MAX44244/MAX44245/MAX V, Precision, Low-Power, 90µA, Single/Quad/Dual Op Amps

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1 EVALUATION KIT AVAILABLE MAX/MAX/MAX V, Precision, Low-Power, 9µA, General Description The MAX/MAX/MAX family of parts provide ultra-precision, low-noise, zero-drift single/quad/ dual operational amplifiers featuring very low-power operation with a wide supply range. The devices incorporate a patented auto-zero circuit that constantly measures and compensates the input offset to eliminate drift over time and temperature as well as the effect of /f noise. These devices also feature integrated EMI filters to reduce high-frequency signal demodulation on the output. The op amps operate from either a single.v to V supply or dual ±.V to ±V supply. The devices are unity-gain stable with a MHz gain-bandwidth product and a low 9µA supply current per amplifier. The low offset and noise specifications and high supply range make the devices ideal for sensor interfaces and transmitters. The devices are available in FMAXM, SO, SOT, and TSSOP packages and are specified over the -NC to +NC automotive operating temperature range. Sensors Interfaces -ma and tov Transmitters PLC Analog I/O Modules Weight Scales Portable Medical Devices Applications S Very Low Input Voltage Offset.µV (max) S Low nv/nc Offset Drift (max) S Low 9µA Quiescent Current per Amplifier S Low Input Noise nv/ Hz at khz.µv P-P from.hz to Hz S MHz Gain-Bandwidth Product S EMI Suppression Circuitry S Rail-to-Rail Output S.V to V Supply Range S µmax, SO, SOT, TSSOP packages Ordering Information appears at end of data sheet. Features For related parts and recommended products to use with this part, refer to µmax is a registered trademark of Products, Inc. Typical Operating Circuit LP+ MAX REF MAX DAC R V REF R MAX I SIG (-ma) R R SENSE LP- For pricing, delivery, and ordering information, please contact Maxim Direct at --9-, or visit Maxim s website at 9-; Rev ; /

2 ABSOLUTE MAXIMUM RATINGS to V SS...-.V to +V Common-Mode Input Voltage...(V SS -.V) to ( +.V) Differential Input Voltage IN_+, IN_-...V Continuous Input Current Into Any Pin... QmA Output Voltage to V SS (OUT_)....V to ( +.V) Output Short-Circuit Duration (OUT_)... s MAX/MAX/MAX V, Precision, Low-Power, 9µA, 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. PACKAGE THERMAL CHARACTERISTICS (Note ) SO- Junction-to-Ambient Thermal Resistance (B JA )...NC/W Junction-to-Case Thermal Resistance (B JC )...NC/W SO- Junction-to-Ambient Thermal Resistance (B JA )...NC/W Junction-to-Case Thermal Resistance (B JC )...NC/W SOT Junction-to-Ambient Thermal Resistance (B JA )...NC/W Junction-to-Case Thermal Resistance (B JC )...NC/W Operating Temperature Range... -NC to +NC Storage Temperature... -NC to +NC Junction Temperature...+NC Lead Temperature (soldering, s)...+nc Soldering Temperature (reflow)...+nc TSSOP Junction-to-Ambient Thermal Resistance (B JA )...NC/W Junction-to-Case Thermal Resistance (B JC )...NC/W FMAX Junction-to-Ambient Thermal Resistance (B JA )...NC/W Junction-to-Case Thermal Resistance (B JC )...NC/W Note : Package thermal resistances were obtained using the method described in JEDEC specification JESD-, using a four-layer board. For detailed information on package thermal considerations, refer to ELECTRICAL CHARACTERISTICS ( = V, V SS = V, V IN+ = V IN- = /, R L = ki to /, T A = -NC to +NC, unless otherwise noted. Typical values are at +NC.) (Note ) POWER SUPPLY PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range Guaranteed by PSRR. V Power-Supply Rejection Ratio (Note ) PSRR T A = +NC, V IN+ = V IN- = / - V -NC < T A < +NC T A = +NC 9 Quiescent Current per Amplifier I DD -NC < T A < +NC DC SPECIFICATIONS Input Common-Mode Range V CM Guaranteed by CMRR test Common-Mode Rejection Ratio (Note ) CMRR T A = +NC, V CM = V SS -.V to -.V -NC < T A < +NC, V CM = V SS -.V to -.V V SS -. T A = +NC. Input Offset Voltage (Note ) V OS -NC < T A < +NC Input Offset Voltage Drift (Note ) -. TC V OS nv/nc FA V FV

