Maxim - Application Notes

Maxim - Application Notes http://www.maxim-ic.com Maxim - Whats New en Copyright 2009, Maxim Integrated Products, Inc. Tue, 24 Nov 2009 12:29:11 GMT http://www.maxim-ic.com/new info2@maxim-ic.com (Info2) info2@maxim-ic.com (Info2) 10 Maxim - Application Notes http://media.maxim-ic.com/maxkit/images/max_logo_header.gif http://www.maxim-ic.com 88 31 Maxim Logo Sequencing with the MAX16046 System-Management IC http://www.maxim-ic.com/appnotes.cfm/an_pk/4631 Complex devices such as CPUs, ASICs, FPGAs, and memories commonly require power-supply sequencing. The MAX16046 provides a highly integrated solution for sequencing, monitoring, and power-supply margining. This application note presents an example system using multiple devices with specific sequencing requirements, and provides a step-by-step implementation using the MAX16046. http://www.maxim-ic.com/appnotes.cfm/an_pk/4631 Tue, 24 Nov 2009 12:29:11 GMT Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V http://www.maxim-ic.com/appnotes.cfm/an_pk/4477 Designers need open-drain logic to run at 1.8V at the 1-Wire master IO. Most 1-Wire slave devices cannot run at 1.8V. This application note presents an RD (reference design) of a circuit that translates from a 1.8V 1-Wire master to a 5V 1-Wire slave device. The RD is used for driving typical 1-Wire slave devices. The MAX3394E voltage-level translator is featured in the design. http://www.maxim-ic.com/appnotes.cfm/an_pk/4477 Tue, 24 Nov 2009 12:29:11 GMT Nonvolatile STANDBY/ON Switch http://www.maxim-ic.com/appnotes.cfm/an_pk/4624 Using an electronically programmable voltage reference (DS4305) as a single-bit nonvolatile memory cell, this circuit remembers the state of a STANDBY/ON switch that changes state with no operator present. http://www.maxim-ic.com/appnotes.cfm/an_pk/4624 Tue, 24 Nov 2009 12:29:11 GMT Integrated Solutions Make Analog Filter Design Easy http://www.maxim-ic.com/appnotes.cfm/an_pk/4422 This application note explains advances of switched-capacitor analog filters for anti-aliasing and noise filtering for ADCs (analog-to-digital converters), as well as "reconstruction" post-filtering for DACs (digital-to-analog converters). The article summarizes the unique benefits of the MAX74xx series filter vs. continuous-time active filters and provides application examples. http://www.maxim-ic.com/appnotes.cfm/an_pk/4422 Tue, 24 Nov 2009 12:29:11 GMT Reference Design for a High-Input-Voltage, High-Output-Current Buck Controller Using the MAX15046 http://www.maxim-ic.com/appnotes.cfm/an_pk/4376 This reference design presents a circuit for using the MAX15046 step-down power-supply controller for high-input-voltage, low-output-voltage applications that require high output current. http://www.maxim-ic.com/appnotes.cfm/an_pk/4376 Tue, 24 Nov 2009 12:29:11 GMT ADC Input Translator http://www.maxim-ic.com/appnotes.cfm/an_pk/4617 Using resistor dividers to scale the differential inputs and a stable voltage reference to offset the inputs, this circuit enables an ADC with 0V to 5V input range (MAX1402) to accept inputs in the range +10.5V to -10.5V. http://www.maxim-ic.com/appnotes.cfm/an_pk/4617 Tue, 24 Nov 2009 12:29:11 GMT Choosing the Right Power-Supply IC for your Application http://www.maxim-ic.com/appnotes.cfm/an_pk/737 This article discusses the process of choosing a power supply for a given application. It reviews the features of the three most common types of DC-DC converting power-supply ICs. It also provides links to other application notes and tutorials that discuss more advanced topics. http://www.maxim-ic.com/appnotes.cfm/an_pk/737 Tue, 24 Nov 2009 12:29:11 GMT Constant-Power Source http://www.maxim-ic.com/appnotes.cfm/an_pk/4470 This circuit delivers constant power to a varying load. Using a load-monitoring IC (MAX4210), it senses the load current and load voltage independently, and