°C to +85°C 14 SO MAX4255EUK+T -40°C to +85°C 5 SOT23 MAX4256ESA+ -40°C to +85°C 8 SO MAX4256EUA+ -40°C to +85°C 8 µMAX — MAX4257ESA+ -40°C to +85°C 8 SO — MAX4257ESA/V+T -40°C to +85°C 8 SO — MAX4257EUA+ -40°C to +85°C 8 µMAX — 14 — ACCJ — Maxim Integrated MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, 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. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SOT-23 U5+2 21-0057 90-0174 8 µMAX U8+1 21-0036 90-0092 10 µMAX U10+2 21-0061 90-0330 3 x 3 µCSP B9+5 21-0093 — 14 SOIC S14+1 21-0041 90-0112 12 µCSP B12+4 21-0104 — Maxim Integrated 15 MAX4249–MAX4257 UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps Revision History REVISION NUMBER REVISION DATE 8 10/11 Added lead-free packaging to the Ordering Information and changed the Input Bias Current and Input Offset Current conditions in the Electrical Characteristics table 9 12/12 Added MAX4257ESA/V+T to Ordering Information. DESCRIPTION PAGES CHANGED 1, 2, 14 14 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated 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. 16 © 2012 Maxim Integrated Products, Inc. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.