3 MAX/MAX/MAX V, Precision, Low-Power, 9µA, ELECTRICAL CHARACTERISTICS (continued) ( = V, V SS = V, V IN+ = V IN- = /, R L = ki to /, T A = -NC to +NC, unless otherwise noted. Typical values are at +NC.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T A = +NC Input Bias Current (Note ) I B -NC < T A < +NC T A = +NC Input Offset Current (Note ) I OS -NC < T A < +NC Open-Loop Gain (Note ) AVOL V SS +.V P V OUT P -.V T A = +NC -NC < T A < +NC Output Short-Circuit Current To or V SS, noncontinuous ma Output Voltage Swing AC SPECIFICATIONS - T A = +NC V OUT -NC < T A < +NC V OUT - T A = +NC V SS -NC < T A < +NC Input Voltage-Noise Density e N f = khz nv/ Hz Input Voltage Noise.Hz < f < Hz nv P-P Input Current-Noise Density i N f = khz. pa/ Hz Gain-Bandwidth Product GBW MHz Slew Rate SR A V = V/V, V OUT = V P-P. V/Fs Capacitive Loading C L No sustained oscillation, A V = V/V pf Total Harmonic Distortion Plus Noise EMI Rejection Ratio EMIRR V RF_PEAK = mv THD+N V OUT = V P-P, A V = +V/V, f = khz - f = MHz f = 9MHz f = MHz f = MHz 9 ELECTRICAL CHARACTERISTICS ( = V, V SS = V, V IN+ = V IN- = /, R L = ki to /, T A = -NC to +NC, unless otherwise noted. Typical values are at +NC.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY T A = +NC 9 Quiescent Current per Amplifier I DD -NC < T A < +NC DC SPECIFICATIONS Input Common-Mode Range V CM Guaranteed by CMRR test V SS pa pa mv FA V

4 MAX/MAX/MAX V, Precision, Low-Power, 9µA, ELECTRICAL CHARACTERISTICS (continued) ( = V, V SS = V, V IN+ = V IN- = /, R L = ki to /, T A = -NC to +NC, unless otherwise noted. Typical values are at +NC.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Common-Mode Rejection Ratio (Note ) CMRR T A = +NC, V CM = V SS -.V to -.V -NC < T A < +NC, V CM = V SS -.V to -.V T A = +NC. Input Offset Voltage (Note ) V OS -NC < T A < +NC Input Offset Voltage Drift (Note ) TC V OS nv/ C T A = +NC Input Bias Current (Note ) I B -NC < T A < +NC T A = +NC Input Offset Current (Note ) I OS -NC < T A < +NC Open-Loop Gain (Note ) A VOL V SS +.V P V OUT P -.V Note : All devices are % production tested at T A = +NC. Temperature limits are guaranteed by design. Note : Guaranteed by design. Note : At IN+ and IN-. Defined as log (V RF_PEAK /δv OS ). T A = +NC -NC < T A < +NC Output Short-Circuit Current To or V SS, noncontinuous ma Output Voltage Swing AC SPECIFICATIONS - T A = +NC V OUT -NC < T A < +NC V OUT - T A = +NC V SS -NC < T A < +NC Input Voltage-Noise Density e N f = khz nv/ Hz Input Voltage Noise.Hz < f < Hz nv P-P Input Current-Noise Density i N f = khz. pa/ Hz Gain-Bandwidth Product GBW MHz Slew Rate SR A V = V/V, V OUT = V P-P. V/Fs Capacitive Loading C L No sustained oscillation, A V = V/V pf Total Harmonic Distortion Plus Noise EMI Rejection Ratio THD+N V OUT = V P-P, A V = +V/V, f = khz - EMIRR V RF_PEAK = mv f = MHz f = 9MHz f = MHz f = MHz 9 FV pa pa mv

5 MAX/MAX/MAX V, Precision, Low-Power, 9µA, (T (V A DD = = + C, V, Vunless SS = V, otherwise V IN+ = Vnoted.) IN- = /, R L = kω to /. Typical values are at T A = + C.) OCCURANCE (%) INPUT OFFSET VOLTAGE HISTOGRAM..... INPUT OFFSET VOLTAGE (µv).. MAX toc OCCURANCE (%) INPUT OFFSET VOLTAGE DRIFT 9 INPUT OFFSET VOLTAGE DRIFT (nv/ C) Typical Operating Characteristics MAX toc SUPPLY CURRENT (µa) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) MAX toc SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE MAX toc OFFSET VOLTAGE (µv) INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE MAX toc OFFSET VOLTAGE (µv) INPUT OFFSET VOLTAGE VS. TEMPERATURE MAX toc - - TEMPERATURE ( C) COMMON-MODE VOLTAGE (V) TEMPERATURE ( C) INPUT BIAS CURRENT (pa) INPUT BIAS CURRENT VS. COMMON-MODE VOLTAGE MAX toc INPUT BIAS CURRENT (pa) - INPUT BIAS CURRENT vs. TEMPERATURE MAX toc COMMON-MODE VOLTAGE (V) TEMPERATURE ( C)

