Application Note 830: 2001 MAX1407 Complete Data Acquisition Syst

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Application Note 830: 2001 MAX1407 Complete Data Acquisition Syst

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CONVERSION/SAMPLING CIRCUITS MEASUREMENT CIRCUITS
Application Note 830: 2001
MAX1407 Complete Data Acquisition System Simplifies Your System Designs
design example portable data acquisition system offered that greatly simplifies circuit design task. reduction from seven components down three components accomplished with design that lower system cost, faster time-to-market, smaller size, better performance, higher reliability. hardware design portable measurement system more complicated than just choosing right meet required electrical performance. There many tradeoffs considered. there size constraints with board area height? What does total system cost, including components, assembly, final test, need important time-to-market have associated risks been identified? What product life cycle? what environment will product used what reliability requirements? extreme discrete design using readily available standard components other extreme custom design using single mixed-signal chip. following will compare discrete design design using MAX1407. Figure shows functional block diagram portable data acquisition system (DAS) using discrete components. system includes power, analog, digital circuitry. power derived from batteries, with power supply regulated output voltage. battery voltage measured demand with converter there reset circuits battery regulated output voltage. analog includes analog front (AFE) circuitry (which include converters, opamps, analog switches) interface with electrochemical sensor, thermistor circuit measure temperature, converter with input multiplexer, voltage reference with AFE, thermistor, converter. digital circuitry includes 32kHz oscillator, real-time clock (RTC), microcontroller (µC) including high-frequency crystal, external interrupts user interface, internal memory, possibly other peripherals, such liquid crystal display (LCD) bias driver circuit interface LCD.
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Figure Portable system functional block diagram with discrete standard components sensor shown Figure electrochemical type sensor configured counter configuration where working electrode (WE) biased pin. external resistor between OUT1 configures force/sense converter transimpedance amplifier measure current through sensor. reference electrode (RE) biased pin, feedback loop closed through sensor impedance OUT2 regulate constant potential between over varying sensor currents. Figure shows functional block diagram same portable using MAX1407, simplifying system design greatly. MAX1407 contains circuitry required AFE, including multiplexer, converter, voltage reference. also ability measure battery supply voltages. Also included digital functions, including reset circuits, 32kHz oscillator with RTC, wake-up circuitry, power supply control, high-frequency clock output drive addition, blocks MAX1407 individually controlled powered down serial interface. sensor application shown just many ways this flexible configured.
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Figure Portable system functional block diagram using MAX1407/14 There many benefits with using MAX1407 with similar devices, such MAX1408, MAX1409, MAX1414, system requirements different). These lower system cost, faster time-to-market, smaller size, better performance, higher reliability. Table Table MAX1407/MAX1408/MAX1409/MAX1414 Selector Table Differential Total Data Input Force/ Part Auxilary Ready Detection Sense Number Analog Analog Interrupt Threshold DACs Inputs Inputs Signal (mV) MAX1407 DIFF MAX1408 DIFF MAX1409 DIFF MAX1414 DIFF
External Power Supply Control
3-State Digital Output
system cost lower many reasons. There fewer components, resulting lower component cost using competitively priced MAX1407. assembly final test cost will much lower because total insertion cost lower fewer components, there much less test verify board level. Also, features included within MAX1407 eliminate some functionality such RTC, reset, converter, resulting greater selection lower cost from which choose. time-to-market faster because analog design large part system design been incorporated MAX1407. board design debug time will faster because there less components manage. Once first design been completed, will very easy spin-off www.maxim-ic.com/an830 Page
designs long analog measurement system doesn't change significantly. changes user interface, software features, memory requirements, display then fairly simple change software select another same family provide product variation improved feature very short time. system size should smaller easier into required form factor because there less components traces route printed circuit board. performance should better than discrete design because functional blocks have been optimized operate data acquisition system that will connect seamlessly power supply, necessary without additional circuitry. reliability also improved fewer components. MAX1407/08/09/14 family combines analog system support circuitry required portable non-portable data acquisition system connects seamlessly inexpensive, standard Table shows comparison design paths quantitatively rates important items consider when embarking system design. MAX1407 provides superior solution discrete design when these metrics considered together. Table Comparison System Design Paths Metric MAX1407 (2-3 IC's) Analog Performance Reliability Small Size Time Market Ease Spin-offs System Cost Overall Rating Note: worst best, relative other solution. October 2001 DISCRETE (6-12 IC's)
MORE INFORMATION MAX1407: QuickView MAX1408: QuickView MAX1409: QuickView MAX1414: QuickView
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Application Note 830: 2001 MAX1407 Complete Data Acquisition Syst

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