Tag Archives: application note

App note: Practical considerations of Trench MOSFET stability when operating in linear mode

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Practical considerations of Trench MOSFET stability when operating in linear mode, application note (PDF!) from Fairchild Semiconductor

This application note focuses on the factors affecting the thermal instability condition of a trench MOSFET device in Linear Mode. In particular, it studies the phenomenon when the drain current (Id) focusing process occurs that leads to a localized hot spot to the device. Several devices were tested to failure to determine the degree of damage within the die and to differentiate the failure signatures under diferent test conditions. The practical analysis of the device Forward-Biased Safe Operating Area (FBSOA) performance in Linear Mode is presented. It is evaluated in terms of finding the Zero Temparature Coefficient (ZTC) value of the device based on its Id vs. Vgs performance characteristic curves.

App note: Between the Amplifier and the ADC – Managing filter loss in communications systems

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An application note (PDF!) from TI on optimizing the filter design to minimize the losses:

Filtering plays an essential part in nearly all communications systems. Removing unwanted signals is part of system design to eliminate unwanted noise or distortion. The signal presented to the analog to digital converter should have no spurs or distortion products, especially outside the desired Nyquist band. Noise and distortion spurs that may be safely outside the band of interest may not remain outside of that band after the ADC sampling process folds them around the sampling frequency.
The primary targets for the final analog filter are broadband noise and harmonic distortion spurs. Broadband noise, in particular, can be problematic since the bandwidth of many ADCs is typically several times the bandwidth of the signals to be processed. Likewise, harmonic spurs from the upper end of the band of interest are typically still within the input bandwidth of the ADC, even though they are far removed from the signal band. If not filtered out these spurs and noise can fold back onto weaker desired signals
and mask them.

App note: USB field firmware updates on MSP430 MCUs

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TI’s application note: USB field firmware updates on MSP430 MCUs (PDF!)

With the advent of USB, end users can perform firmware upgrades in the field by simply attaching the device via USB and executing an application on the host PC. Such an approach has numerous advantages:

  • Problems discovered after product release can be fixed.
  • Reduced need for high-touch support, because problems can often be solved by instructing the user to upgrade firmware.
  • End users have a more positive experience with the product.
  • Product returns can be reduced.

The USB solution for MSP430™ microcontrollers has been designed to make this process simple and straightforward. The device contains a USB-based on-chip bootstrap loader, and TI provides a Windows source project for downloading firmware that can be quickly customized. This source can be built with Visual C++ 2008 Express, available from Microsoft at no cost. For the USB support software for MSP430 MCUs, see the MSP430 USB Developers Package (MSP430USBDEVPACK).

App note Quick-Start: Driving 14-segment displays with the MAX6954

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Guidelines from Maxim on using the MAX6954 to drive 14-segment monocolor LEDs, app note here (PDF!):

This article is how-to guide, intended as a quick learning aid for engineers considering using the MAX6954 to drive 14-segment monocolor LEDs.

The MAX6954 is a versatile display driver, capable of controlling a mix of discrete, 7-segment, 14-segment, and 16-segment LED displays through a serial interface. This application note shows a typical application and configuration for driving eight mono-color, 14-segment LEDs.
See the MAX6954 data sheet for additional information about MAX6954 features.