6 MAX/MAX/MAX V, Precision, Low-Power, 9µA, Typical Operating Characteristics (continued) ( = V, V SS = V, V IN+ = V IN- = /, R L = kω to /. Typical values are at T A = + C.) CMRR () COMMON-MODE REJECTION RATIO vs. FREQUENCY MAX toc9 CMRR () COMMON-MODE REJECTION RATIO vs. TEMPERATURE MAX toc PSRR () POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX toc VDD - VOUT (mv) - k k k M OUTPUT VOLTAGE HIGH vs. TEMPERATURE - - TEMPERATURE ( C) MAX toc VOUT - VSS (mv) TEMPERATURE ( C) OUTPUT VOLTAGE LOW vs. TEMPERATURE - - TEMPERATURE ( C) MAX toc VDD - VOUT (mv) - k k k M OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT. SOURCE CURRENT (ma) MAX toc VOUT - VSS (mv) OUTPUT VOLTAGE LOW vs. SINK CURRENT. SINK CURRENT (ma) MAX toc INPUT VOLTAGE NOISE (nv/ Hz) INPUT VOLTAGE NOISE vs. FREQUENCY k k k MAX toc

7 MAX/MAX/MAX V, Precision, Low-Power, 9µA, Typical Operating Characteristics (continued) ( = V, V SS = V, V IN+ = V IN- = /, R L = kω to /. Typical values are at T A = + C.) nv/div INPUT VOLTAGE.Hz TO Hz NOISE MAX toc INPUT-CURRENT NOISE (pa/ Hz) 9 INPUT CURRENT NOISE vs. FREQUENCY MAX toc SMALL-SIGNAL GAIN () SMALL-SIGNAL GAIN vs. FREQUENCY MAX toc9 - s/div k k k -. k k k M LARGE-SIGNAL GAIN () LARGE-SIGNAL GAIN vs. FREQUENCY MAX toc V IN mv/div V OUT mv/div SMALL-SIGNAL STEP RESPONSE MAX toc V IN V/div V OUT mv/div LARGE-SIGNAL STEP RESPONSE MAX toc - -. k k k M µs/div µs/div V/div POWER-UP TIME MAX toc - - TOTAL HARMONIC DISTORTION vs. FREQUENCY R LOAD = ki MAX toc V OUT V/div THD () R LOAD = I - R LOAD = ki µs/div - k k k

8 MAX/MAX/MAX V, Precision, Low-Power, 9µA, Typical Operating Characteristics (continued) ( = V, V SS = V, V IN+ = V IN- = /, R L = kω to /. Typical values are at T A = + C.) RESISTIVE LOAD (I) k k OUTPUT STABILITY vs. CAPACITIVE LOAD STABLE UNSTABLE MAX toc ISOLATION RESISTANCE (I) k k OUTPUT STABILITY vs. ISOLATION RESISTANCE STABLE UNSTABLE MAX toc CROSSTALK (),, CAPACITIVE LOAD (pf) CROSSTALK vs. FREQUENCY k k k M MAX toc OUTPUT IMPEDANCE (I),, 9 CAPACITIVE LOAD (pf) OUTPUT IMPEDANCE vs. FREQUENCY k k k M MAX toc EMIRR vs. FREQUENCY MAX toc9 EMIRR (),, FREQUENCY (MHz)

9 MAX/MAX/MAX V, Precision, Low-Power, 9µA, Pin Configurations TOP VIEW OUTA V SS + MAX N.C. INA- INA+ + MAX N.C. OUTA INA+ INA- V SS µmax N.C. SOT OUTD IND- OUTA INA- + IND- OUTA INA- + OUTD IND+ V SS INC+ INC- OUTC INA+ INB+ INB- OUTB MAX 9 INA+ IND+ MAX V SS INB+ INC+ INB- 9 INC- TSSOP OUTB SO- OUTC + MAX OUTB INB- INB+ OUTA INA- INA+ V SS + MAX OUTA INA- INA+ OUTB INB- V SS INB+ µmax SO- 9