multiplies the corresponding signals together with an internal analog multiplier. Applying the multiplier output to the inverting input of an error amplifier lets you apply a control voltage to set the constant-power level. http://www.maxim-ic.com/appnotes.cfm/an_pk/4470 Tue, 24 Nov 2009 12:29:11 GMT Bipolar Stepper-Motor Driver has Few Components http://www.maxim-ic.com/appnotes.cfm/an_pk/4469 As an alternative to the otherwise complex driver circuit for a stepper motor, this approach employs a tiny, surface-mount 2.8W class D audio amplifier that normally drives 4W or 8W speakers. Two internal H-bridges drive the output pairs OUTR± and OUTL±, which connect directly to the A and B windings of the stepper motor. Each pair carries a differential PWM signal with a nominal center frequency of 1.22MHz. http://www.maxim-ic.com/appnotes.cfm/an_pk/4469 Tue, 24 Nov 2009 12:29:11 GMT 4.096V, 80mA Precision Reference http://www.maxim-ic.com/appnotes.cfm/an_pk/4474 You can boost the output-current capability of a voltage-reference IC without degrading its output accuracy, by adding an NPN-transistor buffer in the feedback loop of the IC's error amplifier. The circuit shown enables a MAX6033A reference to deliver as much as 80mA. http://www.maxim-ic.com/appnotes.cfm/an_pk/4474 Tue, 24 Nov 2009 12:29:11 GMT Process Control and PLC Tutorial http://www.maxim-ic.com/appnotes.cfm/an_pk/4603 Programmable logic controllers (PLC) save time, money, and energy in process control systems. They simplify systems. A brief history of manufacturing processes sets the stage for how to use modern ICs to replace discrete components. The ICs allow easy system design and extend monitoring to improve equipment and personnel safety. The MAX15500/MAX15501, MAX5661, and MAX5134–MAX5139 serve as examples of ICs in process control. http://www.maxim-ic.com/appnotes.cfm/an_pk/4603 Tue, 24 Nov 2009 12:29:11 GMT Multiple-Pulse Generator Aids IC Testing http://www.maxim-ic.com/appnotes.cfm/an_pk/4626 Comprising a quad op amp, logic gate, pushbutton switch, debounce circuit, and D flip-flop, this circuit substitutes for a microcontroller or arbitrary-waveform generator in producing the serial digital codes needed to program a single IC input. http://www.maxim-ic.com/appnotes.cfm/an_pk/4626 Tue, 24 Nov 2009 12:29:11 GMT A Simple 1-Wire® DAC http://www.maxim-ic.com/appnotes.cfm/an_pk/4627 Connecting the outputs of a 1-Wire addressable switch (DS2408) to a resistor network allows the 1-Wire interface to control a simple DAC. This idea is illustrated by the presentation of an LED-brightness controller. http://www.maxim-ic.com/appnotes.cfm/an_pk/4627 Tue, 24 Nov 2009 12:29:11 GMT Simple Circuit Prevents USB Current Overshoot During Insertion http://www.maxim-ic.com/appnotes.cfm/an_pk/4621 When generating 5V for a USB port, this circuit limits peak inrush currents at the moment of insertion (at the USB connector), and and also limits the operating current to 500mA, as required by the port. http://www.maxim-ic.com/appnotes.cfm/an_pk/4621 Tue, 24 Nov 2009 12:29:11 GMT Improve Current Measurement Accuracy by Skewing the Input Offset Voltage on Current-Sense Amplifiers http://www.maxim-ic.com/appnotes.cfm/an_pk/4170 Some applications require that the input offset voltage (VOS) of current-sense amplifiers be calibrated to enhance measurement accuracy. This is not a straightforward task because of interactions between the output voltage low (VOL) and the input VOS. This application note outlines a simple method to artificially "skew" the input VOS of unidirectional current-sense amplifiers. The method allows measurement of total-input VOS without the normal limitations from VOL, and improves the overall accuracy of current measurements. The MAX4080 current-sense amplifier serves as the example of the technique. http://www.maxim-ic.com/appnotes.cfm/an_pk/4170 Tue, 24 Nov 2009 12:29:11 GMT