App note: Fundamentals of operation and recent developments of class D amplifiers

Good read about class D amplfiers from MAXIM Integrated. Link here (PDF) A Class D amplifier’s high efficiency makes it ideal for portable and compact high-power applications. Traditional Class D amplifiers require an external lowpass filter to extract the audio signal from the pulse-width-modulated (PWM) output waveform. Many modern Class D amplifiers, however, utilize advanced […]

App note: Avoid overvoltage stresses by minimizing power supply pumping on single-ended output, class D audio amplifiers

Here’s class D audio amplifier pumping remedy from MAXIM Integrated, power-supply pumping is a problem that occurs when playing low-frequency audio signals through a single-ended output. Link here (PDF) This application note explains what power-supply pumping is and how it occurs in designs that employ a Class D audio amplifier with single-ended output loads. The […]

App note: High-frequency automotive power supplies

Switching power supply used in automotive electronics app note from Maxim Integrated. Link here (PDF) The combination of high switching frequency and high-voltage capability is difficult to achieve in IC design. You can, however, design an automotive power supply that operates with high frequency if you protect it from temporary high-voltage conditions. High-frequency operation is […]

App note: Fan speed control is cool!

App note from Maxim Integrated about their MAX6650 and MAX6651 fan controllers chip. Link here (PDF) Temperature-based fan control is a necessity in a growing number of systems, both to reduce system noise and to improve fan reliability. When fan control is augmented by fan-speed monitoring, a speed-control loop can be implemented that is independent […]

App note: Choose the right power supply for your FPGA

Designing a power supply for FPGA includes multiple voltage, ripple management and power sequencing, here’s an app note from Maxim Integrated. Link here (PDF) Field-programmable gate arrays (FPGAs) and complex programmable logic devices (CPLDs) require 3 to 15, or even more, voltage rails. The logic fabric is usually at the latest process technology node that […]

App note: Current-sense amplifier doubles as a high common mode instrumentation amplifier

Application note from Maxim intergrated on utilizing a boost converter and a current-sense amplifier to form a regulator that derives +5V from -48V without isolation. Link here (PDF) Instrumentation amplifiers (IAs) are used where gain accuracy and dc precision are important, such as in measurement and test equipment. The downside of IAs is the cost. […]

App note: Microcontroller Clock – crystal, resonator, RC Oscillator, or silicon oscillator?

App note from Maxim Integrated on clock sources of microcontrollers and their strengths and weaknesses. Link here The majority of clock sources for microcontrollers can be grouped into two types: those based on mechanical resonant devices, such as crystals and ceramic resonators, and those based on electrical phase-shift circuits such as RC (resistor, capacitor) oscillators. […]

App note: Nonvolatile STANDBY/ON Switch

Power status recovery in this application note from Maxim Integrated. Link here (PDF) 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.

App note: Single-pushbutton ON/OFF power control

With the help of an MAX6816 debouncer from Maxim Integrated to form a single push button power switch. Link here (PDF) This application note presents a single-pushbutton power-control circuit. The design consists of an ON/OFF control circuit comprised of a push button, debouncer, and flip-flop. This circuit toggles the power output voltage by controlling an […]

App note: ASIC fixes for noisy analog “Oops”

App note from Maxim Integrated about simple fixes that can solve most issues when designing with ASICs. Link here (PDF) Noise is a common problem in mixed-signal ASICs, degrading performance and jeopardizing the completion of products. This application note gives hints and tips for adding external circuits that make many of these ASICs operational for […]

App note: Multiplex boosted class-D without additional external circuitry

An analog switch MAX14689 from MAXIM Integrated let signals that are higher than rail voltage pass. Link here (PDF) Boosted class-D amplifiers drive speakers with voltages greater than the supply voltage. These amplifiers are becoming more common because they allow higher performance audio from a single lithium ion battery. Most boosted class-D amplifiers, however, do […]

App note: Charging batteries using USB power

Fairly old application note from MAXIM Integrated about getting out power from USB ports. Link here (PDF) Many devices with rechargeable batteries use USB power to recharge the batteries while they are connected. This application note describes the power available from USB and how it can be used to charge batteries, including circuits and some […]

App note: Choose the right voltage regulator to extend battery life in wearables

App note from Maxim Integrated on wearable devices demanding reduced quiescent and shut down currents when in idle and in sleep mode in a voltage regulator. Link here Wearable devices have emerged as the next big market opportunity in the electronics industry. Smart watches are among the most popular wearable items today. The healthcare market, […]

App note: Voltage reference long-term stability reduces industrial process control calibration costs

Application note from Maxim Integrated about improved long term stability of their voltage references. Link here (PDF) Large industrial plants such as those in the oil, gas, electricity, pharmaceutical, and food and beverage industries rely on electronic instrumentation to provide accurate, stable measurements to control their processes. The stability of an instrument very much depends […]

App note: Add a “Black Box” fault logger to your “Big (or Small) Box” system

Application notes from Maxim Integrated on adding log functionalities in your system. Link here (PDF) This article describes how to add a “black box” functionality – nonvolatile fault logging – to networking, communications, industrial, and medical equipment. It outlines the benefits of recording fault data, including faster, more definitive failure analysis.

App note: Fundamentals of electronic security: Tampering with the easy targets

An app note from Maxim Integrated about tampering electronic securities through physical means and how to protect against it. Link here (PDF) More and more frequently, computer-based systems store valuable data and manage the flow of valuable commodities. If an opponent can gain control of the computer that touches this valuable data, they can access […]

App note: Passives aren’t really So Passive: PCB

The last part of “Passives aren’t really so passive” series app notes from Maxim Integrated discusses about PCB flaws that can lead to passive errors to IC performance. Link here (PDF) Active components like transistors and integrated circuits change signals using energy from the power supply. However, passive components like resistors, capacitors, inductors, and connectors […]

App note: Passives aren’t really So Passive: Resistors

Part 2 of the “Passives aren’t really so passive” series app notes from Maxim Integrated, this time about resistors and their tempco and tolerance degeneration that need to be considered. Link here (PDF) Passive components don’t draw power but even resistors can, and modify signals in unexpected ways. A resistor’s reaction to temperature, voltage, and […]

App note: Passives aren’t really So Passive: Capacitors

Interesting app note from Maxim Integrated on small parasitic effects of capacitors that makes them less passive. Link here (PDF) Active components like transistors and integrated circuits change signals using energy from the power supply. Conversely, passive components like resistors, capacitors, inductors, and connectors do not consume power or so we like to assume. However, […]

App note: Overview of USB battery charging revision 1.2 and the important role of charger detectors

Ever wonder why USB connector’s power are longer than the D+ D- pads?  Here’s an app note from Maxim Integrated about these detection proccess and their importance. Link here (PDF) This application note explains details of the USB Battery Charging Specification 1.2, and the role of charger detection. With the use of charger detection ICs, […]