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App note: The 2-Channel serial audio interface: A tutorial

Sunday, May 1st, 2016

A pretty older application note about the serial audio interface by Cirrus Logic. Link here (PDF) It may come as a surprise to those trying to make their initial investigation into audio systems design that there is a de-facto standard for transferring audio data within a system. Despite the differing...

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App note: The LM4935 headset and push-button detection guide

Sunday, May 1st, 2016

Another headset plug-in detection from Texas Instruments. Link here (PDF) The headset detect circuitry can differentiate between mono, stereo, mono with microphone, and stereo with microphone headsets. It can operate while the LM4935 is placed into low current standby mode, which promotes extended battery life. In standby mode, it consumes...

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App note: Differences between ATmega328/P and ATmega328PB

Sunday, May 1st, 2016

Differences between ATmega328/P and ATmega328PB (PDF!) application note from Atmel: This application note assists the users of Atmel® ATmega328 variants to understand the differences and use Atmel ATmega328PB. ATmega328PB is not a drop-in replacement for ATmega328 variants, but a new device. However, the functions are backward compatible with the existing...

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App note: MSP430 32-kHz crystal oscillators

Sunday, May 1st, 2016

MSP430 32-kHz crystal oscillators (PDF!) application note from Texas Instruments: Selection of the right crystal, correct load circuit, and proper board layout are important for a stable crystal oscillator. This application report summarizes crystal oscillator function and explains the parameters to select the correct crystal for MSP430 ultralow-power operation. In addition, hints and examples...

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App note: Transformers

Sunday, April 24th, 2016

All about transformers and its different uses in this application note from Murata. Link here (PDF)

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App note: Inductors

Sunday, April 24th, 2016

Murata's application note about inductors and its specifications. Link here (PDF) Reading a specification for an inductor is considered a simple task, however, there is often some confusion even over the meaning of relatively straight forward parameters.

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App note: The LED versus LCD decision

Sunday, April 17th, 2016

Choosing between two display types, LED and LCD discussed in this application note from Murata. Link here (PDF) Users of contemporary digital panel meters (DPMs) have a variety of options available to them. While options are nice, they invariably mean more choices have to be made. After determining what meter...

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App note: EFM32 Energy Modes

Sunday, April 17th, 2016

Application note from Silicon Labs on their EFM32 energy saving microcontrollers, some interesting points are discussed how these type of microcontrollers can conserve power. Link here (PDF) In battery powered microcontroller applications, energy saving is essential. By reducing the current consumption, the mean time between battery charging / replacement can be...

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App note: LCD screens don’t flicker – or do they?

Sunday, April 10th, 2016

An old application note from Intersil on comparison of CRT and LCD regarding display flicker. Link here (PDF) When comparing CRT to LCD screens, one of the most popular differences is the issue of flicker. It is a common assumption that CRT screens flicker while LCD screens do not. In...

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App note: Interfacing AT84AD001B dual 8-bit 1 Gsps ADC and AVR ATmega128L

Sunday, April 10th, 2016

e2v's application note interfacing their 1 Gsps 8-bit ADC to AVR. Link here (PDF) With its smart feature (3-wire serial interface), e2v's AT84AD001B dual 8-bit 1 Gsps ADC provides you with digital control over various functions offered with the dual ADC: calibration, gain and offset adjustments, DMUX ratio selection, analog...

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App note: Designing VCNL3020 into an application

Saturday, April 9th, 2016

An app note from Vishay: Designing VCNL3020 into an application (PDF!) The VCNL3020 is a proximity sensor with I2C interface. It combines an infrared emitter, PIN photodiode, and signal processing IC in a single package with a 16 bit ADC. With a range of up to 20 cm (7.9"), this stand-alone,...

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App note: WM8731 Suggested power-On/Off sequence

Sunday, April 3rd, 2016

Interesting app note from Cirrus Logic on how to minimize popping sound on the output when turning on/off the DAC on their WM8731 digital to analog converter. Link here (PDF) As with any consumer audio product, it is important that any on/off power noise be kept to a minimum. Generally,...

