MAX9934 Maxim, MAX9934 Datasheet
MAX9934
Available stocks
Related parts for MAX9934
MAX9934 Summary of contents
Page 1
... A chip select (CS) allows multiplexing of several MAX9934 current outputs to a single microcontroller ADC channel (see the Typical Operating Circuit ). CS is compatible with 1.8V and 3.3V logic systems. The MAX9934 is designed to operate from a 2.5V to 3.6V V supply, and draws just 120µA (typ) quiescent CC current. When powered down (V CC draw less than 0 ...
Page 2
... +25°C A MAX9934F -40°C ≤ T MAX9934T /dT OS MAX9934F Guaranteed by CMRR2 0 ≤ V ≤ +25° -40°C ≤ T 0.2V (MAX9934F) 0 ≤ V ≤ +25° -40°C ≤ T 0.2V (MAX9934T) -0.1 ≤ V ≤ 5. +25° -40°C ≤ T (MAX9934F) -0.1 ≤ V ≤ 5. +25° ...
Page 3
... R CM RS+ RS -40°C to +125°C, unless otherwise noted. Typical values are CONDITIONS MAX9934T G M MAX9934F T = +25°C A MAX9934T -40°C ≤ +25°C A MAX9934F -40°C ≤ T MAX9934T /dT ME MAX9934F 5.5V BRS ≤ 0. BRS 5. ...
Page 4
... PD V > 2.5V CC 0.1% final value, Figure 3, MAX9934T t PU 0.1% final value, Figure 3, MAX9934F = +25°C. Unless otherwise noted, specifications overtemperature are guaran- A ≤ 3.1V for the MAX9934T; 0.25V ≤ V OUT = 10kΩ to GND for unidirectional opera- OUT MIN TYP MAX UNITS 670 µs 220 150 µ ...
Page 5
... TCV (nV/NC) OS MAX9934T GAIN ERROR HISTOGRAM (%) MAX9934F GAIN ERROR DRIFT HISTOGRAM (PPM/°C) = 10kΩ to OUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE +125NC ...
Page 6
... V = 1.65V REF 2.0 BIDIRECTIONAL 1.5 1.0 0.5 GAIN = 5µA/mV 0 GAIN = 25µA/mV -0.5 -1.0 -1.5 -2.0 -40 - (mV) SENSE V vs 300 250 MAX9934F 200 150 MAX9934T 100 100 200 300 400 I (µA) OH SUPPLY CURRENT vs. TEMPERATURE 160 140 120 V = 5.5V CM 100 -40 -25 - 110 125 TEMPERATURE (° ...
Page 7
High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing (V = 3.3V 3.0V RS+ RS- SENSE V /2 for bidirectional operation +25°C, unless otherwise noted RS- BIAS ...
Page 8
... STEP OUT 0.9 0.8 0.7 0.6 MAX9934T 0.5 0.4 MAX9934F 0.3 0.2 0.1 0 1.00 0.10 0.01 PERCENTAGE OF FINAL VALUE (%) LARGE-SIGNAL INPUT STEP RESPONSE (MAX9934T) MAX9934 toc25 V SENSE 5mV/div 0.01% FINAL VALUE V 1% FINAL VALUE OUT 400µs/div CS DISABLED TRANSIENT RESPONSE C = 10pF (MAX9934T) OUT MAX9934 toc27 2V/div V OUT 1V/div 4µs/div 2V 1V ...
Page 9
... MAX9934 toc28 5mV/div 1V 1V 500mV/div = 0.1µF SATURATION RECOVERY TIME (MAX9934T) OUT OH MAX9934 toc30 UNIDIRECTIONAL V SENSE 10mV/div V OUT 1V/div 400µs/div = 10kΩ to OUT SATURATION RECOVERY TIME (MAX9934T) OUT OL MAX9934 toc29 UNIDIRECTIONAL V SENSE V OUT 400Fs/div 1V 1mV ...
Page 10
... MAX9934 supply Pin Description . Connect an SENSE % FINAL VALUE ...
Page 11
... Absolute Maximum Ratings section). The MAX9934 features a CS that can be used to dese- lect its output current-source. This allows multiple cur- rent-sense amplifier outputs to be multiplexed into a ...
Page 12
... Figure 4. Typical Application Circuit Showing Chip-Select Multiplexing Chip-Select Functionality for Multiplexed Systems The MAX9934 features a CS that can be used to dese- lect the output current - source achieving a high-imped- ance output with 0.1nA leakage current. Thus, different supply voltages can be used to power different MAX9934 devices that are multiplexed on the same bus ...
Page 13
... OUT BIAS outputs is zero. For positive input-sense voltages, the MAX9934 sources current causing its output voltage to rise above V . For negative input-sense voltages, BIAS the MAX9934 sinks current causing its output voltage to be lower than V , thus allowing bidirectional current BIAS sensing. ______________________________________________________________________________________ I ...
Page 14
... Figure 6. Multiplexed Amplifiers with Power Saving 14 ______________________________________________________________________________________ the current-sense application, the monitored load CC current (I LOAD across a current-sense resistor (R MAX9934 sources or sinks an output current that is pro- portional to V rent is provided to an output resistor (R an output voltage across R = 0V) the sensed load current 3.3V CC ...
Page 15
... Tables 1 and 2 are gain tables for unidirectional and bidirectional operation, respectively. They offer a few examples for both MAX9934 options having an output range of 3.1V unidirectional and ±1.65V bidirectional. Note that the output current of the MAX9934 adds to its quiescent current. This can be calculated as follows ...
Page 16
... RS-. Monitoring Very Low Currents The accuracy of the MAX9934 leads to a wide dynamic range. This applies to both unidirectional mode and bidirectional mode. This is made possible in the unidi- rectional mode because the output maintains gain ...
Page 17
... R/2 OUT Figure 8. Multiplexed, Strain-Gauge Amplifier Operation ______________________________________________________________________________________ V = 3.3V CC 0.1µF OUT1 IN1 MAX9934 3.3V CC 0.1µF OUT2 IN2 MAX9934 3.3V CC 0.1µF OUT3 IN3 MAX9934 CS TO EXTERNAL REFERENCE VOLTAGE V OUT 10kΩ CS1 MICROCONTROLLER CS2 CS3 R V REF 10kΩ ADC R (OPTIONAL) 17 ...
Page 18
... High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing TOP VIEW + OUT 2 MAX9934T/F GND 3 N.C. 4 µMAX Chip Information PROCESS: BiCMOS 18 ______________________________________________________________________________________ TOP VIEW (BUMPS ON BOTTOM) 8 RS+ RS+ 7 RS- RS N.C. CS Pin Configurations MAX9934T OUT GND UCSP ...
Page 19
... Current Output and Chip Select for Multiplexing For the latest package outline information and land patterns www.maxim-ic.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 ...
Page 20
... Current Output and Chip Select for Multiplexing For the latest package outline information and land patterns www.maxim-ic.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 ...
Page 21
... Removed future product references and updated lead temperature 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. ...