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App note: Simplify home audio systems With the PCM9211 – A versatile audio interface transceiver

Sunday, January 13th, 2019

A digital interface PCM9211 from Texas Instruments app note. Link here (PDF) Large-screen HDTVs are selling in huge volumes over last few years, primarily driven by amazing improvements in picture quality & form factor (thinner screens). The form factor constraints from having skinny screens result in tiny built-in speakers that...

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App note: Noise suppression for wireless headphones

Sunday, January 13th, 2019

Wireless headphone interference investigation from muRata. Link here Recently, the popularity of wireless headsets has been growing as the number of situations where people “play sports while listening to music” increases. Bluetooth is frequently used for communication between smartphones and headsets. However, audio can skip due to communication errors, so...

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App note: The Phytochrome system – Why use far-red?

Sunday, January 6th, 2019

App note from Würth Elektronik on why plants evolved to use far-red wavelengths and why it is essential for them. Link here (PDF) The light requirement of plants is now known to be far more complex than originally thought leading to the development of numerous LED technologies that produce a...

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App note: CeraLink® Capacitors

Sunday, January 6th, 2019

Compact and high capacitance ceramic capacitors from TDK electronics. Link here (PDF) CeraLink is a family of very compact capacitors for stabilizing voltages in the DC link. They are therefore suitable for use as either snubber or DC link capacitors. These products are based on PLZT ceramics and are designed...

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App note: Linear regulator specifications

Sunday, December 30th, 2018

Thorough items on a linear regulator datasheet provides valuable details about its proper usage discussed in this App note from ROHM semiconductor. Link here (PDF) A linear regulator data sheet includes a specifications table that lists output voltage values and precision. Besides, very important information such as maximum ratings, operating...

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App note: Connecting LDOs in parallel

Sunday, December 30th, 2018

App note from ROHM semiconductor on combining LDOs for higher load capacity. Link here (PDF) When you want to increase the output current capacity of an LDO, or when the power dissipation of a single LDO is insufficient, you might think of connecting LDOs in parallel if you need to...

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App note: Basics and low-cost solution proposals to move from legacy USB2.0 connector to USB Type-C™ connector with STM32 devices

Sunday, December 23rd, 2018

App note from STMicroelectronics about interfacing STM32 legacy USB 2.0 to USB Type-C. Link here (PDF) This application note is a guideline to introduce this USB Type-C connector onto platform to replace legacy USB2.0 connectors. It introduces some basis of the two new standards USB Type-C™ and the USB Power...

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App note: Quad-SPI (QSPI) interface on STM32 microcontrollers

Sunday, December 23rd, 2018

Extend memories by using external high speed memories interfaced to Quad-SPI modules on STM32 micros, app note from STMicroelectronics. Link here (PDF) This application note describes the Quad-SPI interface on the STM32 microcontrollers and explains how to use the module to configure, program, and read external Quad-SPI memories. It describes...

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App note: How to avoid chipLEDs sticking to cover tape during automated tape-and-reel assembly

Sunday, December 16th, 2018

Investigative app note from Vishay on preventing too light components from sticking on the cover tape of their reel. Link here (PDF) Customers have informed Vishay that 0603 LEDs (ChipLEDs) supplied in tape and reel format sometimes stick to the PSA cover tape that is peeled off from the carrier...

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App note: A simple alternative to analog isolation amplifiers

Sunday, December 16th, 2018

A linear isolation amplifier from Silicon Labs app note. Link here (PDF) Analog circuits sometimes require linear (analog) signal isolation for safety, signal level shifting, and/or ground loop elimination. Linear signal isolation is typically difficult to implement, costly, and often exhibits mediocre performance. While the design community thirsts for a...

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App note: BLDC with hall effect sensors using SCT on LPC84x

Sunday, December 9th, 2018

Motor control on LPC84x MCU app note from NXP. Link here (PDF) This application note describes an implementation of brushless DC motor control with hall effect sensors using the SCTimer/PWM on LPC84x.

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App note: Ambient light sensor SFH5701

Sunday, December 9th, 2018

App note from OSRAM on their ALS device SFH5701, its operation and application method. Link here (PDF) The SFH5701 is a small, two-wire, linear output current ambient light sensor (ALS) with current amplifier and dark current compensation. The ALS is capable of resolving a wide range of ambient light levels...

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App note: Low-current charger provides battery backup from USB to 1-cell applications

Sunday, December 2nd, 2018

Another app note from Maxim Integrated on small current battery management. Link here (PDF) The circuit provides a 1-cell Li ion backup battery charger for low-current devices performing resistor limited current sharing

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App note: How to achieve greater accuracy in battery capacity readings for portable designs

Sunday, December 2nd, 2018

App note from Maxim Integrated on using fuel gauge IC to obtain accurate battery state of charge readings. Link here (PDF) Because a product’s runtime is limited by battery capacity, it’s critical to have a precise method for measuring the remaining battery capacity to avoid an unexpected shutdown. This application...

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App note: Single-Channel power supply monitor with remote temperature sense

Sunday, November 25th, 2018

App note from Linear Technology using their LTC2970 to monitor external temperature aside from doing power management. Link here (PDF) Many applications with a single power regulator can benefit from the monitoring and control features of a power supply manager, but most power supply manager ICs have more than one...

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App note: AMR angle sensors

Sunday, November 25th, 2018

Position measurement sensor using magnetoresistive technology discussed in this app note from Analog Devices. Link here (PDF) Anisotropic magnetoresistive (AMR), thin film materials are becoming increasingly important in today’s position sensing technologies. Magnetoresistive (MR) position measurement has many advantages over traditional technologies. Reliability, accuracy, and overall robustness are the primary...

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App note: Overcurrent event detection circuit

Sunday, November 18th, 2018

Sample overcurrent detection circuit from Texas Instruments. Link here (PDF) This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a...

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App note: Active filtering in automotive audio applications

Sunday, November 18th, 2018

App note from Texas Instruments on isolating DC and high frequency noise in audio using their automotive op amps. Link here (PDF) Phone calls, emergency alerts, and music are just a few of the reasons that a high quality audio system is vital in automotive infotainment and clusters. Operational amplifiers...

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App note: Blood pressure monitor fundamentals and design

Sunday, November 11th, 2018

Application note from NXP on blood pressure monitor fundamentals using their medical oriented MCUs. Link here (PDF) Arterial pressure is defined as the hydrostatic pressure exerted by the blood over the arteries as a result of the heart left ventricle contraction. Systolic arterial pressure is the higher blood pressure reached...

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App note: How to eliminate over stress of MOSFET during start-up of flyback converter

Sunday, November 11th, 2018

App note from Richtek about their embedded soft-start function to eliminate MOSFET stress. Link here Switching Power Supply, compared to Linear Power Supply, is widely used due to its advantages, such as small size, light weight, high efficiency, etc. Flyback Converter, one of the switching power supply topologies, is most...

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