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App note: CS3001/2/11/12 & CS3003/4/13/14 Chopper-stabilized Operational Amplifiers

Sunday, April 3rd, 2016

  Cirrus Logic's app note, discussing their own designed chopper amps. Link here (PDF) The chopper-stabilized amplifiers designed at Cirrus Logic are unique. These amplifiers offer performance benefits that combine the best features of bipolar amplifiers with the best features of chopper amplifiers. The intent of this application note is...

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App note: Output buffer options for Si53X/55X/57X/59X XO/VCXO devices

Sunday, April 3rd, 2016

SiLabs' application note: Output buffer options for Si53X/55X/57X/59X XO/VCXO devices (PDF!) The Si53x/55x/57x/59x XO/VCXO devices can be ordered with one of four different output buffer types: CMOS, LVPECL, LVDS, or CML. Each output type has its own particular benefits and disadvantages. This document describes each buffer type, proper biasing and termination schemes, and related...

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App note: WM9712 Jack plug auto-detection, hookswitch detection and microphone headset detection

Sunday, March 27th, 2016

App note on Cirrus Logic's WM9712 jack plug auto-detection by monitoring the connected headphone resistance. Link here (PDF) This application note describes two operations associated with using headset. The first is the facility to automatically switch between a mono ear speaker and stereo headphones for use in a Smartphone, PDA...

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App note: An Introduction to MEMS Microphone Specifications

Sunday, March 27th, 2016

An application note from Cirrus Logic on their MEMS microphones, which are small and perfect for wearables devices. Link here (PDF) MEMS microphones are small form factor microphones, which translate acoustic sound pressure input into an electrical output response. They utilise the silicon wafer processes from the microelectronic industry to...

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App note: Ultrasonic sensing basics for liquid level sensing, flow sensing, and fluid identification applications

Saturday, March 26th, 2016

Here's an app note from Texas Instruments: Ultrasonic sensing basics for liquid level sensing, flow sensing, and fluid identification applications (PDF!) One of the most effective areas of sensor technology is ultrasonic, the science that measures the time interval between an ultrasonic signal that is sent and received, or what is commonly referred to...

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App note: Iris Recognition SFH 4780S

Sunday, March 20th, 2016

This application note from OSRAM describes the use of the SFH 4780S in iris recognition (iris scanning) as illumination module. Link here (PDF) Personal authentication is becoming a key requirement for various electronic devices. Besides of the pin number, today most systems are based on so called biometric “properties”. Biometrics...

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App note: Eye safety of IREDs used in lamp applications

Sunday, March 20th, 2016

This application note from OSRAM describes the possible hazards of infrared LEDs (IREDs) used for lamp applications with respect to the IEC-62471 standard and how to classify IREDs according to different risk groups. Link here (PDF) As the radiated optical power of light emitting diodes (LEDs) has increased in recent...

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App note: Enhancing workplace safety in hazardous locations with PICO® 259-UL913 intrinsically safe fuse

Sunday, March 13th, 2016

Application note from Littelfuse about their (IS) intrinsically safe fuse which doesn't produce sufficient heat that could trigger sparks which are dangerous in an explosive environment. Link here (PDF) Gases, petroleum products, and airborne dusts tend, by their very nature, to be explosive if sources of sparks or excess heat...

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  • Geert Jordaens: I'm not sure what kind of licensing I have to add since it is a fairly straight forward implementation of the adaptive Huffman Decoding. For...
  • erich: For anyone interested, I've added some c++ code for adaptive huffman decoding in the git repository.
  • Sjaak: I would add some more protection in the used trigger file (on the serverpilot site) then not using a standard name :) hopefully they use...
  • Pete Castagna: My friend Charlie who worked in synthesizers at a DOD type of place made a modification to this avalanche pulse generator that allowed him to...
  • Sam Catchpole: Yes please :D