App note: RC Snubber for Class-D audio amplifiers

App note from Cirrus about overshoot/ringing suppression in the output stage of Class-D amplifiers using RC Snubber. Link here (PDF) High speed switching of power MOSFETs in the power stage of Class-D amplifiers results in output voltage over/undershoot and high frequency ringing on the output waveform. The over/undershoot places additional stress on the power MOSFETs, […]

App note: General design considerations for MEMS microphones

Proper mounting of miniaturized MEMS from Cirrus Logic application notes. Link here (PDF) This application note offers recommendations in mechanical, PCB land pattern, and solder paste stencil design to deliver the best microphone performance in the final application design.

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

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 naming conventions used within the […]

App note: WM8731 Suggested power-On/Off sequence

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, this is done with some […]

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

  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 to understand Cirrus Logic’s unique […]

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

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 etc. The second operation is […]

App note: An Introduction to MEMS Microphone Specifications

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 create high performance microphones of […]