10 PIN MAX MAX MAX SOT µmax SO- TSSOP SO- µmax MAX/MAX/MAX V, Precision, Low-Power, 9µA, NAME Pin Description FUNCTION OUTA Channel A Output V SS Negative Supply Voltage INA+ Channel A Positive Input INA- Channel A Negative Input Positive Supply Voltage INB+ Channel B Positive Input INB- Channel B Negative Input OUTB Channel B Output OUTC Channel C Output 9 9 INC- Channel C Negative Input INC+ Channel C Positive Input IND+ Channel D Positive Input IND- Channel D Negative Input OUTD Channel D Output,, N.C. No Connection. Not internally connected. Detailed Description The MAX/MAX/MAX are high-precision amplifiers with less than FV (typ) input-referred offset and low input voltage-noise density at Hz. /f noise, in fact, is eliminated to improve the performance in low-frequency applications. These characteristics are achieved through an auto-zeroing technique that cancels the input offset voltage and /f noise of the amplifier. External Noise Suppression in EMI Form These devices have input EMI filters to prevent effects of radio frequency interference on the output. The EMI filters comprise passive devices that present significant higher impedance to higher frequency signals. See the EMIRR vs. Frequency graph in the Typical Operating Characteristics section for details. High Supply Voltage Range The devices feature 9µA current consumption per channel and a voltage supply range from either.v to V single supply or ±.V to ±V split supply. Applications Information The devices feature ultra-high precision operational amplifiers with a high supply voltage range designed for load cell, medical instrumentation, and precision instrument applications. ma Current-Loop Communication Industrial environments typically have a large amount of broadcast electromagnetic interference (EMI) from highvoltage transients and switching motors. This combined with long cables for sensor communication leads to high-voltage noise on communication lines. Current-Loop communication is resistant to this noise because the EMI induced current is low. This configuration also allows for low-power sensor applications to be powered from the communication lines. The Typical Operating Circuit shows how the device can be used to make a current loop driver. The circuit uses low-power components such as the MAX op amp, the -bit MAX DAC, and the high-precision µa-only MAX reference. In this

11 MAX/MAX/MAX V, Precision, Low-Power, 9µA, circuit, both the DAC and the reference are referred to the local ground. The MAX op-amp inputs are capable of swinging to the negative supply (which is the local ground in this case). R acts as a current mirror with R SENSE. Therefore, if R SENSE = Ω (i.e. ma will drop V) and if the current through R is μa when I OUT is ma (.% error) then R = kω. R is chosen along with the reference voltage to provide the ma offset. R = kω for ma full scale or R = kω for % overrange. R SENSE is ratiometric with R, R independently sets the offset current and R independently sets the DAC scaling. Driving High-Performance ADCs The MAX/MAX/MAX s low input offset voltage and low noise make these amplifiers ideal for ADC buffering. Weight scale applications require a lownoise, precision amplifier in front of an ADC. Figure details an example of a load cell and amplifier driven from the same V supply, along with a -bit delta sigma ADC such as the MAX. The MAX is an ultra-low-power (< FA, max active current), high-resolution, serial output ADC. It provides the highest resolution per unit power in the industry and is optimized for applications that require very high dynamic range with low power such as sensors on a ma industrial control loop. The devices provide a high-accuracy internal oscillator that requires no external components. Layout Guidelines The MAX/MAX/MAX feature ultra-low input offset voltage and noise. Therefore, to get optimum performance follow the layout guidelines. Avoid temperature tradients at the junction of two dissimilar metals. The most common dissimilar metals used on a PCB are solder-to-component lead and solder-to-board trace. Dissimilar metals create a local thermocouple. A variation in temperature across the board can cause an additional offset due to Seebeck effect at the solder junctions. To minimize the Seebeck effect, place the amplifier away from potential heat sources on the board, if possible. Orient the resistors such that both the ends are heated equally. It is a good practice to match the input signal path to ensure that the type and number of thermoelectric juntions remain the same. For example, consider using dummy ω resistors oriented in such a way that the thermoelectric source, due to the real resistors in the signal path, are cancelled. It is recommended to flood the PCB with ground plane. The ground plane ensures that heat is distributed uniformly reducing the potential offset voltage degradation due to Seebeck effect. V V AMP A ½ MAX V R G R F R F V IN+ MAX V IN- V SS OUTPUT MICRO CONTROLLER AMP B ½ MAX Figure. Weight Application

12 MAX/MAX/MAX V, Precision, Low-Power, 9µA, PROCESS: BiCMOS Chip Information Ordering Information Package Information For the latest package outline information and land patterns (footprints), go to 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. PART TEMP RANGE PIN- PACKAGE TOP MARK MAXAUK+* - C to + C SOT AFMR MAXAUA+* - C to + C µmax MAXASD+ - C to + C SO MAXAUD+ - C to + C TSSOP MAXAUA+ - C to + C µmax MAXASA+ - C to + C SO PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PAT- TERN NO. SOT U SO S µmax U SO SM TSSOP UM Denotes a lead(pb)-free/rohs-compliant package. *Future Product Contact factory for availability.

13 MAX/MAX/MAX V, Precision, Low-Power, 9µA, Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED / Initial release / Added the MAX/MAX to data sheet. Updated the Electrical Characteristics, Absolute Maximum Ratings, Pin Description, and Pin Configurations. cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a product. No circuit patent licenses are implied. 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. Rio Robles, San Jose, CA 9 USA --- The Maxim logo and are trademarks of Products, Inc.